Anestesia multimodal intratecal en cesáreas, cambios que mejoran su eficacia y seguridad: ensayo clínico / Intrathecal multimodal anesthesia in caesarean sections, changes that improve its efficacy and safety: clinical trial

Resumen: Introducción: la concentración y velocidad en la administración de la anestesia multimodal intratecal con fentanilo en cesáreas mejoran la eficacia anestésica manteniendo buen control hemodinámico. Objetivo: evaluar si algunos cambios en la anestesia multimodal intratecal mejoran su eficacia y seguridad en cesáreas. Material y métodos: ensayo clínico, controlado, aleatorizado, doble ciego en mujeres embarazadas programadas para cesárea, distribuidas en tres grupos: grupo F6B2: fentanilo 65 μg + bupivacaína hiperbárica 2.5 mg + morfina 10 μg + dexmedetomidina 5 μg; grupo F6B3: fentanilo 60 μg + bupivacaína hiperbárica 3 mg+ morfina 100 μg+ dexmedetomidina 5 μg; y grupo F7B2: fentanilo 70 μg + bupivacaína hiperbárica 2 mg + morfina 100 μg + dexmedetomidina 5 μg. Se evaluó la eficacia anestésica previo a la incisión, durante la disección de la pared abdominal, al ingreso a cavidad abdominal, en la revisión de correderas parietocólicas y en el postquirúrgico inmediato, así como los signos vitales. Resultados: los grupos F6B2 y F6B3 resultaron tener mayor eficacia anestésica en la revisión de correderas parietocólicas (p = 0.02) y el grupo F7B2 el de mayor seguridad con mejor control hemodinámico a los minutos 1 y 10 (p = 0.03 y p = 0.03 respectivamente). Conclusiones: los cambios en la administración de la anestesia multimodal intratecal con fentanilo mejoraron la eficacia anestésica, pero disminuyen la seguridad sobre el control hemodinámico.

Abstract: Introduction: the concentration and speed in the administration of intrathecal multimodal anesthesia with fentanyl in cesareans section improve anesthetic efficacy while maintaining good hemodynamic control. Objective: to evaluate if some changes in intrathecal multimodal anesthesia improve its efficacy and safety in cesareans section. Material and methods: clinical trial, controlled, randomized, double blind; in pregnant women scheduled for cesarean section, divided into 3 groups: group F6B2: fentanyl 65 μg + hyperbaric bupivacaine 2.5 mg+ morphine 100 μg+ dexmedetomidine 5 μg; group F6B3: fentanyl 60 μg + hyperbaric bupivacaine 3 mg + morphine 100 μg + dexmedetomidine 5 μg; and group F7B2: fentanyl 70 μg + hyperbaric bupivacaine 2 mg + morphine 100 μg + dexmedetomidine 5 μg. The anesthetic efficacy was evaluated prior to the incision, during the dissection of the abdominal wall, upon the admission to the abdominal cavity, in the review of paracolic slides and in the immediate postoperative period, as well as the vital signs. Results: the F6B2 and F6B3 groups turned out to have greater anesthetic efficacy in the revision of paracolic slides (p = 0.02) and the F7B2 group had the highest safety with better hemodynamic control at 1 and 10 minutes (p = 0.03 and p = 0.03, respectively). Conclusions: changes in the administration of intrathecal multimodal anesthesia with fentanyl improved anesthetic efficacy, but decreased safety over hemodynamyc control.

Qualitative Histologic Assessment vs. Geomorphometric Analysis of Nerve Fiber Shape after the Intraneural Application of Liposomal Bupivacaine / Evaluación Histológica Cualitativa Versus Análisis Geomorfométrico de la Forma de la Fibra Nerviosa Después de la Aplicación Intraneural de Bupivacaína Liposomal

SUMMARY: The preserved form of all components of the nerve fiber is a prerequisite for the proper conduction of the nerve impulse. various factors can change the shape of nerve fibers. In everyday practice, qualitative histological analysis is the gold standard for detecting changes in shape. Geometric morphometry is an innovative method that objectively enables the assessment of changes in nerve fibers' shape after local anesthetics action. A total of sixty sciatic nerves were used as material, which was intraneural injected with saline solution in the control group (n=30), and a solution of 1.33 % liposomal bupivacaine (n=30) in the test group. After the animals were sacrificed, nerve samples were taken and histological preparations were made. The preparations were first described and examined using a qualitative histological method, after which digital images were made. The images were entered into the MorphoJ program and processed using the method of geometric morphometry. Qualitative histological examination revealed no differences in nerve fibers after intraneurally applied physiological solution and liposomal bupivacaine. Using the method of geometric morphometry, a statistically significant change in the shape of axons was found after intraneurally applied saline solution and liposomal bupivacaine (p=0.0059). No significant differences in histological changes were found after the qualitative histological analysis of nerve fiber cross-section preparations. A statistically significant change in the shape of nerve fiber axons was observed after geometric morphometric analysis of digital images after intraneural application of saline and liposomal bupivacaine.

La forma conservada de todos los componentes de la fibra nerviosa es un requisito previo para la conducción correcta del impulso nervioso. Varios factores pueden cambiar la forma de las fibras nerviosas. En la práctica diaria, el análisis histológico cualitativo es el estándar de oro para detectar cambios de forma. La morfometría geométrica es un método innovador que permite evaluar objetivamente los cambios en la forma de las fibras nerviosas después de la acción de los anestésicos locales. Se utilizó como material un total de sesenta nervios ciáticos, que se inyectaron intraneuralmente con solución salina en el grupo control (n=30), y una solución de bupivacaína liposomal al 1,33 % (n=30) en el grupo de prueba. Después de sacrificados los animales, se tomaron muestras de nervios y se realizaron preparaciones histológicas. Primero se describieron y examinaron las preparaciones utilizando un método histológico cualitativo, después de lo cual se tomaron imágenes digitales. Las imágenes fueron ingresadas al programa MorphoJ y procesadas mediante el método de morfometría geométrica. El examen histológico cualitativo no reveló diferencias en las fibras nerviosas después de la aplicación intraneural de solución fisiológica y bupivacaína liposomal. Usando el método de morfometría geométrica, se encontró un cambio estadísticamente significativo en la forma de los axones después de la aplicación intraneural de solución salina y bupivacaína liposomal (p = 0,0059). No se encontraron diferencias significativas en los cambios histológicos después del análisis histológico cualitativo de las preparaciones de secciones transversales de fibras nerviosas. Se observó un cambio estadísticamente significativo en la forma de los axones de las fibras nerviosas después del análisis de morfometría geométrica de imágenes digitales después de la aplicación intraneural de solución salina y bupivacaína liposomal.

Descripción de analgesia de parto con lidocaína o bupivacaina y Apgar al nacer. Estudio observacional descriptivo retrospectivo

El trabajo de parto lleva con este la experiencia que causa uno de los dolores más intensos que se han descrito. En el Instituto de Seguridad Social de El Salvador (ISSS) se registran aproximadamente 600 a 700 partos vaginales por mes y de estos aproximadamente 10-20% solicitan analgesia para trabajo de parto, la cual el servicio de anestesia provee a través del abordaje epidural. Es conocido que se considera que el medicamento ideal para la analgesia de trabajo de parto es la bupivacaína o lidocaína 3, sin embargo, es de especial importancia describir el puntaje de APGAR de los recién nacidos de madres que recibieron cualquiera de estos dos fármacos por la vía ya mencionada. Objetivo: Determinar cómo influye el uso de lidocaína y bupivacaína como anestésico epidural sobre el puntaje APGAR posterior al nacimiento en mujeres embarazadas en fase activa del trabajo de parto con necesidad de analgesia epidural. Métodos: El presente es un estudio observacional descriptivo retrospectivo de fuentes primarias. El servicio de anestesiología del Hospital Materno Infantil Primero de Mayo cuenta con un registro sobre cuántos y a cuáles pacientes se les administra analgesia epidural por lo que el equipo investigador realizó una revisión de la técnica anestésica y se describe el Apgar al final del parto por vía vaginal en aquellas pacientes que recibieron analgesia epidural con lidocaína o bupivacaína. Se realizó el filtrado con la base de datos de Excel utilizando criterios de inclusión y exclusión, logrando incluir finalmente 81 pacientes en el análisis de los datos. Se encontró durante el escrutinio de estos que a 25 de estas se les realizó cesárea de emergencia y en 6 de estos mismos expedientes no se consignó de manera completa todos los datos necesarios para el análisis de ello, por lo que se utilizaron finalmente 51 expedientes clínicos para la realización de la presente investigación. Resultados: El APGAR promedio de los pacientes que recibieron analgesia de trabajo de parto con bupivacaína es de 8.75 y 8.9 al minuto y cinco minutos respectivamente y el promedio de APGAR alcanzado por los recién nacidos de pacientes que recibieron analgesia de trabajo de parto con lidocaína es de 9 puntos al minuto y cinco minutos. Conclusión: El promedio de APGAR en pacientes que recibieron bupivacaína es de 8.75 y el de lidocaína es de 9. (provisto por Infomedic International)

Labor brings with it the experience that causes one of the most intense pains ever described. At the Social Security Institute of El Salvador (ISSS) approximately 600 to 700 vaginal deliveries are registered per month and of these approximately 10-20% request labor analgesia, which the anesthesia service provides through the epidural approach. It is known that the ideal drug for labor analgesia is considered to be bupivacaine or lidocaine 3, however, it is of special importance to describe the APGAR score of newborns born to mothers who received either of these two drugs by the aforementioned route. Objective: To determine how the use of lidocaine and bupivacaine as epidural anesthetic influences the post-birth APGAR score in pregnant women in the active phase of labor requiring epidural analgesia. Methods: The present is a retrospective descriptive observational observational study from primary sources. The anesthesiology service of the Hospital Materno Infantil Primero de Mayo has a record of how many and to which patients epidural analgesia is administered, so the research team conducted a review of the anesthetic technique and described the Apgar at the end of vaginal delivery in those patients who received epidural analgesia with lidocaine or bupivacaine. Filtering was performed with the Excel database using inclusion and exclusion criteria, finally including 81 patients in the data analysis. It was found during the scrutiny of these that 25 of them had undergone emergency cesarean section and in 6 of these same records not all the data necessary for the analysis were completely recorded, so that 51 clinical records were finally used for the present investigation. Results: The average APGAR of the patients who received labor analgesia with bupivacaine was 8.75 and 8.9 at one minute and five minutes respectively, and the average APGAR achieved by the newborns of patients who received labor analgesia with lidocaine was 9 points at one minute and five minutes. Conclusion: The average APGAR in patients who received bupivacaine is 8.75 and that of lidocaine is 9. (provided by Infomedic International)

Anestesia raquídea con bupivacaína isobárica en cesáreas / Spinal anesthesia with isobaric bupivacaine in cesarean sections

En la anestesia para las cesáreas, la anestesia raquídea con bupivacaína hiperbárica constituye la elección habitual en nuestro medio. Existen dos formas de bupivacaína disponibles, la isobárica (BI) y la hiperbárica (BH). La utilización de la BI es poco frecuente por lo que es relevante conocer la experiencia en su utilización para las anestesias de las cirugías obstétricas. El objetivo del estudio fue caracterizar la utilización de BI en las anestesias raquídeas para cesáreas. Se realizó un estudio observacional, descriptivo, de corte transversal en 23 pacientes que recibieron anestesia espinal con BI. La edad promedio fue de 28  5 años, la dosis promedio de BI utilizada de 9,4 mg. La latencia promedio fue 90 segundos y el tiempo para la instauración una anestesia adecuada fue en promedio 4,9 minutos. En el 82,6% el nivel anestésico alcanzó el dermatoma T4. En el 21,7% fue necesario administrar efedrina para aumentar la presión arterial. En el 52,1% se presentaron efectos adversos menores. A las 24 horas, el dolor fue nulo en 56,5% y leve en 43,5% de los casos. En conclusión, se encontró que las pacientes alcanzaron un nivel sensitivo adecuado en poco tiempo, con una dosis promedio de BI de 9 mg. Pocos pacientes requirieron la administración de un vasopresor para aumentar la presión arterial. Los efectos adversos fueron menores en casi la mitad de los pacientes. En el post operatorio la mayoría de las pacientes no presentaron dolor

In anesthesia for caesarean sections, spinal anesthesia with hyperbaric bupivacaine is the usual choice in our setting. There are two forms of bupivacaine available, isobaric (BI) and hyperbaric (BH). The use of BI is infrequent, so it is relevant to know the experience in its use for anesthesia in obstetric surgeries. The objective of the study was to characterize the use of BI in spinal anesthesia for cesarean sections. An observational, descriptive, cross-sectional study was carried out in 23 patients who received spinal anesthesia with BI. The average age was 28  5 years, the average dose of BI used was 9.4 mg. The average latency was 90 seconds and the time for establishment of adequate anesthesia was on average 4.9 minutes. In 82.6% of the cases, the anesthetic level reached dermatome T4. In 21.7% it was necessary to administer ephedrine to increase blood pressure. Minor adverse effects occurred in 52.1%. At 24 hours, the pain was null in 56.5% and mild in 43.5% of cases. In conclusion, it was found that the patients reached an adequate sensory level in a short time, with an average dose of BI of 9 mg. Few patients required administration of a vasopressor to increase blood pressure. Adverse effects were minor in almost half of the patients. In the postoperative period, most of the patients did not present pain

Anestesia espinal con bupivacaína más morfina en cirugía de urgencia de fractura intertrocantérica de cadera / Spinal anesthesia with bupivacaine plus morphine in urgent intertrochanteric hip fracture surgery

Introducción: La fractura de cadera en el anciano es una entidad frecuente y tiene gran incidencia en el mundo y en Cuba por el envejecimiento. Objetivo: Evaluar la eficacia de la anestesia espinal con bupivacaína más morfina en la cirugía de fractura intertrocantérica de cadera. Métodos: Se realizó un estudio clínico, experimental, no aleatorizado, prospectivo y de corte longitudinal en el Hospital Universitario Faustino Pérez Hernández de Matanzas de octubre de 2017 a octubre de 2019. El universo estuvo conformado por todos los pacientes quirúrgicos con fractura de cadera del hospital. La muestra se realizó por muestreo intencional, por 120 pacientes elegidos a criterio de los investigadores. Grupo control (B): Anestesia subaracnoidea con bupivacaína 0,5 por ciento 10 mg. Grupo estudio (M): Anestesia subaracnoidea con bupivacaína 0,5 por ciento 7 mg más 0,2 mg de morfina. Cada grupo estuvo integrado por 60 pacientes. Las variables analizadas fueron las siguientes: grupos de edades, género, estado físico, nivel de punción, tiempo de inicio del bloqueo motor, hipotensión arterial, uso de vasopresores y complicaciones secundarias a la técnica anestésica. Resultados: Predominó grupo de 84 y 90 años, género femenino y ASA III. La punción lumbar se realizó entre L3-L4. El tiempo de inicio del bloqueo motor fue 1,3 veces menor en el grupo M. Prevaleció la hipotensión arterial en el grupo B; y uso de vasopresores en ambos grupos. Predominó el prurito, grupo M, y la bradicardia, grupo B como complicaciones. Conclusiones: La asociación bupivacaína/morfina en anestesia espinal en adulto mayor para fractura de cadera proporciona mejores resultados sin complicaciones mayores(AU),

Introduction: Hip fracture in the elderly patient is a frequent entity with a high incidence worldwide and in Cuba due to aging. Objective: To assess the efficacy of spinal anesthesia with bupivacaine plus morphine in intertrochanteric hip fracture surgery. Methods: A clinical, experimental, nonrandomized, prospective, prospective and longitudinal study was carried out in Faustino Pérez Hernández University Hospital of Matanzas, from October 2017 to October 2019. The universe consisted of all surgical patients with hip fracture attended in the hospital. The sample was made by purposive sampling, consisting of 120 patients chosen at the discretion of the researchers. The control group (B) was administered subarachnoid anesthesia with 10 mg of bupivacaine 0.5 percent. The study group (M) was administered subarachnoid anesthesia with 7 mg of bupivacaine 0.5 percent. plus 0.2 mg of morphine. Each group consisted of 60 patients. The following variables were analyzed: age groups, gender, physical condition, puncture level, motor block onset time, arterial hypotension, use of vasopressors, and complications secondary to the anesthetic technique. Results: The predominant age group was 84 and 90 years old, together with female gender and ASA III. Lumbar puncture was performed between L3 and L4. The motor block onset time was 1.3 times shorter in the M group. Arterial hypotension prevailed in the B group; apart from the use of vasopressors in both groups. As complications, there was a predominance of pruritus in the M group and bradycardia in the B group. Conclusions: The association bupivacaine/morphine in spinal anesthesia for hip fracture among elderly adults provides better outcomes without major complications(AU)

Tratamiento farmacológico del estrabismo / Pharmacological treatment of strabismus

La cirugía de la musculatura extraocular ha sido el estándar de atención para tratamiento quirúrgico del estrabismo por más de un siglo. A pesar del gran desarrollo técnico de la cirugía de estrabismo en la actualidad, la utilización de microscopio quirúrgico, el diseño novedoso del instrumental quirúrgico, la calidad de la sutura no reabsorbible; los avances en equipamiento y fármacos anestésicos, la misma no está exenta de complicaciones quirúrgicas, además del tiempo de recuperación que necesita el paciente para reincorporarse a sus actividades sociales, han propiciado una búsqueda permanente del tratamiento farmacológico para el estrabismo. El objetivo de esta revisión bibliográfica es analizar las distintas alternativas farmacológicas disponibles como tratamiento del estrabismo. Para su confección se consultó textos completos y artículos en idiomas español e inglés, disponible en algunas bases de datos. Concluimos que aunque se han estudiado numerosos fármacos, la toxina botulínica que es la más conocida y utilizada mundialmente, seguida de la bupivacaína. Encontramos otros como la IGF I y II (Insuline Growing Factor), capaces de generar un efecto de reforzamiento de la actividad muscular. Y otros que "debilitan" la musculatura extraocular, incluyen la mAb35-Rubicina, BMP4 (Proteína morfogénica ósea). Se continúa su investigación en la actualidad(AU)

Extraocular musculature surgery has been the standard of care for surgical treatment of strabismus for more than a century. Despite the great technical development of strabismus surgery today, the use of a surgical microscope, the novel design of surgical instruments, the quality of the non-absorbable suture; Advances in anesthetic equipment and drugs, it is not exempt from surgical complications, in addition to the recovery time that the patient needs to return to their social activities, have led to a permanent search for pharmacological treatment for strabismus. The objective of this bibliographic review is to analyze the different pharmacological alternatives available as a treatment for strabismus. For its preparation, full texts and articles in Spanish and English languages were consulted, available in some databases. We conclude that although numerous drugs have been studied, botulinum toxin, which is the best known and used worldwide, followed by bupivacaine. We find others such as IGF I and II (Insuline Growing Factor), capable of generating an effect of reinforcing muscle activity. And others that "weaken" MOE include mAb35-Rubicin, BMP4 (Bone Morphogenic Protein). His research is continuing today(AU)

Infiltração de anestésicos locais na ferida cirúrgica: efeito sobre a inflamação e cicatriz fibrosa em ratos / Infiltration of local anesthetics into the surgical wound: effect on inflammation and fibrous scar in rats

■ RESUMO Introdução: O alívio da dor após a cirurgia continua sendo um dos desafios médicos mais significativos, principalmente na cirurgia estética. A infiltração da incisão cirúrgica com anestésicos locais tem sido cada vez mais utilizada para reduzir a dor e o uso de analgésicos. No entanto, pouco se sabe sobre o efeito desta injeção na cicatrização. O objetivo é avaliar a interferência dos anestésicos locais na área de infiltrado inflamatório e cicatriz de fibrose em ratos. Métodos: Duas incisões lineares foram feitas cada uma na região dorsal de 40 ratos Wistar. A incisão esquerda foi infiltrada com doses de 1,8ml de bupivacaína, levobupivacaína, ropivacaína ou solução salina 0,9%. A incisão direita não recebeu infiltração, servindo como grupo controle. Após sete dias, amostras das incisões foram coletadas para avaliação morfométrica histológica. Resultados: Quando comparada com os grupos controle, a área de infiltrado inflamatório encontrada foi maior nos grupos bupivacaína, ropivacaína e levobupivacaína. O grupo bupivacaína apresentou um infiltrado inflamatório maior do que a levobupivacaína e a ropivacaína. A área da cicatriz fibrosa foi maior nos grupos levobupivacaína e ropivacaína. Não houve diferença entre os grupos que receberam anestésico e solução salina. Conclusão: Como não houve diferença entre os grupos de anestésico e soro fisiológico, o volume aplicado ou o trauma podem ter sido a causa das maiores áreas de infiltração e cicatriz associadas à aplicação dos anestésicos locais.

■ ABSTRACT Introduction: Pain relief after surgery remains one of the most significant medical challenges, mainly in aesthetic surgery. The infiltration of the surgical incision with local anesthetics has been increasingly used to reduce pain and other analgesic use. However, little is known about the effect of this injection on healing. The objective is to evaluate the interference of local anesthetics in the area of inflammatory infiltrate and fibrosis scar in rats. Methods: Two linear incisions each were made on the dorsal region of 40 Wistar rats. The left incision was infiltrated with doses of 1.8ml of bupivacaine, levobupivacaine, ropivacaine, or 0,9% saline solution infiltration. The right incision did not receive infiltration, serving as a control group. After seven days, samples of the incisions were collected for histological morphometric evaluation. Results: When compared with the control groups, the area of inflammatory infiltrate was found larger in the bupivacaine, ropivacaine, and levobupivacaine groups. The bupivacaine group presented a larger inflammatory infiltrate than the levobupivacaine and ropivacaine. The fibrous scar area was larger in the levobupivacaine and ropivacaine groups. There was no difference between the groups that received anesthetic and saline solution. Conclusion: As there was no difference between the anesthetics and saline solution groups, the volume applied, or the trauma may have been the cause of the larger areas of infiltrating and scar associated with local anesthetics application.

Analgesia posoperatoria en la videolaparascopía de urgencia mediante irrigación de bupivacaína intraperitoneal / Posoperative analgesia in emergency videolaparoscopy through intraperitoneal bupivacaine irrigation

Introducción: La videolaparascopía es un procedimiento frecuente en los servicios de urgencias de cirugía general. El dolor agudo después de estas intervenciones es de naturaleza compleja y requiere un tratamiento analgésico efectivo. Objetivo: Determinar la utilidad del empleo de bupivacaína intraperitoneal en el alivio del dolor posoperatorio en la videolaparascopía de urgencia. Métodos: Se realizó un estudio longitudinal prospectivo y analítico en 80 pacientes mayores de 18 años, anunciados para videolaparoscopía bajo anestesia general orotraqueal en el servicio de urgencias del HMC: Dr. Luis Díaz Soto, desde septiembre de 2016 hasta septiembre de 2018. Los pacientes fueron divididos aleatoriamente en dos grupos de 40 cada uno. Al grupo 1 se aplicó lidocaína transdérmica preincisional en las incisiones de piel y, al término de la cirugía, se irrigaron ambos hemidiafragmas con bupivacaína al 0,25 por ciento. Al grupo 2 se le administró dosis preincisional de analgésicos endovenosos solamente. Resultados: Predominó significativamente el sexo femenino sin diferencia entre grupos. La analgesia posoperatoria fue mejor en el grupo 1 estadísticamente significativa a las 4, 8 y 12 horas. Los requerimientos de analgesia de rescate fueron menores en el grupo 1 (p=0,0024). No se reportaron efectos adversos. Conclusiones: La administración de lidocaína transdérmica preincisional y la instilación de bupivacaína intraperitoneal al final de la videolaparoscopía de urgencia, reduce significativamente el dolor en las primeras horas de posoperatorio. Su aplicación es sencilla, fácil y segura sin evidencias de efectos adversos(AU)

Introduction: Videolaparoscopy is a frequent general surgery procedure in emergency services. Acute pain after these interventions is complex in nature and requires effective analgesic treatment. Objective: To determine the usefulness of intraperitoneal bupivacaine in the relief of postoperative pain in emergency videolaparoscopy. Methods: A prospective, analytical and longitudinal study was carried out in eighty patients older than eighteen years old, announced for videolaparoscopy under orotracheal general anesthesia in the emergency department of Hospital Militar Central Dr. Luis Díaz Soto, from September 2016 to September 2018. The patients were randomly divided into two groups of forty individuals each. Group 1 was applied pre-incisional transdermal lidocaine on skin incisions and, at the end of surgery, both hemidiaphragms were irrigated with bupivacaine 0.25 percent. Group 2 received pre-incisional doses of intravenous analgesics only. Results: The female sex predominated significantly, without difference between the two groups. Postoperative analgesia was better in group 1, insofar it was statistically significant at four, eight and twelve hours. Rescue analgesia requirements were lower in group 1 (p=0.0024). No adverse effects were reported. Conclusions: The administration of pre-incisional transdermal lidocaine and the instillation of intraperitoneal bupivacaine at the end of emergency videolaparoscopy significantly reduces pain during the first hours after surgery. Its application is simple, easy and safe, without evidence of adverse effects(AU)

Síndrome de cauda equina posterior a la administración por vía subaracnoidea de bupivacaina hiperbárica al 0, 75 % / Cauda equina syndrome following subarachnoid administration of hyperbaric bupivacaine 0. 75 %

El síndrome de cauda equina es una patología poco frecuente en el área de anestesiología. Esta se caracteriza por presentar un conjunto de signos y síntomas que involucran: dolor, disminución o abolición de la fuerza muscular, disfunción de esfínteres e hipoestesia de silla de montar. El objetivo del presente trabajo es presentar y discutir el caso clínico de una paciente con diagnóstico de síndrome de cauda equina posterior a la administración por vía subaracnoidea de bupivacaina al 0,75 % hiperbárica. Se trata de paciente femenina de 42 años a quien se le realizó cesárea segmentaria y salpingectomia bilateral con bloqueo anestésico subaracnoideo; y quien posteriormente a las dieciséis horas del posoperatorio presentó: disminución de la fuerza muscular de miembros inferiores e hipoestesia de región de silla de montar, reflejo rotuliano: 0/4 bilateral y retención urinaria. Se le inicia tratamiento farmacológico y fisiátrico inmediatamente establecido el diagnóstico de síndrome de cauda equina. La paciente fue dada de alta el día diez del posoperatorio, con disminución significativa de la clínica antes descrita, evidenciándose posteriormente retención urinaria por lo que requirió sondaje vesical intermitente. Una vez establecido el diagnostico se instaló inmediatamente tratamiento farmacológico y fisiátrico para dar una oportuna resolución de la patología(AU)

Cauda equina syndrome is a rare pathology in the area of anesthesiology. This is characterized by presenting a set of signs and symptoms that involve: pain, decrease or abolition of muscle strength, sphincter dysfunction and saddle hypoesthesia. The objective of this work is to present and discuss the clinical case of a patient with a diagnosis of cauda equina syndrome after the administration of hyperbaric 0.75% bupivacaine via the subarachnoid route. This is a 42-year-old female patient who underwent segmental cesarean section and bilateral salpingectomy with subarachnoid anesthetic block; and who subsequently at sixteen hours postoperatively presented: decreased muscle strength, lower limbs and hypoesthesia of the saddle region, knee jerk reflex: bilateral 0/4 and urinary retention. Pharmacological and physical treatment was started immediately, the diagnosis of cauda equina syndrome was established. The patient was discharged on postoperative day 10, with a significant decrease in the symptoms described above, later evidence of urinary retention, requiring intermittent bladder catheterization. Once the diagnosis was established, pharmacological and physiatric treatment was immediately installed to give a timely resolution of the pathology(AU)

Bupivacaine-induced myotoxicity during a continuous perineural femoral block: case report / Miotoxicidad inducida por bupivacaína durante un bloqueo continuo del nervio femoral: reporte de caso

Abstract Introduction: Regional anesthesia is widely used for postopera tive analgesia in total knee arthroplasty (TKA). Although it is a safe and effective procedure, serious complications may still develop. In the event of an unusual or torpid evolution, the possibility of local anesthetic-induced myotoxicity should be suspected. Case presentation: A 54-year old patient, American Society of Anesthesiologists (ASA) II, underwent TKA due to primary gonarthrosis.. The analgesic technique used was a femoral nerve block associated with continuous perineural infusion. 24 hours later, the patient's medical condition deteriorated presenting pain, edema, and functional limitation of the thigh of the operated extremity. The symptoms were suggestive of myotoxicity, confirmed with diagnostic images leading to the removal of the catheter. The patient experienced then a significant improvement and was discharged 5 days after surgery. Conclusion: The diagnosis of myotoxicity from local anes thetics is rare, since its manifestations may be masked by the usual symptoms of the postoperative period. Early identification of the condition is fundamental to reduce its negative impact on the patient's recovery and satisfaction. Since the scope of the damage depends particularly on the concentration and duration of the exposure to the local anesthetic agent, there is a need to implement protocols that enable an effective block with the lowest concentration and volume of the medication.

Resumen Introducción: La anestesia regional es ampliamente usada para la analgesia posoperatoria en la Artroplastia de Reemplazo de Rodilla (ARR). Aunque son procedimientos seguros y efectivos, la posibilidad de complicaciones graves existe. Ante una evolución inusual o tórpida se debe sospechar la posibilidad de miotoxicidad inducida por anestésicos locales. Presentación del caso: En un paciente de 54 años, American Society of Anesthesiologists (ASA) II, se llevó a cabo ARR por gonartrosis primaria. Como técnica analgésica se usó el bloqueo de nervio femoral asociado a infusión continua perineural. 24 horas después el paciente presenta deterioro clínico dado por dolor, edema y limitación funcional en muslo de extremidad operada. Ante síntomas sugestivos de miotoxicidad confirmada por imágenes diagnósticas, el catéter fue retirado. Posteriormente, presentó una mejoría significa tiva y egresó del hospital al quinto día posoperatorio. Conclusiones: El diagnóstico de miotoxicidad por anestésicos locales es poco frecuente debido a que sus manifestaciones pueden estar enmascaradas por los síntomas habituales durante el periodo posoperatorio. Su identificación temprana es funda mental para disminuir el efecto negativo sobre la recuperación y la satisfacción del paciente. Dado que la magnitud del daño depende especialmente de la concentración y la duración de la exposición al anestésico local, es necesario implementar proto colos que permitan lograr un bloqueo efectivo con la menor concentración y volumen posible del medicamento.

Antimicrobial effects of fentanyl and bupivacaine: an in vitro study / Efeitos antimicrobianos do fentanil e da bupivacaína: estudo in vitro

Abstract Study objective: In this study, we aimed to compare the antimicrobial effects of bupivacaine and fentanyl citrate and to reveal the impact on antimicrobial effect potential in the case of combined use. Design: In vitro prospective study. Setting: University Clinical Microbiology Laboratory. Measurements: In our study, in vitro antimicrobial effect of 0.05 mg.mL-1 fentanyl citrate, 5 mg.mL-1 bupivacaine were tested against Staphylococcus aureus American Type Culture Collection (ATCC) 29213, Pseudomonas aeruginosa ATCC 27853, Klebsiella pneumoniae ATCC 13883, Escherichia coli ATCC 25922 and Candida albicans ATCC 10231 as Group F (Fentanyl Citrate) and Group B (Bupivacaine), respectively. S. aureus ATCC 29213, P. aeruginosa ATCC 27853, Klebsiella pneumoniae ATCC 13883 and Escherichia coli ATCC 25922 were cultured onto Mueller Hinton agar (Oxoid, UK) plates and Candida albicans ATCC 10231 were cultured onto Sabouraud dextrose agar (Oxoid, UK) plates for 18-24 hours at 37 °C. Main results: In terms of inhibition zone diameters, S. Aureus ATCC 29213, P. aeruginosa ATCC 27853, and C. albicans ATCC10231 values obtained after 12 and 24 hours of incubation ​​were significantly higher in Group F than Group B (p < 0.001). In terms of inhibition zone diameters, E. coli ATCC 25922, and K. pneumomiae ATCC 13883 values obtained after 12 and 24 hours of incubation ​​were significantly higher in Group B than Group F (p < 0.001, E. coli 12ª hour p = 0.005). Conclusions: Addition of fentanyl to Local Anesthetics (LAs) is often preferred in regional anesthesia applications in today's practice owing especially to its effect on decreasing the local anesthetic dose and increasing analgesia quality and patient satisfaction. However, when the fact that fentanyl antagonized the antimicrobial effects of LAs in the studies is taken into account, it might be though that it contributes to an increase in infection complications. When the fact that fentanyl citrate which was used in our study and included hydrochloric acid and sodium hydroxide as protective agents, broadened the antimicrobial effect spectrum of LAs, had no antagonistic effect and showed a synergistic antimicrobial effect against E. Coli is considered, we are of the opinion that the addition of fentanyl to LAs would contribute significantly in preventing the increasing regional anesthesia infection complications.

Resumo Objetivo: O objetivo do presente estudo foi comparar os efeitos antimicrobianos da bupivacaína e citrato de fentanil e revelar o impacto no potencial do efeito antimicrobiano no caso de uso combinado. Desenho: Estudo prospectivo in vitro. Local: Laboratório de Microbiologia Clínica da Universidade. Medidas: Em nosso estudo, os efeitos antimicrobianos in vitro do citrato de fentanil na concentração de 0,05 mg.mL-1 - Grupo F e da bupivacaína na concentração de 5 mg.mL-1 - Grupo B foram testados em culturas de Staphylococcus aureus ATCC 29213 (do inglês American Type Culture Collection 29213), Pseudomonas aeruginosa ATCC 27853, Klebsiella pneumoniae ATCC 13883, Escherichia coli ATCC 25922 e Candida albicans ATCC 10231. As culturas de S. aureus ATCC 29213, P. aeruginosa ATCC 27853, Klebsiella pneumoniae ATCC 13883 e Escherichia coli ATCC 25922 foram semeadas em placas de ágar Mueller Hinton (Oxoid, Reino Unido), e a cultura de Candida albicans ATCC 10231 foi realizada em placa de ágar Sabouraud dextrose (Oxoid, Reino Unido) durante 18-24 horas a 37 °C. Principais resultados: Com relação ao diâmetro da zona de inibição, os valores de S. aureus ATCC 29213, P. aeruginosa ATCC 27853 e C. albicans ATCC10231 obtidos após 12 e 24 horas de incubação foram significantemente maiores no Grupo F do que no Grupo B (p < 0,001). Os valores do diâmetro da zona de inibição das culturas de E. coli ATCC 25922 e K. pneumomiae ATCC 13883 obtidos após 12 e 24 horas de incubação foram significantemente maiores no Grupo B do que no Grupo F (p < 0,001, E. coli na 12ª hora p = 0,005) Conclusões: A preferência atual e frequente pela adição de fentanil aos Anestésicos Locais (AL) para a realização de anestesia regional se deve sobretudo à possibilidade de redução da dose do anestésico local, a melhora na qualidade da analgesia e a satisfação do paciente. No entanto, ao considerar estudos em que o fentanil antagonizou o efeito antimicrobiano dos AL, pode-se pensar que esse fato contribua para aumento de complicação infecciosa. O citrato de fentanil usado em nosso estudo, contendo ácido clorídrico e hidróxido de sódio como agentes conservantes, ampliou o espectro de efeitos antimicrobianos dos AL, não teve efeito antagônico e demonstrou efeito antimicrobiano sinérgico contra a E. coli. Acreditamos que a adição de fentanil aos anestésicos locais traria importante contribuição na prevenção das crescentes complicações por infecção da anestesia regional.

Bupivacaine injection for comitant horizontal strabismus: clinical and radiological results / Injeção de bupivacaína para estrabismo comitante horizontal: resultados clínicos e radiológicos

ABSTRACT Purpose: To report the outcomes of bupivacaine injection for the treatment of comitant horizontal strabismus and evaluate clinical effectiveness and associated radiological changes. Methods: This prospective observational clinical study was conducted on 10 patients with comitant horizontal strabismus of up to 40 prism diopters. Ophthalmologic examinations and three-dimensional orbital magnetic resonance imaging were performed pre and post-injection (at first, third, and 12th months). A 4.5 ml of 0.5% bupivacaine was injected into the extraocular muscle under topical anesthesia using an electromyography in all patients. Results: The mean follow-up time at post bupivacaine injection and mean deviation at primary position were was 17 ± 2 months and 21.3 prism diopters, respectively. The mean changes in ocular alignment, enlargement of the cross-sectional area in the injected muscle, and volumetric enlargement were 7.7 PD, 12%, and 17% at the first year post-injection, respectively. No severe or persistent complication was observed. Ptosis and mydriasis were noted post-injection due to the anesthetic effects of bupivacaine but disappeared within 2 h post-injection. Conclusions: Bupivacaine injection improved eye alignment in small-angle horizontal comitant strabismus, effectively diagnosed with orbital magnetic resonance imaging to evaluate volumetric changes of the extraocular muscles. Further clinical studies with larger numbers of patients should be performed to define optimal dosages, concentration, and application method and dose-response relationship.

RESUMO Objetivo: Relatar resultados da injeção de bupivacaína para o tratamento do estrabismo comitante horizontal e avaliar sua eficácia clínica e as alterações radiológicas associadas. Métodos: Este estudo clínico observacional prospectivo foi realizado em 10 pacientes com estrabismo comitante horizontal de até 40 dioptrias de prisma. Exames oftalmológicos e ressonância magnética orbital tridimensional foram realizados pré e pós-injeção (no primeiro, terceiro e 12º mês). A 4,5 mL de bupivacaína a 0,5% foi injetado no músculo extraocular sob anestesia tópica usando eletromiografia em todos os pacientes. Resultados: O tempo médio de acompanhamento pós-injeção de bupivacaína e o desvio médio na posição primária foram de 17 ± 2 meses e 21,3 dioptrias de prisma, respectivamente. As alterações médias no alinhamento ocular, aumento da área da secção transversal no músculo injetado e aumento volumátrico foram de 7,7 PD, 12% e 17% no primeiro ano pós-injeção, respectivamente. Nenhuma complicação grave ou persistente foi observada. Ptose e midríase foram observadas após a injeção devido ao efeito anestésico da bupivacaína, mas desapareceram dentro de duas horas após a injeção. Conclusões: A injeção de bupivacaína melhorou o alinhamento dos olhos no estrabismo comitante horizontal de pequeno ângulo, efetivamente diagnosticado com ressonância magnética orbital para avaliar as alterações volumétricas dos músculos extraoculares. Outros estudos clínicos, com maior número de pacientes devem ser realizados para definir dosagens, concentração, método de aplicação e a relação dose-resposta.

Influence of different local anesthetics on atracurium neuromuscular blockade on rats / Influência de diferentes anestésicos locais no bloqueio neuromuscular produzido pelo atracúrio em ratos

Abstract Introduction: The association between local anesthetics (LA) and neuromuscular blocking (NMB) drugs in clinical practice, and the possibility of interaction between these drugs has been investigated. LAs act on neuromuscular transmission in a dose-dependent manner and may potentiate the effects of NMB drugs. Objective: The aim of this study was to evaluate, in an experimental model, the effect of lidocaine and racemic bupivacaine on neuromuscular transmission and the influence on neuromuscular blockade produced by atracurium. Methods: Male Wistar rats, weighing from 250 to 300 g were used. The preparation was set up based on a technique proposed by Bülbring. Groups were formed (n = 5) according to the drug studied: lidocaine 20 µg.mL−1 (Group I); racemic bupivacaine 5 µg.mL−1 (Group II); atracurium 20 µg.mL−1 (Group III); atracurium 20 µg.mL−1 in a preparation previously exposed to lidocaine 20 µg.mL−1 and racemic bupivacaine 5 µg.mL−1, Groups IV and V, respectively. The following parameters were assessed: 1) Amplitude of hemi diaphragmatic response to indirect stimulation before and 60 minutes after addition of the drugs; 2) Membrane potentials (MP) and miniature endplate potentials (MEPPs). Results: Lidocaine and racemic bupivacaine alone did not alter the amplitude of muscle response. With previous use of lidocaine and racemic bupivacaine, the neuromuscular blockade (%) induced by atracurium was 86.66 ± 12.48 and 100, respectively, with a significant difference (p = 0.003), in comparison to the blockade produced by atracurium alone (55.7 ± 11.22). These drugs did not alter membrane potential. Lidocaine initially increased the frequency of MEPPs, followed by blockade. With the use of bupivacaine, the blockade was progressive. Conclusions: Lidocaine and racemic bupivacaine had a presynaptic effect expressed by alterations in MEPPs, which may explain the interaction and potentiation of NMB produced by atracurium.

Resumo Introdução: A associação de anestésicos locais (AL) com bloqueadores neuromusculares (BNM) na prática clínica e a possibilidade de interação entre esses fármacos têm sido investigadas. Objetivo: Avaliar, em modelo experimental, o efeito da lidocaína e da bupivacaína racêmica na transmissão neuromuscular e sua influência no bloqueio neuromuscular produzido pelo atracúrio. Método: Ratos machos da linhagem Wistar, peso entre 250 e 300 g. A preparação foi feita de acordo com a técnica proposta por Bulbring. Grupos (n = 5) de acordo com o fármaco em estudo: lidocaína 20 µg.mL-1 (Grupo I); bupivacaína racêmica 5 µg.mL-1 (Grupo II); atracúrio 20 µg.mL-1 (Grupo III); atracúrio 20 µg.mL-1 em preparação previamente exposta a lidocaína 20 µg.mL-1 e bupivacaína racêmica 5 µg.mL-1, Grupos IV e V, respectivamente. Foram avaliados: 1) A amplitude das respostas do hemidiafragma à estimulação indireta antes e 60 minutos após a adição dos fármacos; 2) Os potenciais de membrana (PM) e os potenciais de placa terminal em miniatura (PPTM). Resultados: Os AL, isoladamente, não alteraram a amplitude das respostas musculares. Com o uso prévio dos AL, o bloqueio neuromuscular (%) do atracúrio foi 86,66 ± 12,48 e 100, respectivamente, com diferença significante (p= 0,003) em relação ao produzido pelo atracúrio isoladamente (55,7 ± 11,22). Não alteraram o PM. A lidocaína inicialmente aumentou a frequência dos PPTM, seguido de bloqueio; com a bupivacaína, o bloqueio foi progressivo. Conclusão: A lidocaína e a bupivacaína racêmica apresentaram efeito pré-sináptico expresso por alterações nos PPTM, podem justificar a potencialização do bloqueio neuromuscular produzido pelo atracúrio.

Anestesia espinal con morfina y bupivacaína en la cirugía de próstata / Spinal anesthesia with morphine and bupivacaine in prostate surgery

Introducción: El dolor posoperatorio constituye la principal causa de dolor agudo en el mundo. Brindar analgesia adecuada en el posquirúrgico garantiza la disminución de la estadía hospitalaria y tiene un impacto positivo en el resultado final de las intervenciones. Objetivo: Evaluar la efectividad de la analgesia posoperatoria con bupivacaína más morfina intratecal en la cirugía de próstata. Métodos: Se realizó una investigación cuasiexperimental, entre enero de 2015 y enero de 2018. La muestra quedó conformada de manera no probabilística por los pacientes que dieron su consentimiento informado y reunieron criterios para entrar en el estudio. Quedaron distribuidos de manera aleatoria en dos grupos denominados bupivacaína (B) y morfina-bupivacaína (MB). Para recolectar la información se emplearon las historias clínicas anestésicas y un formulario elaborado al efecto. Los resultados se mostraron en tablas y gráficos, se expresaron en frecuencias absolutas y en porcientos, se determinaron algunas medidas descriptivas de interés que mostraron el comportamiento de las variables que lo requirieron. Resultados: El resultado más relevante fue el efecto analgésico muy significativo en el grupo MB en las primeras 24 h del posoperatorio. La reacción adversa más frecuente fue el prurito y solo se presentó en el grupo que recibió morfina. Conclusiones: La anestesia espinal con morfina y bupivacaína es efectiva y segura, proporcionando mejor analgesia en el posoperatorio inmediato cuando se compara con bupivacaína sola(AU)

Introduction: Postoperative pain is the main cause of acute pain worldwide. Providing suitable analgesia in the postoperative period guarantees the reduction of hospital stay and has a positive impact on the final outcome of the interventions. Objective: To evaluate the effectiveness of postoperative analgesia with intrathecal administration of bupivacaine plus morphine in prostate surgery. Methods: A quasiexperimental research was carried out between January 2015 and January 2018. The sample was nonprobabilistic and made up by the patients who gave their informed consent and met criteria to enter the study. They were randomly distributed into two groups called bupivacaine (B) and morphine-bupivacaine (MB). To collect the information, the anesthetic medical records and a form prepared for this purpose were used. The results were shown in tables and graphs, expressed in absolute frequencies and percentages, some descriptive measures of interest were determined which showed the behavior of the variables that required it. Results: The most relevant result was the very significant analgesic effect in the MB group in the first 24 hours after surgery. The most frequent adverse reaction was pruritus and only occurred in the group that received morphine. Conclusions: Spinal anesthesia with morphine and bupivacaine is effective and safe, providing better analgesia in the immediate postoperative period when compared with bupivacaine alone(AU)

Eficacia del fentanilo en anestesia raquídea para el dolor agudo postoperatorio / Efficacy of fentanil in spinal anesthesia for acute postoperative pain

Objetivo: El dolor agudo postoperatorio es un conjunto de percepciones sensoriales, emocionales y mentales desagradables, asociadas a respuestas autonómicas, psicológicas y conductuales, precipitadas por el acto quirúrgico. Objetivo: Generar conocimiento sobre la eficacia del fentanilo en anestesia raquídea para el dolor agudo postoperatorio. Material y métodos: Es un estudio descriptivo de búsqueda bibliografía y se ha realizado en Pubmed, Medline, Scielo, bibliotecas de universidades nacionales e internacionales. Resultados: La asociación de fentanilo a los anestésicos locales para la anestesia subaracnoidea, reduciendo la dosificación de anestésico local y manteniendo el tiempo de su recuperación y así de esta manera mejorar la calidad, la tasa de éxito de pequeñas dosis de los mismos, con ello, la incidencia de complicaciones hemodinámicas. La administración subaracnoidea de anestésicos locales y opioides, provocan eventos adversos, prurito (30 %), náuseas y vómito (25 %), retención urinaria (10-53 %), depresión respiratoria (3 %). Las diferentes dosis de fentanilo asociado a bupivacaína 0.5%, en la raquianestesia disminuyen la intensidad de dolor según EVA, en el trans-operatorio y el manejo del dolor agudo post-operatorio en los diferentes actos quirúrgicos. Conclusión: Se concluye que la asociación de bupivacaína 0,5% más fentanilo, mediante la técnica raquídea, en pacientes intervenidos quirúrgicamente, resulta eficaz, debido a que permite obtener un menor tiempo de latencia para el bloqueo con una duración prolongada, manteniendo una adecuada hemodinamia y estabilidad respiratoria, y también reduciendo el dolor postoperatorio y sus posibles reacciones adversas. (AU)

Introduction: Acute postoperative pain is a set of unpleasant sensory, emotional and mental perceptions associated with autonomic, psychological and behavioral responses precipitated by the surgical act. Objective: Generate knowledge about the efficacy of fentanyl in spinal anesthesia for acute postoperative pain. Material and methods: It is a descriptive study of literature search and has been carried out in Pubmed, Medline, Scielo, libraries of national and international universities. Results: The association of fentanyl with local anesthetics for subarachnoid anesthesia, reduces the dose of local anesthetic, without prolonging the recovery time, improving the quality, the success rate of small doses of them, with this, the incidence of hemodynamic complications. The subarachnoid administration of local anesthetics and opioids, cause adverse events, itching (30%), nausea and vomiting (25%), urinary retention (10-53%), respiratory depression (3%), all this as a result of interactions with opioid receptors at the brain level. The different doses of fentanyl associated with 0.5% bupivacaine, in spinal anesthesia reduce the intensity of pain according to EVA, in the trans-operative period and the management of acute post-operative pain in the different surgical acts. Conclusion: It is concluded that the association of 0.5% bupivacaine plus fentanyl, through the spinal technique, in surgically treated patients, is effective, since it allows to reach a shorter time of onset of the blockade and longer duration of the block, maintaining adequate hemodynamic and respiratory stability, the time it reduces acute post-operative pain and adverse reactions. (AU)

Comparison of fentanyl and dexmedetomidine as an adjuvant to bupivacaine for unilateral spinal anesthesia in lower limb surgery: a randomized trial / Comparação de fentanil e dexmedetomidina como adjuvante à bupivacaína para raquianestesia unilateral em cirurgia de membros inferiores: estudo randômico

Abstract Background and objectives One of the disadvantages of unilateral spinal anesthesia is the short duration of post-operative analgesia, which can be addressed by adding adjuvants to local anesthetics. The aim of current study was to compare the effects of adding dexmedetomidine, fentanyl, or saline to bupivacaine on the properties of unilateral spinal anesthesia in patients undergoing calf surgery. Methods In this double-blind clinical trial, 90 patients who underwent elective calf surgery were randomly divided into three groups. The spinal anesthetic rate in each of the three groups was 1 mL bupivacaine 0.5% (5 mg). In groups BD, BF and BS, 5 µg of dexmedetomidine, 25 µg of fentanyl and 0.5 mL saline were added, respectively. The duration of the motor and sensory blocks in both limbs and the rate of pain during 24 h after surgery were calculated. Hemodynamic changes were also measured during anesthesia for up to 90 min. Results The duration of both of motor and sensory block was significantly longer in dependent limb in the BF (96 and 169 min) and BD (92 and 166 min) groups than the BS (84 and 157 min) group. Visual Analog Scale was significantly lower in the two groups of BF (1.4) and BD (1.3), within 24 h after surgery, than the BS (1.6) group. Conclusions The addition of fentanyl and dexmedetomidine to bupivacaine in unilateral spinal anesthesia can increase the duration of the motor and sensory block in dependent limb and prolong the duration of postoperative pain. However, fentanyl is more effective than dexmedetomidine.

Resumo Justificativa e objetivos Uma das desvantagens da raquianestesia unilateral é a curta duração da analgesia pós-operatória, que pode ser abordada pela adição de adjuvantes aos anestésicos locais. O objetivo deste estudo foi comparar os efeitos da adição de dexmedetomidina, fentanil ou solução salina à bupivacaína sobre as propriedades da raquianestesia unilateral em pacientes submetidos à cirurgia de panturrilha. Métodos Neste ensaio clínico duplo-cego, 90 pacientes submetidos à cirurgia eletiva de panturrilha foram randomicamente divididos em três grupos. A quantidade de anestésico para a raquianestesia nos três grupos foi de 1 mL de bupivacaína a 0,5% (5 mg). Nos grupos BD, BF e BS, 5 µg de dexmedetomidina, 25 µg de fentanil e 0,5 mL de solução salina foram adicionados, respectivamente. Foram calculados a duração dos bloqueios motor e sensorial em ambos os membros e o escore de dor durante 24 horas após a cirurgia. As alterações hemodinâmicas também foram medidas durante a anestesia por até 90 minutos. Resultados A duração de ambos os bloqueios, motor e sensorial, foi significativamente maior no membro dependente nos grupos BF (96 e 169 min) e BD (92 e 166 min) do que no grupo BS (84 e 157 min). Os escores da escala visual analógica foram significativamente menores nos grupos BF (1,4) e BD (1,3) do que no grupo BS (1,6) nas 24 horas após a cirurgia. Conclusões A adição de fentanil e dexmedetomidina à bupivacaína em raquianestesia unilateral pode aumentar a duração dos bloqueios sensorial e motor no membro dependente e prolongar a duração da dor pós-operatória. Contudo, fentanil é mais eficaz do que dexmedetomidina.

Addition of dexmedetomidine to bupivacaine in ultrasonography-guided paravertebral blockade potentiates postoperative pain relief among patients undergoing thoracotomy / Adição de dexmedetomidina à bupivacaína em bloqueio paravertebral guiado por ultrassom potencializa o alívio da dor pós-operatória em pacientes submetidos à toracotomia

Abstract Background and objective: Thoracic paravertebral blockade is an alternative regional technique for comforting post-thoracotomy pain, thereby decreasing opioid consumption, postoperative nausea and vomiting, dizziness, respiratory depression and health care costs. The objective of this study was to investigate the effects of bupivacaine and bupivacaine plus dexmedetomidine on postoperative pain score and analgesic consumption in thoracotomy patients who had undergone ultrasonography-guided paravertebral blockade. Material and method: 93 ASA I-II patients aged 18-65 years were included in the study and scheduled for thoracic surgery. Prior to anesthesia induction, the paravertebral blockade procedure was performed by an anesthetist with ultrasonography. Cases were randomly stratified into three groups. The paravertebral blockade procedure was performed with 20 mL 0.5% bupivacaine injection in Group B (n = 31) and 20 mL 0.5% bupivacaine + 1 mL dexmedetomidine (100 µg) injection in Group BD. Group C received postoperative i.v. morphine via patient-controlled analgesia without paravertebral blockade. Post-operative pain scores were recorded in the recovery room and post-operatively using a VAS. Hemodynamic parameters, adverse effects and morphine consumption were also recorded. Results: No significant difference was determined between Group B and Group C regarding intra-operative adverse effects such as bradicardia and hypotension, while these adverse effects were significantly higher in Group BD (p = 0.04). VAS scores with rest and upon movement were significantly lower in Group BD compared to Group C (p < 0.001). Total morphine consumption was significantly lower in both Group B and Group BD in comparison with Group C (p < 0.001). In Group BD, HR and MAP were lower, but this was not clinically significant (p < 0.05). Conclusion: The addition of dexmedetomidine to bupivacaine lowers postoperative pain scores and morphine consumption in thoracotomy patients who receive ultrasonography guided paravertebral blockade.

Resumo Justificativa e objetivo: O bloqueio paravertebral torácico é uma técnica regional opcional para o alívio da dor pós-toracotomia, deste modo diminui o consumo de opioides, náuseas e vômitos no pós-operatório, tontura, depressão respiratória e custos com saúde. O objetivo deste estudo foi investigar os efeitos de bupivacaína isolada e bupivacaína + dexmedetomidina no escore de dor pós-operatória e no consumo de analgésicos em pacientes submetidos à toracotomia sob bloqueio paravertebral guiado por ultrassom. Material e método: Noventa e três pacientes, ASA I-II, com idades entre 18 e 65 anos, foram incluídos no estudo e programados para cirurgia torácica. Antes da indução anestésica, o procedimento de bloqueio paravertebral foi realizado por um anestesista com o uso de ultrassom. Os casos foram estratificados aleatoriamente em três grupos. O procedimento de bloqueio paravertebral foi realizado com injeção de 20 mL de bupivacaína a 0,5% no Grupo B (n = 31) e de 20 mL de bupivacaína a 0,5% + 1 mL de dexmedetomidina (100 µg) no Grupo BD. O Grupo C recebeu morfina intravenosa via analgesia controlada pelo paciente sem bloqueio paravertebral. Os escores de dor pós-operatória foram registrados na sala de recuperação e no pós-operatório usando a escala VAS. Parâmetros hemodinâmicos, efeitos adversos e consumo de morfina também foram registrados. Resultados: Não houve diferença significativa entre os grupos B e C em relação a efeitos adversos intraoperatórios, como bradicardia e hipotensão, enquanto esses efeitos adversos foram significativamente maiores no Grupo BD (p = 0,04). Os escores VAS em repouso e movimento foram significativamente menores no Grupo BD em relação ao Grupo C (p < 0,001). O consumo total de morfina foi significativamente menor nos grupos B e BD em comparação com o Grupo C (p < 0,001). No Grupo BD, a frequência cardíaca e a pressão arterial média foram menores, mas esse resultado não foi clinicamente significativo (p < 0,05). Conclusão: A adição de dexmedetomidina à bupivacaína reduz os escores de dor pós-operatória e o consumo de morfina em pacientes submetidos à toracotomia sob bloqueio paravertebral guiado por ultrassom.

Effectiveness and safety of exclusive spinal anesthesia with bupivacaine versus femoral sciatic block during the postoperative period of patients having undergone knee arthroscopy: systematic review / Efectividad y seguridad de la anestesia espinal exclusiva con bupivacaína vs el bloqueo ciático femoral en el postoperatorio de pacientes llevados a artroscopia de rodilla: revisión sistemática

Abstract Introduction: Spinal anesthesia (SA) and sciatic-femoral nerve block are the most widely used anesthesia techniques for knee arthroscopy; however, there is still some controversy with regard to which anesthetic procedure offers improved safety, better pain control, and higher patient satisfaction. Objective: To assess the effectiveness of exclusive SA with bupivacaine versus sciatic-femoral nerve block, regardless of the drug, during the postoperative period of patients having undergone knee arthroscopy, through a systematic review of the scientific literature. Methods: A search of Randomized Clinical Trials was conducted in a number of databases including Ovid, Cochrane, Embase, Lilacs, Open Grey, ClinicalTrials.gov, and academic Google. The snowball technique was also used to identify additional trials. The design of the search strategy included Boolean operators and considered studies in English, Spanish, and Portuguese, with no date restrictions. The information is presented in narrative form. Results: The search identified 478 studies, of which 3 met the eligibility criteria. The effectiveness was evaluated based on total anesthesia time and rescue analgesia. Safety was evaluated with heart rate monitoring and time to first micturition. Patient satisfaction was identified through surveys to measure the acceptance of the anesthetic technique. Conclusion: SA is effective as assessed based on the motor-sensory blockade effect and pain control, but its adverse events shall be taken into consideration when making a decision. The anesthetic techniques of the peripheral sciatic-femoral nerve block present less undesirable side effects than spinal analgesia and provide better postoperative pain control.

Resumen Introducción: La anestesia espinal y el bloqueo de nervios ciático-femoral son las técnicas de anestesia regional más utilizadas para la artroscopia de rodilla, sin embargo, existe controversia en relación a qué procedimiento anestésico ofrece mayor seguridad, mejor control del dolor y satisfacción del paciente. Objetivo: Evaluar la efectividad de la anestesia espinal exclusiva con bupivacaína vs el bloqueo de nervio ciático -femoral sin distinción de fármaco en el postoperatorio de pacientes intervenidos con artroscopia de rodilla, a través de una revisión sistemática de la literatura científica. Métodos: se realizó una búsqueda de Ensayos Clínicos Aleatorizados en las bases de datos Ovid, Cochrane, Embase, Lilacs, al igual que en Open Grey, ClinicalTrials.gov y Google académico, también se utilizó la técnica bola de nieve para encontrar estudios adicionales. El diseño de la estrategia de búsqueda incluyó operadores boleanos y consideró estudios en inglés, español y portugués, sin restricción de fecha. La información se presenta de forma narrativa. Resultados: la búsqueda identificó 478 estudios de los cuales tres cumplieron los criterios de elegibilidad. La efectividad fue valorada con el tiempo total de anestesia y analgesia de rescate. La seguridad fue evaluada con monitoreo de frecuencia cardiaca y tiempo de primera micción. La satisfacción del paciente se indagó a través de encuestas de aceptación de la técnica anestésica. Conclusiones: la anestesia espinal resulta efectiva valorada por el efecto de bloqueo motor-sensitivo y control del dolor, pero sus eventos adversos deben ser considerados en la selección. Las técnicas anestésicas de bloqueo periférico del nervio ciático-femoral presentan menos efectos indeseables que la analgesia espinal y ofrecen un mejor control del dolor postoperatorio.

Combination of clonidine-bupivacaine in caudal epidural anesthesia for hypospadias surgery in children: prospective, randomized, blind study / Associação clonidina-bupivacaína na anestesia peridural caudal para cirurgia de hipospádia em crianças: estudo prospectivo, randomizado, encoberto

Abstract Background and objectives: The combination of clonidine with local anesthetic administered for epidural anesthesia via caudal route seems to improve the quality of postoperative analgesia, but with conflicting results. This study compared the postoperative analgesia of three different doses of clonidine combined with bupivacaine in caudal epidural anesthesia in children undergoing hypospadias repair. Methods: Eighty children aged 1-10 years, candidates for surgical repair of hypospadias, were randomly divided into four groups of 20 patients to receive general anesthesia combined with caudal epidural anesthesia with bupivacaine 0.165% alone or in combination with 1, 2 or 3 µg.kg- 1 of clonidine. The primary outcome was morphine consumption in the first 24 h postoperatively. Mean arterial pressure, heart rate, end-tidal concentration of sevoflurane, time to awakening, pain severity (FLACC scale), level of sedation (RAMSAY), duration of analgesia, and occurrence of adverse effects were also compared. Results: Intraoperatively, there was no difference between groups regarding mean arterial pressure, heart rate, end-tidal concentration of sevoflurane, and time to awakening. Postoperative morphine consumption and pain severity were similar between groups, but the group receiving clonidine (3 µg.kg-1) had lower heart rate and higher sedation level than the group receiving bupivacaine alone. Conclusions: The combination of clonidine at doses of 1, 2 or 3 µg.kg-1 with bupivacaine 0.16% via caudal epidural route did not alter the consumption of morphine in the early postoperative period of children undergoing hypospadias repair.

Resumo Justificativa e objetivos: A associação de clonidina ao anestésico local administrado por via peridural caudal parece melhorar a qualidade da analgesia pós-operatória, mas com resultados conflitantes. Este estudo comparou a analgesia pós-operatória de três diferentes doses de clonidina associada à bupivacaína na anestesia peridural caudal em crianças submetidas à correção de hipospádia. Método: Oitenta crianças entre um e dez anos, candidatas à correção cirúrgica de hipospádia, foram divididas, aleatoriamente, em quatro grupos de 20 pacientes para receber anestesia geral associada à anestesia peridural caudal com bupivacaína 0,166% isolada ou associada a 1, 2 ou 3 µg.Kg-1 de clonidina. Como desfecho principal avaliou-se o consumo de morfina nas primeiras 24 horas de pós-operatório. Compararam-se também pressão arterial média, frequência cardíaca, concentração expirada de sevoflurano, tempo de despertar da anestesia, intensidade da dor pela escala FLACC, nível de sedação (Ramsay), tempo de duração da analgesia e ocorrência de efeitos adversos. Resultados: No transoperatório, não houve diferença entre os grupos quanto à pressão arterial média, frequência cardíaca, concentração expirada de sevoflurano e ao tempo de despertar. No pós-operatório, o consumo de morfina e a intensidade da dor foram similares entre os grupos, mas o grupo que recebeu 3 µg.Kg-1 de clonidina apresentou menor frequência cardíaca e maior sedação do que o grupo que recebeu somente bupivacaína. Conclusões: A associação de clonidina nas doses de 1, 2 ou 3 µg.Kg-1 à bupivacaína 0,166% por via peridural caudal não alterou o consumo de morfina no pós-operatório imediato de crianças submetidas à correção de hipospádia.

The chondrotoxic and apoptotic effects of levobupivacaine and bupivacaine on the rabbit knee joint / Os efeitos condrotóxicos e apoptóticos de levobupivacaína e bupivacaína na articulação do joelho de coelhos

Abstract Background: A single dose injection or continuous infusion of local anesthetics into the joint space is considered to be a well-defined analgesia technique. The aim of this study was to investigate the chondrotoxic and apoptotic effects of single-dose intra-articular injection of levobupivacaine and bupivacaine on rabbit knee joint tissues. Materials and methods: The animals were allocated into two groups each containing 20 rabbits. 0.5% levobupivacaine (Group L) and 0.5% bupivacaine (Group B) were applied intra-articularly to the left posterior joints of rabbits. At the same time, normal saline was applied to the right posterior leg knee joints of rabbits in both groups and used as a control (Group S). At the end of the 7th and 28th days after the intraarticular injections, ten randomly chosen rabbits in each group were killed by applying intraperitoneal thiopental. Sections of cartilage tissue samples were stained for light microscopic examinations and the TUNEL method was used to investigate apoptotic cells. Results: As a result of immunofluorescence microscopic examination, the number of apoptotic cells in Group B at day 7 and day 28 were both significantly higher than Group L and S (p < 0.05). Also, the number of apoptotic cells in Group L at day 7 and day 28 were both significantly higher than Group S (p < 0.05). Conclusions: We found that bupivacaine is more chondrotoxic than other anesthetic agent and increases the number of apoptotic cells. These results indicated that bupivacaine caused high chondrotoxic damage and it led to more apoptotic activation than levobupivacaine.

Resumo Justificativa: Uma injeção em dose única ou infusão contínua de anestésicos locais no espaço articular é considerada uma técnica de analgesia bem definida. O objetivo deste estudo foi investigar os efeitos condrotóxicos e apoptóticos da injeção intra-articular com dose única de levobupivacaína e bupivacaína em tecidos articulares do joelho de coelho. Material e métodos: Os animais foram alocados em dois grupos, cada um contendo 20 coelhos. Levobupivacaína a 0,5% (Grupo L) e bupivacaína a 0,5% (Grupo B) foram aplicadas intra-articularmente nas articulações posteriores esquerdas de coelhos. Ao mesmo tempo, solução salina normal foi aplicada nas articulações do joelho da perna posterior direita de coelhos em ambos os grupos e usada como controle (Grupo S). Ao fim do 7° e 28° dias após as injeções intra-articulares, 10 coelhos escolhidos aleatoriamente em cada grupo foram mortos por aplicação de tiopental intraperitoneal. Seções de amostras de tecido cartilaginoso foram coradas para exames de microscopia de luz, e o método TUNEL foi usado para investigar células apoptóticas. Resultados: Como resultado do exame microscópico de imunofluorescência nos dias 7 e 28, o número de células apoptóticas no Grupo B foi significativamente maior que nos grupos L e S (p < 0,05). Além disso, o número de células apoptóticas nos dias 7 e 28 foi significativamente maior no Grupo L do que no Grupo S (p < 0,05). Conclusões: Demonstramos que a bupivacaína é mais condrotóxica do que o outro agente anestésico e aumenta o número de células apoptóticas. Esses resultados indicaram que a bupivacaína causou intensa lesão condrotóxica e levou a uma ativação apoptótica maior do que a levobupivacaína.