Interscalene block in the context of enhanced recovery for shoulder: A case series. / Bloqueo interescalénico en el contexto de la recuperación acelerada para artroscopía de hombro: serie de casos.

Introduction: The application of enhanced recovery in shoulder surgery has not had such a favorable acceptance, therefore, the objective of this study was to present and describe the use of interscalene block to promote enhanced recovery in a series of patients undergoing shoulder arthroscopic surgery. Methods: Thirty-five patients undergoing arthroscopic shoulder surgery were included, in whom interscalene blockade and sedation were administered. Subsequently, pain intensity, nausea, vomiting, dyspnea, presence of Horner's syndrome, blurred vision, hoarseness, time elapsed to discharge, unplanned readmissions, patient satisfaction, and compliance with hospital discharge criteria in the first 12 weeks were evaluated, hours following the criteria of an enhanced recovery. Results: 27 patients (77,1%) had ASA I and 8 patients (22,8%) ASA II, 97,1% were rotator cuff repairs. Before discharge, two patients (5.7%) had nausea. At discharge, no patient had dyspnea or blurred vision, two patients (5.7%) developed hoarseness, and the median pain intensity was 1.0 (0.0-7.0). Between 24 and 48 hours only one patient (2.8%) presented nausea and the median pain intensity was 1.0 (0.0-8.0). All the patients were satisfied with their willingness to repeat the experience, 100% of the patients met the criteria for medical discharge after 12 hours, 30 patients (85.7%) were discharged the same day, the stay was 12 (11.5 to 12.5) hours, and no patient was readmitted. Conclusion: In selected patients with a committed, trained and experienced surgical-anesthetic team, there is a high possibility that the interscalene block will favor the performance of enhanced recovery programs in shoulder arthroscopic surgery.

Introducción: La aplicación de la recuperación acelerada en cirugía de hombro no ha tenido una aceptación tan favorable. Por ello, el objetivo de este estudio fue presentar y describir el uso de bloqueo interescalénico para favorecer la recuperación acelerada en una serie de pacientes sometidos a cirugía artroscopica de hombro. Métodos: Se incluyeron 35 pacientes sometidos a cirugía artroscópica de hombro, en quienes se administró bloqueo interescalénico y sedación. Posteriormente se evaluó la intensidad del dolor, náuseas, vómito, disnea, presencia de síndrome de Horner, visión borrosa, ronquera, tiempo transcurrido hasta el alta, reingresos no planeados, satisfacción del paciente y cumplimiento de los criterios de alta hospitalaria en las primeras 12 horas siguiendo los criterios de una recuperación acelerada. Resultados: En total, 27 pacientes (77,1%) tuvieron clasificación de la (ASA) I y 8 pacientes (22,9%) ASA II. Además, 97,1% fueron reparaciones de manguito rotador. Previo al alta, dos pacientes (5,7%) presentaron náuseas. Al momento del alta ningún paciente presentó disnea o visión borrosa, dos pacientes (5,7%) presentaron ronquera y la mediana de intensidad del dolor fue de 1,0 (0,0 a 7,0). Entre las 24 y 48 horas solo un (2,8%) paciente presentó náuseas y la mediana de intensidad del dolor fue de 1,0 (0,0 a 8,0). Todos los pacientes se mostraron satisfechos con disposición a repetir la experiencia. El 100% de pacientes cumplió los criterios médicos de alta a las 12 horas y 30 pacientes (85,7%) se dieron de alta el mismo día. La estancia fue de 12 (11,5 a 12,5) horas y ningún paciente reingresó. Conclusión: En pacientes seleccionados, con un equipo quirúrgico-anestésico comprometido, capacitado y con experiencia, hay una alta posibilidad de que el bloqueo interescalénico favorezca la realización de programas de recuperación acelerada en cirugía artroscópica de hombro.

Bloqueo interescalénico en el contexto de la recuperación acelerada para artroscopía de hombro: serie de casos / Interscalene block in the context of enhanced recovery for shoulder: A case series

Introducción La aplicación de la recuperación acelerada en cirugía de hombro no ha tenido una aceptación tan favorable. Por ello, el objetivo de este estudio fue presentar y describir el uso de bloqueo interescalénico para favorecer la recuperación acelerada en una serie de pacientes sometidos a cirugía artroscopica de hombro. Métodos Se incluyeron 35 pacientes sometidos a cirugía artroscópica de hombro, en quienes se administró bloqueo interescalénico y sedación. Posteriormente se evaluó la intensidad del dolor, náuseas, vómito, disnea, presencia de síndrome de Horner, visión borrosa, ronquera, tiempo transcurrido hasta el alta, reingresos no planeados, satisfacción del paciente y cumplimiento de los criterios de alta hospitalaria en las primeras 12 horas siguiendo los criterios de una recuperación acelerada. Resultados En total, 27 pacientes (77,1%) tuvieron clasificación de la (ASA) I y 8 pacientes (22,9%) ASA II. Además, 97,1% fueron reparaciones de manguito rotador. Previo al alta, dos pacientes (5,7%) presentaron náuseas. Al momento del alta ningún paciente presentó disnea o visión borrosa, dos pacientes (5,7%) presentaron ronquera y la mediana de intensidad del dolor fue de 1,0 (0,0 a 7,0). Entre las 24 y 48 horas solo un (2,8%) paciente presentó náuseas y la mediana de intensidad del dolor fue de 1,0 (0,0 a 8,0). Todos los pacientes se mostraron satisfechos con disposición a repetir la experiencia. El 100% de pacientes cumplió los criterios médicos de alta a las 12 horas y 30 pacientes (85,7%) se dieron de alta el mismo día. La estancia fue de 12 (11,5 a 12,5) horas y ningún paciente reingresó. Conclusión En pacientes seleccionados, con un equipo quirúrgico-anestésico comprometido, capacitado y con experiencia, hay una alta posibilidad de que el bloqueo interescalénico favorezca la realización de programas de recuperación acelerada en cirugía artroscópica de hombro.

Introduction The application of enhanced recovery in shoulder surgery has not had such a favorable acceptance, therefore, the objective of this study was to present and describe the use of interscalene block to promote enhanced recovery in a series of patients undergoing shoulder arthroscopic surgery. Methods Thirty-five patients undergoing arthroscopic shoulder surgery were included, in whom interscalene blockade and sedation were administered. Subsequently, pain intensity, nausea, vomiting, dyspnea, presence of Horner's syndrome, blurred vision, hoarseness, time elapsed to discharge, unplanned readmissions, patient satisfaction, and compliance with hospital discharge criteria in the first 12 weeks were evaluated, hours following the criteria of an enhanced recovery. Results 27 patients (77,1%) had ASA I and 8 patients (22,8%) ASA II, 97,1% were rotator cuff repairs. Before discharge, two patients (5.7%) had nausea. At discharge, no patient had dyspnea or blurred vision, two patients (5.7%) developed hoarseness, and the median pain intensity was 1.0 (0.0-7.0). Between 24 and 48 hours only one patient (2.8%) presented nausea and the median pain intensity was 1.0 (0.0-8.0). All the patients were satisfied with their willingness to repeat the experience, 100% of the patients met the criteria for medical discharge after 12 hours, 30 patients (85.7%) were discharged the same day, the stay was 12 (11.5 to 12.5) hours, and no patient was readmitted. Conclusion In selected patients with a committed, trained and experienced surgical-anesthetic team, there is a high possibility that the interscalene block will favor the performance of enhanced recovery programs in shoulder arthroscopic surgery.

Epigenetics and Postsurgical Pain: A Scoping Review.

OBJECTIVE: Multiple factors are involved in the physiology and variability of postsurgical pain, a great part of which can be explained by genetic and environmental factors and their interaction. Epigenetics refers to the mechanism by which the environment alters the stability and expression of genes. We conducted a scoping review to examine the available evidence in both animal models and clinical studies on epigenetic mechanisms involved in the regulation of postsurgical and chronic postsurgical pain. METHODS: The Arksey and O'Malley framework and the PRISMA-ScR (Preferred Reporting Items for Systematic Review and Meta-Analysis, scoping reviews extension) guidelines were used. The PubMed, Web of Science, and Google Scholar databases were searched, and the original articles cited in reviews located through the search were also reviewed. English-language articles without time limits were retrieved. Articles were selected if the abstract addressed information on the epigenetic or epigenomic mechanisms, histone, or DNA methylation and microribonucleic acids involved in postsurgical and chronic postsurgical pain in animal models and clinical studies. RESULTS: The initial search provided 174 articles, and 95 were used. The available studies to date, mostly in animal models, have shown that epigenetics contributes to the regulation of gene expression in the pathways involved in postsurgical pain and in maintaining long-term pain. CONCLUSION: Research on possible epigenetic mechanisms involved in postsurgical pain and chronic postsurgical pain in humans is scarce. In view of the evidence available in animal models, there is a need to evaluate epigenetic pain mechanisms in the context of human and clinical studies.

COVID-19: Regional Anesthesia, Benefits, and Practical Recommendations.

During coronavirus disease 2019 (COVID-19) pandemic, efforts have been made to rethink the health system and provide various recommendations to the best care of patients and for the protection of health personnel. In patients with suspicion or confirmation of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) who require surgical intervention and anesthetic management, strategies must be established to minimize aerosol-generating procedures. Regional anesthesia (RA) is not considered an aerosol-generating procedure per se and is currently proposed such as a safe strategy and part of comprehensive perioperative care. However, the preoperative evaluation has undergone changes in the context of the COVID-19 pandemic, so in addition to routine preoperative evaluation, a patient-oriented history, clinical, laboratory, and radiologic evaluation should be performed, and a series of general recommendations should be taken into account before, during, and after the performance of RA procedure. A search of PubMed/MEDLINE, Web of Science, and Google Scholar databases was performed until August 22, 2020, using the words: 〞regional anesthesia or nerve block or peripheral nerve block or spinal anesthesia or epidural anesthesia and SARS-CoV-2 or COVID-19 or MERS or SARS-CoV-1 or influenza.〞 We included in this review all articles, regardless of design, published in the English language. Given the benefits reported with the use of RA techniques, both for the patient and for healthcare personnel, it has recently been suggested that RA should be considered as the first choice. However, it is important to generate more precise and homogeneous management guidelines based on the evidence obtained every day during the care of patients with COVID-19.

Implications of COVID-19 (SARS-CoV-2) for the anesthesiological practice. / Implicaciones del COVID-19 (SARS-CoV-2) para la práctica anestesiológica.

The purpose of this article is to review the characteristics of SARS-CoV-2, the clinical-epidemiological aspects of COVID-19, and the implications anesthesiologists when performing aerosol-generating procedures. A search of PubMed/MEDLINE, Scopus, SciELO, and Web of Science databases was performed until April 9, 2020, using the words: "COVID-19 or COVID19 or SARS-CoV-2 and anesthesiology or anesthesia". Forty-eight articles with information on the management of the patient in the perioperative period or the intensive care unit when suspected or confirmed SARS-CoV-2 infection were included. In general, the postponement of elective surgeries for no more than 6 to 8 weeks, depending on the clinical condition of the patients is recommended. In the case of urgent or emergency surgeries, we review the use of personal protection gear, as well as the recommended strategies for carrying out the procedure.

El objetivo de este artículo es revisar las características del SARS-CoV-2, los aspectos clínico-epidemiológicos de COVID-19 y las implicaciones que tienen para los anestesiólogos al realizar procedimientos generadores de aerosoles. Se realizó una búsqueda en las bases de datos PubMed, Scopus, SciELO y Web of Science hasta el 9 de abril de 2020, utilizando las palabras: “COVID-19 or COVID19 or SARS-CoV-2 and anesthesiology or anesthesia”. Se incluyeron 48 artículos con información sobre el manejo del paciente en el perioperatorio o en la unidad de cuidados intensivos ante la sospecha o confirmación de infección por SARS-CoV-2. En general, se recomienda el aplazamiento de las cirugías electivas por no más de seis a ocho semanas, de acuerdo a las condiciones clínicas de los pacientes. En el caso de cirugías de urgencia o emergencia, se revisan tópicos del sistema de protección personal así como las estrategias recomendadas para la realización de los procedimientos.

Implicaciones del COVID-19 (SARS-CoV-2) para la práctica anestesiológica / Implications of COVID-19 (SARS-CoV-2) for the anesthesiological practice

El objetivo de este artículo es revisar las características del SARS-CoV-2, los aspectos clínico-epidemiológicos de COVID-19 y las implicaciones que tienen para los anestesiólogos al realizar procedimientos generadores de aerosoles. Se realizó una búsqueda en las bases de datos PubMed, Scopus, SciELO y Web of Science hasta el 9 de abril de 2020, utilizando las palabras: "COVID-19 or COVID19 or SARS-CoV-2 and anesthesiology or anesthesia". Se incluyeron 48 artículos con información sobre el manejo del paciente en el perioperatorio o en la unidad de cuidados intensivos ante la sospecha o confirmación de infección por SARS-CoV-2. En general, se recomienda el aplazamiento de las cirugías electivas por no más de seis a ocho semanas, de acuerdo a las condiciones clínicas de los pacientes. En el caso de cirugías de urgencia o emergencia, se revisan tópicos del sistema de protección personal así como las estrategias recomendadas para la realización de los procedimientos.

The purpose of this article is to review the characteristics of SARS-CoV-2, the clinical-epidemiological aspects of COVID-19, and the implications anesthesiologists when performing aerosol-generating procedures. A search of PubMed/MEDLINE, Scopus, SciELO, and Web of Science databases was performed until April 9, 2020, using the words: "COVID-19 or COVID19 or SARS-CoV-2 and anesthesiology or anesthesia". Forty-eight articles with information on the management of the patient in the perioperative period or the intensive care unit when suspected or confirmed SARS-CoV-2 infection were included. In general, the postponement of elective surgeries for no more than 6 to 8 weeks, depending on the clinical condition of the patients is recommended. In the case of urgent or emergency surgeries, we review the use of personal protection gear, as well as the recommended strategies for carrying out the procedure.

Chronic pain in patients with breast cancer. / Dolor crónico en pacientes con cáncer de mama.

Breast cancer is the most frequent cancer in women. Even though most women diagnosed with breast cancer survive, many of them experience pain as part of the disease process or as a side effect of diagnostic or therapeutic procedures. Given that chronic pain in patients with breast cancer is a complex experience, the objective of this article was to conduct a systematic review of the scientific literature available in the PubMed database in English language between January 2000 and September 2019 on the epidemiology, risk factors, clinical characteristics, preventive strategies and treatment of chronic pain in patients with breast cancer, since the knowledge of these aspects is transcendental to identify, treat and monitor patients in the long term, in order to avoid further impact on their quality of life, already altered.

El cáncer de mama es el cáncer más frecuente en la mujer. Aun cuando la mayoría de las mujeres diagnosticadas con cáncer de mama sobreviven, muchas de ellas experimentan dolor como parte del proceso de enfermedad o como un efecto colateral de los procedimientos diagnósticos o terapéuticos. Dado que el dolor crónico en las pacientes con cáncer de mama es una experiencia compleja, el objetivo de este artículo fue realizar una revisión narrativa de la literatura científica disponible en la base datos PubMed en idioma inglés entre enero de 2000 y septiembre de 2019 sobre la epidemiología, factores de riesgo, características clínicas, estrategias preventivas y tratamiento del dolor crónico en pacientes con cáncer de mama, ya que el conocimiento de estos aspectos es trascendental para identificar, tratar y vigilar a las pacientes a largo plazo, a fin de evitar una mayor afectación en su calidad de vida, ya de por sí alterada.

Circulating tumor cells in breast cancer. / Células tumorales circulantes en cáncer de mama.

Breast cancer is the most recurrent cancer in female population, its mortality is related to the presence of distant metastases. Distant metastasis begins as a small group of cells that spread regionally and remotely from the site of primary origin. Circulating tumor cells (CTC) are present in the blood of cancer patients and are therefore considered disease markers and precursors of metastasis. It is trascendental the review of the molecular aspects of the metastatic process, the available techniques for the enrichment, identification and molecular characterization of CTC, as well as some examples of its usefulness and clinical application in patients with breast cancer, including aspects related to perioperative management during breast cancer surgery.

El cáncer de mama es el cáncer más recurrente en la población femenina, su mortalidad se relaciona con la presencia de metástasis a distancia. La metástasis a distancia inicia como un pequeño grupo de células que se diseminan a nivel regional y a distancia del sitio de origen primario. Las células tumorales circulantes (CTC) están presentes en la sangre de las pacientes con cáncer, por lo que se consideran marcadores de enfermedad y precursoras de metástasis. Es transcendental la revisión de los aspectos moleculares del proceso metástasico, las técnicas disponibles para el enriquecimiento, identificación y caracterización molecular de CTC, así como algunos ejemplos de su utilidad y aplicación clínica en pacientes con cáncer de mama, incluyendo aspectos relacionados con el manejo perioperatorio durante la cirugía oncológica mamaria.

Hypothyroidism and isolated hypothyroxinemia in pregnancy, from physiology to the clinic.

Many changes occur in the physiology of the maternal thyroid gland to maintain an adequate level of thyroid hormones (THs) at each stage of gestation during normal pregnancy, however, some factors can produce low levels of these hormones, which can alter the onset and progression of pregnancy. Deficiency of THs can be moderate or severe, and classified as overt or clinical hypothyroidism, subclinical hypothyroidism, and isolated hypothyroxinemia. Overt hypothyroidism has been reported in 0.3-1.9% and subclinical hypothyroidism in approximately 1.5-5% of pregnancies. With respect to isolated hypothyroxinemia, the frequency has been reported in approximately 1.3% of pregnant women, however it can be as high as 25.4%. Worldwide, iodine deficiency is the most common cause of hypothyroidism, however, in iodine-sufficient countries like the United States, the most common cause is autoimmune thyroiditis or Hashimoto's thyroiditis. The diagnosis and timely treatment of deficiency of THs (before or during the first weeks of gestation) can significantly reduce some of the related adverse effects, such as recurrent pregnancy loss, preterm delivery, gestational hypertension, and alterations in the offspring. However, so far there is no consensus on the reference levels of thyroid hormones during pregnancy to establish the diagnosis and there is no consensus on universal screening of women during first trimester of pregnancy to identify thyroid dysfunction, to give treatment and to reduce adverse perinatal events, so it is necessary to carry out specific studies for each population that provide information about it.

Effect of interscalene nerve block on the inflammatory response in shoulder surgery: a randomized trial.

BACKGROUND: Comparing techniques of general anesthesia and regional anesthesia in arthroscopic shoulder surgery, some studies have shown differences in the intensity of immediate postoperative pain and neuroendocrine response, but the inflammatory response when using balanced general anesthesia (BGA) vs. an ultrasound-guided (USG) single-dose interscalene block (SDIB) has not been compared. MATERIALS AND METHODS: In a single-center, prospective, randomized clinical trial, the inflammatory response of 2 groups of 10 patients scheduled to undergo arthroscopic shoulder surgery was evaluated through measurement of a panel of cytokines that act on cells of the adaptive immune response to promote or inhibit inflammation, chemokines involved in chemotaxis, the erythrocyte sedimentation rate (ESR), the high-sensitivity C-reactive protein (CRP) level, and the white blood cell (WBC) count in 3 blood samples (before anesthesia, immediately postoperatively, and 24 hours postoperatively) with 2 types of anesthesia (BGA vs. USG SDIB). Postoperative pain intensity (immediately, at 12 hours, and at 24 hours) was also assessed. RESULTS: The ESR and CRP level increased significantly at 24 hours after surgery; however, the increase in ESR (P < .0001) and CRP level (P < .0001) was lower in the USG SDIB group. Significant increases in the levels of soluble interleukin 2 receptor α (P = .022) and interleukin 12p40 (P = .016) occurred in the immediate postoperative period in the USG SDIB group. Immediate postoperative pain showed a significant increase (P < .001) in the BGA group. CONCLUSIONS: In arthroscopic shoulder surgery, the use of a USG SDIB compared with the use of BGA is possibly associated with improved pain control in the immediate postoperative period and lower immunosuppression, even at 24 hours after surgery.

[Bilateral brachial plexus block. Case report and systematic review]. / Bloqueo bilateral del plexo braquial. Reporte de casos y revisión sistemática de la literatura.

BACKGROUND: The bilateral brachial plexus block is considered a contraindication, due to the possible development of complications, such as: toxicity from local anaesthetics or bilateral diaphragmatic paralysis. However, with the real time visualisation provided by the ultrasound scan, these complications have decreased and it is a safer procedure. CLINICAL CASES: Four cases are presented where the bilateral block was performed using guided ultrasound, as the patients were unable to receive general anaesthesia due to a history of adverse effects or the use of opioids in the post-operative or by the prediction of a difficult airway associated with obesity. A systematic review of the literature from January 1993 to June 2013, was also performed by using a search in the MEDLINE, EMBASE, ARTEMISA, LILACS, Google data bases, in Spanish and English language with the following words: bilateral brachial plexus block, bilateral interscalene block, bilateral infraclavicular block, bilateral supraclavicular block, bilateral lateral supraclavicular block, bilateral axillary block, ultrasound-guided bilateral brachial plexus block. CONCLUSION: Based on the evidence found, ultrasound-guided bilateral brachial plexus block in selected patients and expert hands, is no longer a contraindication.

[Interscalene block for total shoulder arthroplasty: comparative study (ultrasound vs. neurostimulation)]. / Bloqueo interescalénico para artroplastia total de hombro: estudio comparativo ultrasonido vs neuroestimulación.

BACKGROUND: Modern anesthesiology has integrated the use of ultrasonography as a tool that has displaced neurostimulation as a technique for locating peripheral nerves. The aim of this study was to determine which procedure is more effective for guiding interscalene block for total shoulder arthroplasty. METHODS: We carried out a comparative, prospective non-randomized study comprised of the group guided by neurostimulation interscalene block and the group guided by ultrasound. All patients in both groups were scheduled for total shoulder arthroplasty. Latency, degree of sensory and motor block, success rate, postoperative pain intensity at 6, 12, and 24 h, patient satisfaction and complications were measured. RESULTS: We included 110 patients, 55 per group. Patients were placed in beach chair position and the deltopectoral approach was used. There were no differences in demographic characteristics. Results for neurostimulation vs. ultrasound group: latency 19.11 ± 2.27 vs. 17.24 ± 1.42 min, p= 0.23. Block sensitivity in both groups was grade 0 motor block grade 0 in 76.4% and grade 1 in 23.6% vs. grade 0 to 100%. There was 100% success rate for both groups. Postoperative pain at 6 h was 0.13 ± 0.54 vs. 0.11 ± 0.13 p= 0.90, at 12 h 1.67 ± 1.15 vs. 1.65 ± 0.59 p= 0.89 and at 24 h 3.15 ± 1.66 vs. 2.99 ± 1.15 p= 0.78. Satisfaction 54.5% very satisfied and 45.5% satisfied 96.36% vs 3.6% very satisfied and satisfied. Complications 18.18% vs. 3.6% p= 0.023. CONCLUSION: Ultrasound-guided interscalene nerve block is the technique of choice in elective total shoulder arthroplasty.

ANTECEDENTES: la anestesiología moderna ha integrado a la ultrasonografía como una herramienta que ha desplazado a la neuroestimulación como técnica de localización de nervios periféricos: ¿cuál es más efectiva para guiar el bloqueo interescalénico en artroplastia total de hombro? OBJETIVO: comparar dos técnicas de localización del plexo braquial bloqueo interescalénico como técnica anestésica en artroplastia total de hombro. MATERIAL Y MÉTODOS: estudio comparativo, prospectivo, sin asignación al azar. Se incluyeron todos los pacientes programados para artroplastia total de hombro; se formaron 2 grupos: grupo neuroestimulación donde el bloqueo interescalénico fue guiado por neuroestimulación, grupo ultrasonido que fue guiado por ultrasonido. Se midió el tiempo de latencia, grado de bloqueo sensitivo y motor, tasa de éxito, intensidad del dolor postoperatorio a las 6, 12 y 24 horas, satisfacción, y complicaciones. RESULTADOS: se incluyeron 110 pacientes, 55 por grupo, posición de silla de playa y abordaje deltopectoral. No hubo diferencias en las características demográficas, neuroestimulación vs ultrasonografía: latencia 19.11 ± 2.27 vs 17.24 ± 1.42 minutos p= 0.23. Bloqueo sensitivo en ambos grupos grado 0, bloqueo motor grado 0 en 76.4% y grado 1 en 23.6%, vs grado 0 en 100%. Tasa de éxito 100% en ambos grupos, dolor postoperatorio 6 horas 0.13 ± 0.54 vs 0.11 ± 0.13 p= 0.90; 12 horas de 1.67 ± 1.15 vs 1.65 ± 0.59 p= 0.89, 24 horas 3.15± 1.66 vs 2.99 ± 1.15 p= 0.78. Satisfacción: 54.5% muy satisfecho, y 45.5% satisfecho vs 96.36% muy satisfecho y 3.6% satisfecho. Complicaciones 18.18% vs 3.6% p= 0.023. CONCLUSIÓN: el ultrasonido es la técnica de localización del plexo braquial de elección en artroplastia total de hombro.