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1.
Cir Pediatr ; 36(2): 83-89, 2023 Apr 01.
Article in English, Spanish | MEDLINE | ID: mdl-37093118

ABSTRACT

OBJECTIVE: To describe a basic training program in microsurgery and to analyze the learning curve through the process, including improvement in operating times and functional outcome. MATERIALS AND METHODS: Our learning program included basic, transitional, and experimental models. The experimental model included tail vein cannulation, intestinal resection and anastomosis, dissection, division and anastomosis of the cava and aorta. Wistar rats (66.7% male; 406.9 ± 38.9 grams) were used. The program adhered to the 3R principle and obtained animal welfare committee approval. RESULTS: Mean tail vein cannulation time was 2.4 ± 1.2 minutes. Mean intestinal resection and jejunocolic anastomosis time was 14.8 ± 2.7 minutes and 10.4 ± 3 minutes, respectively. All anastomoses were functionally valid. Mean vessel dissection time was 22.9 ± 7.7 minutes, aortic artery anastomosis was 17.2 ± 7.1 minutes, and vena cava anastomosis was 25.9 ± 7.3 minutes. 66.7% of vena cava anastomoses were functionally valid vs. 88.9% for the aorta. The time required for all procedures decreased after the third attempt, except for vena cava anastomoses, which remained similar in all 9 procedures. CONCLUSIONS: Our model demonstrated that the procedures were suitable for trainer progression in terms of surgical time and functional outcome. Microsurgical training would benefit from standardized programs to optimize results.


OBJETIVO: Describimos un programa de formación básica en microcirugía y analizamos la curva de aprendizaje a través del proceso, incluyendo la mejora en los tiempos operatorios y en el resultado funcional del procedimiento. MATERIAL Y METODOS: Nuestro programa de aprendizaje incluye modelos básicos, de transición y experimentales. Dentro del modelo experimental se incluyeron: canulación de la vena de la cola, resección y anastomosis intestinal, disección, sección y anastomosis de la cava y la aorta. Se emplearon ratas Wistar (66,7% machos; 406,9 ± 38,9 gramos), el programa se adhirió al principio de las 3R y obtuvo la aprobación del comité de bienestar animal. RESULTADOS: El tiempo medio de canulación de la vena de la cola fue de 2.4 ± 1,2 minutos. El tiempo medio de resección intestinal y anastomosis yeyunocólica de 14.8 ± 2,7 minutos y 10.4 ± 3 minutos, respectivamente. Todas las anastomosis fueron funcionalmente válidas. El tiempo medio de la disección de vasos fue de 22,9 ± 7,7 minutos, la anastomosis de la arteria aorta de 17,2 ± 7,1 minutos, mientras que la anastomosis de la vena cava fue de 25,9 ± 7,3 minutos. El 66,7% de las anastomosis de la vena cava fueron funcionalmente válidas en comparación con el 88,9% de la aorta. El tiempo requerido para todos los procedimientos disminuyó después del tercer intento, excepto para las anastomosis de vena cava, que se mantuvo similar en los 9 procedimientos. CONCLUSIONES: Nuestro modelo demostró que los procedimientos eran adecuados para la progresión del entrenador en términos de tiempo quirúrgico y resultado funcional. La formación microquirúrgica se beneficiaría de programas estandarizados para optimizar los resultados.


Subject(s)
Microsurgery , Surgeons , Rats , Animals , Male , Humans , Female , Microsurgery/methods , Rats, Wistar , Vascular Surgical Procedures/education , Anastomosis, Surgical/methods
2.
Cir Pediatr ; 34(2): 85-89, 2021 Apr 01.
Article in English, Spanish | MEDLINE | ID: mdl-33826261

ABSTRACT

INTRODUCTION: As a result of the emergence of the SARS-CoV-2 respiratory virus in Wuhan in December 2019, the Spanish Government declared the state of emergency with restrictions such as stay-at-home lockdown. The objective of this study was to analyze emergency activity at a referral pediatric surgery unit in its territory and determine whether surgical pathologies had decreased or not. METHODS: A retrospective study of pediatric patients presenting at the emergency department and referred to the pediatric surgery unit from March 14, 2020 to April 20, 2020 was carried out. The results were compared with those from the same dates of the previous year. Demographic variables, pathologies, and management strategies were studied for each case. The number of patients with abdominal pain requiring surgical assessment was also analyzed. RESULTS: 161 patients were included - 91 from 2019 and 70 from 2020. Of the 2020 patients, 62 (88.6%) underwent surgery and 8 (11.4%) were admitted, whereas in 2019, patient distribution was 67 (73.6%) and 24 (26.4%), which means there were fewer admissions in 2020 (p= 0.018). There were no differences in terms of hours to emergency department consultation - just an increase in the case of appendicular pathologies in the 2020 period, with 24 [23-48] hours vs. 24 [12-30] hours (p =  0.045). CONCLUSION: The current pandemic has not caused emergency surgeries to decrease. It has only increased time to consultation in patients with appendicular pathologies.


INTRODUCCION: A raíz de la aparición del virus respiratorio SARS-CoV-2 en Wuhan en diciembre de 2019, el Gobierno de España decretó el estado de alarma con medidas que han incluido el confinamiento domiciliario. El objetivo de este trabajo es analizar la actividad urgente de un Servicio de Cirugía Pediátrica referente en su Comunidad Autónoma y comprobar si ha existido disminución o no en la patología quirúrgica. METODOS: Estudio retrospectivo de los pacientes pediátricos que acudieron a Urgencias y fueron derivados a Cirugía Pediátrica entre los periodos del 14 de marzo hasta el 20 de abril de 2020, comparándolos con aquellos que acudieron en las mismas fechas del año previo. Se analizaron variables demográficas, la patología y el tipo de manejo en cada caso. Se analizó también el número de pacientes con dolor abdominal que precisaron valoración quirúrgica. RESULTADOS: Se incluyeron 161 pacientes, de los que 91 acudieron en 2019 y 70 acudieron en 2020. De estos últimos, 62 (88,6%) fueron intervenidos y 8 (11,4%) fueron hospitalizados, mientras que en 2019 fueron 67 (73,6%) y 24 (26,4%), respectivamente, observando un menor número de ingresos en 2020 (p=  0,018). El número de horas de evolución hasta la consulta en Urgencias del total de pacientes no demostró diferencias, únicamente existió un aumento en los pacientes con patología apendicular en el periodo de 2020, 24 [23-48] respecto al periodo del año previo 24 [12-30] (p=  0,045). CONCLUSION: La situación actual de pandemia no ha provocado una disminución del número de intervenciones quirúrgicas urgentes. Únicamente aumentó el tiempo hasta la consulta en los pacientes con patología apendicular.


Subject(s)
COVID-19/epidemiology , Emergency Service, Hospital/statistics & numerical data , Pandemics , Pediatrics/statistics & numerical data , Surgery Department, Hospital/statistics & numerical data , Abdominal Pain/epidemiology , Appendicitis/epidemiology , Appendicitis/surgery , Child , Female , Hospitalization/statistics & numerical data , Humans , Male , Retrospective Studies , Tertiary Care Centers , Time-to-Treatment
3.
Cir. pediátr ; 34(2): 85-89, Abr. 2021. tab
Article in Spanish | IBECS | ID: ibc-216656

ABSTRACT

Introducción: A raíz de la aparición del virus respiratorio SARS-CoV-2 en Wuhan en diciembre de 2019, el Gobierno de España decretóel estado de alarma con medidas que han incluido el confinamiento do-miciliario. El objetivo de este trabajo es analizar la actividad urgente deun Servicio de Cirugía Pediátrica referente en su Comunidad Autónomay comprobar si ha existido disminución o no en la patología quirúrgica. Métodos: Estudio retrospectivo de los pacientes pediátricos queacudieron a Urgencias y fueron derivados a Cirugía Pediátrica entre losperiodos del 14 de marzo hasta el 20 de abril de 2020, comparándoloscon aquellos que acudieron en las mismas fechas del año previo. Seanalizaron variables demográficas, la patología y el tipo de manejoen cada caso. Se analizó también el número de pacientes con dolorabdominal que precisaron valoración quirúrgica. Resultados: Se incluyeron 161 pacientes, de los que 91 acudieronen 2019 y 70 acudieron en 2020. De estos últimos, 62 (88,6%) fue-ron intervenidos y 8 (11,4%) fueron hospitalizados, mientras que en2019 fueron 67 (73,6%) y 24 (26,4%), respectivamente, observandoun menor número de ingresos en 2020 (p= 0,018). El número de horasde evolución hasta la consulta en Urgencias del total de pacientes nodemostró diferencias, únicamente existió un aumento en los pacientescon patología apendicular en el periodo de 2020, 24 [23-48] respectoal periodo del año previo 24 [12-30] (p= 0,045). Conclusión: La situación actual de pandemia no ha provocadouna disminución del número de intervenciones quirúrgicas urgentes.Únicamente aumentó el tiempo hasta la consulta en los pacientes conpatología apendicular.(AU)


Introduction: As a result of the emergence of the SARS-CoV-2respiratory virus in Wuhan in December 2019, the Spanish Governmentdeclared the state of emergency with restrictions such as stay-at-homelockdown. The objective of this study was to analyze emergency activityat a referral pediatric surgery unit in its territory and determine whethersurgical pathologies had decreased or not. Methods: A retrospective study of pediatric patients presentingat the emergency department and referred to the pediatric surgery unitfrom March 14, 2020 to April 20, 2020 was carried out. The resultswere compared with those from the same dates of the previous year.Demographic variables, pathologies, and management strategies werestudied for each case. The number of patients with abdominal painrequiring surgical assessment was also analyzed. Results: 161 patients were included – 91 from 2019 and 70 from2020. Of the 2020 patients, 62 (88.6%) underwent surgery and 8 (11.4%)were admitted, whereas in 2019, patient distribution was 67 (73.6%)and 24 (26.4%), which means there were fewer admissions in 2020(p= 0.018). There were no differences in terms of hours to emergencydepartment consultation – just an increase in the case of appendicularpathologies in the 2020 period, with 24 [23-48] hours vs. 24 [12-30]hours (p = 0.045). Conclusion: The current pandemic has not caused emergency sur-geries to decrease. It has only increased time to consultation in patientswith appendicular pathologies.(AU)


Subject(s)
Humans , Male , Female , Child , Pandemics , Severe acute respiratory syndrome-related coronavirus , Coronavirus Infections/epidemiology , Emergencies , Pediatrics , Spain , General Surgery , Retrospective Studies
4.
Actas Dermosifiliogr ; 2021 Nov 23.
Article in English, Spanish | MEDLINE | ID: mdl-36244830

ABSTRACT

The Publisher regrets that this article is an accidental duplication of an article that has already been published, https://doi.org/10.36959/472/363. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal.

5.
An Pediatr (Engl Ed) ; 93(2): 118-122, 2020 Aug.
Article in English | MEDLINE | ID: mdl-32837965

ABSTRACT

INTRODUCTION: Acute appendicitis (AA) is the most common abdominal surgical emergency. No specific studies have been found that evaluate the impact of the coronavirus 2 (SARS-Cov-2) pandemic on AA and its surgical management. An analysis was made on the influence of this new pathology on the clinical course of AA. MATERIAL AND METHODS: Retrospective observational study was conducted on patients operated on for AA from January to April 2020. They were classified according to the time of the appendectomy, before the declaration of the state of alarm (Pre-COVID-19), and after its declaration (Post-COVID-19) in Spain, one the most affected countries in the world. An evaluation was made of demographic variables, duration of symptoms, type of appendicitis, surgical time, hospital stay, and postoperative complications. RESULTS: The study included 66 patients (41 Pre-COVID-19; 25 Post-COVID-19) with mean age of 10.7 ±â€¯3 and 9.3 ±â€¯3.1; P = .073, respectively. Fever was found in a higher number of post-COVID-19 patients (52 vs 19.5%; P = .013), as well as a higher CRP (72.7 ±â€¯96.2 vs 31.3 ±â€¯36.2 mg/dL; P = .042). This group presented with a higher proportion of complicated appendicitis when compared to Pre-COVID-19 (32 vs 7.3%; P = .015). The mean hospital stay was longer in the Post-COVID-19 group (5.6 ±â€¯5.9 vs 3.2 ±â€¯4.3 days; P = .041). No differences were found in the time of onset of symptoms or surgical time. CONCLUSIONS: The SARS-Cov-2 pandemic influenced the time of diagnosis of appendicitis, as well as its course, and mean hospital stay. Peritonitis was more frequently seen. As a result of the significant circumstances, delaying diagnosis and treatment of AA during SARS-Cov-2 pandemic, inappropriate management of this common surgical disorder has been noticed.


INTRODUCCIÓN: La apendicitis aguda (AA) es la urgencia quirúrgica abdominal más frecuente. No encontramos estudios específicos que evalúen el impacto de la pandemia causada por el coronavirus 2 (SARS-Cov-2) sobre la AA y su tratamiento quirúrgico. Analizamos la influencia de esta nueva patología sobre la AA. MATERIAL Y MÉTODOS: Estudio observacional retrospectivo en pacientes intervenidos por AA desde enero hasta abril de 2020. Fueron clasificados según el momento de la apendicectomía, antes de la declaración del estado de alarma (Pre-COVID19) y después de la declaración del estado de alarma (Post-COVID19) en España. Se evaluaron variables demográficas, duración de la sintomatología, tipo de apendicitis, tiempo quirúrgico, estancia hospitalaria y complicaciones postoperatorias. RESULTADOS: Se incluyeron 66 pacientes (41 Pre-COVID19; 25 Post-COVID19 con edad media de 10.7 ±â€¯3 y 9.3 ±â€¯3.1; P = .073; respectivamente). La fiebre se encontró en un mayor número de pacientes post-COVID19 (52 vs 19.5%; P = .013), así como una PCR más elevada (72.7 ±â€¯96.2 vs 31.3 ±â€¯36.2 mg/dl; P = .042). Este grupo presentó una mayor proporción de apendicitis complicada al compararle con el Pre-COVID19 (32 vs 7.3%; P = .015). La estancia media hospitalaria fue mayor en el grupo Post-COVID19 (5.6 ±â€¯5.9 vs 3.3 ±â€¯4.3 días; P = .041). No se encontraron diferencias en el tiempo de evolución de los síntomas ni en el tiempo quirúrgico. CONCLUSIONES: La pandemia por SARS-Cov-2 influye en el momento de diagnóstico de la apendicitis, así como en su grado de evolución y estancia hospitalaria. La peritonitis fue lo más frecuentemente observado. Una sospecha y orientación clínica más temprana, es necesaria para evitar un manejo inadecuado de este trastorno quirúrgico común.

8.
Rev. esp. med. nucl. (Ed. impr.) ; 24(2): 113-126, mar.-abr. 2005. ilus, tab, graf
Article in Es | IBECS | ID: ibc-037384

ABSTRACT

Objetivo: La detección de la recurrencia secundaria a cáncer de ovario es un problema de importancia notoria, pudiendo mediante un diagnóstico correcto ofrecer alternativas útiles en el manejo de las pacientes. El objetivo de este estudio ha sido valorar el impacto terapéutico de la PET-FDG en la recurrencia por cáncer de ovario. Material y métodos: Se han incluido 43 enfermas con cáncer de ovario en las que se efectuó el estudio PET-FDG ante la sospecha diagnóstica de recidiva. Los resultados de la PET-FDG se confirmaron por histopatología y seguimiento clínico mayor de 12 meses. Se ha comparado el impacto en el manejo de las pacientes basado en los métodos convencionales de imagen, con el plan de tratamiento considerando los hallazgos de la PET-FDG, clasificando el impacto de la PET-FDG como alto, medio, bajo o no impacto. Los cambios en el manejo terapéutico de las enfermas, han sido clasificados como intermodalidad o intramodalidad. Resultados: El estudio PET-FDG obtuvo un impacto alto en el manejo terapéutico de 28 pacientes (65,1 %), un impacto medio en 2 pacientes (4,6 %), un impacto bajo en 9 pacientes (20,9 %), y no tuvo impacto en 4 enfermas (9,3 %). La PET-FDG indujo un cambio intermodalidad en 27 pacientes (62,8 %); un cambio intramodalidad en 3 pacientes (7 %); y finalmente en 13 enfermas (30,2 %), no produjo ningún cambio en el tratamiento. Conclusiones: La PET-FDG proporciona una información adicional con respecto a los métodos diagnósticos de imagen convencional, permitiendo efectuar cambios en el manejo terapéutico en la mayoría de las enfermas


Aim: Recurrent ovarian cancer is a major problem and an accurate diagnosis can often change patients' management. This study aimed to assess the impact on management of FDG-PET in recurrent ovarian cancer. Material and methods: Forty-three patients in whom FDG-PET scan was performed due to suspected recurrent ovarian cancer were included. FDG-PET results were confirmed by histopathology and clinical follow-up of at least 12 months. To assess impact on management the treatment plan based on conventional imaging methods was compared with the treatment plan based on inclusion of PET findings, classifying FDG-PET impact on management as high, medium, low or no impact. Management changes, when present, were classified as intermodality or intramodality. Results: FDG-PET had a high impact on therapeutic management in 28 patients (65.1 %), medium impact in 2 patients (4.6 %), low impact in 9 patients (20.9 %), and no impact in 4 patients (9.3 %). FDG-PET induced an intermodality change in management in 27 patients (62,8 %); intramodality changes were induced in 3 patients (7 %). Finally, it produced no treatment changes in 13 patients (30.2 %). Conclusion: FDG-PET supplied additional information when compared to conventional diagnostic procedures and allowed adequate management changes in most patients


Subject(s)
Female , Adult , Aged , Humans , Tomography, Emission-Computed , Radiopharmaceuticals , Fluorodeoxyglucose F18 , Neoplasm Recurrence, Local , Ovarian Neoplasms , Ovarian Neoplasms/therapy , Retrospective Studies
9.
Phys Rev Lett ; 94(7): 076101, 2005 Feb 25.
Article in English | MEDLINE | ID: mdl-15783828

ABSTRACT

The experimental study of the thermodynamic and kinetic properties of the Sb/Si(111) interface reveals a surprising behavior: a 2D phase condensates when the Sb coverage increases, indicating strong attractive Sb-Sb interactions, whereas the isotherms present a quasi-Langmuir shape, suggesting that these interactions should be negligible. Ab initio calculations raise this contradiction: while the adsorption site evolves from ternary towards the on-top position with increasing coverage, the character of the Sb-Sb effective interactions changes from repulsive towards attractive, resulting in an almost constant average adsorption energy. A simple (Langmuir) thermodynamic behavior can then be the consequence of a surface phase transition.

10.
Rev Esp Med Nucl ; 24(2): 113-26, 2005.
Article in Spanish | MEDLINE | ID: mdl-15745682

ABSTRACT

AIM: Recurrent ovarian cancer is a major problem and an accurate diagnosis can often change patients' management. This study aimed to assess the impact on management of FDG-PET in recurrent ovarian cancer. MATERIAL AND METHODS: Forty-three patients in whom FDG-PET scan was performed due to suspected recurrent ovarian cancer were included. FDG-PET results were confirmed by histopathology and clinical follow-up of at least 12 months. To assess impact on management the treatment plan based on conventional imaging methods was compared with the treatment plan based on inclusion of PET findings, classifying FDG-PET impact on management as high, medium, low or no impact. Management changes, when present, were classified as intermodality or intramodality. RESULTS: FDG-PET had a high impact on therapeutic management in 28 patients (65.1 %), medium impact in 2 patients (4.6 %), low impact in 9 patients (20.9 %), and no impact in 4 patients (9.3 %). FDG-PET induced an intermodality change in management in 27 patients (62,8 %); intramodality changes were induced in 3 patients (7 %). Finally, it produced no treatment changes in 13 patients (30.2 %). CONCLUSION: FDG-PET supplied additional information when compared to conventional diagnostic procedures and allowed adequate management changes in most patients.


Subject(s)
Fluorodeoxyglucose F18 , Neoplasm Recurrence, Local/diagnostic imaging , Ovarian Neoplasms/diagnostic imaging , Ovarian Neoplasms/therapy , Positron-Emission Tomography , Radiopharmaceuticals , Adult , Aged , Female , Humans , Middle Aged , Retrospective Studies
11.
An Med Interna ; 21(1): 12-6, 2004 Jan.
Article in Spanish | MEDLINE | ID: mdl-15195479

ABSTRACT

OBJECTIVE: Fluorine-18 deoxyglucose Positron Emission Tomography (FDG-PET) is a non-invasive technique that offers the possibility to define if the radiologically indetermined pulmonary lesions are benign or malignant with high positive and negative predictive values. Considering the indexed literature we can observe that there are few original studies performed with the diagnostic possibilities of our means. For this reason, our main objective is to evaluate the diagnostic accuracy of positron emission tomography in sixty-seven radiologically indetermined pulmonary nodular lesions. MATERIAL AND METHOD: Retrospectively, we evaluated the diagnostic ability of FDG-PET globally (by means of visual and semiquantitative analysis) and partially (only considering the Standardized Uptake Value (SUV)), in sixty-seven patients confirmed by pathology or clinical and radiological monitoring, in a time interval superior to one year. RESULTS: Globally, FDG-PET had a sensitivity (S) of 92%, specificity (SP) of 86.6%, positive predictive value (PPV) of 89.4%, negative predictive value (NPV) of 89.6% and diagnostic accuracy (DA) of 89%. The best results were obtained for an SUV equal or superior to 2.5. With this value, the clinical efficacy parameters were: S 0.92, SP 0.90, PPV 0.92, NPV 0.90 and DA 0.91. CONCLUSIONS: We can characterize most of the radiologically indetermined pulmonary lesions by FDG-PET. The additional use of SUV facilitates an increase in the positive predictive value and specificity of FDG-PET.


Subject(s)
Fluorodeoxyglucose F18 , Lung Neoplasms/diagnostic imaging , Radiopharmaceuticals , Solitary Pulmonary Nodule/diagnostic imaging , Tomography, Emission-Computed , Adult , Aged , Diagnosis, Differential , False Negative Reactions , Female , Humans , Lung Diseases/diagnostic imaging , Lung Neoplasms/secondary , Male , Middle Aged , Predictive Value of Tests , Radiography , Retrospective Studies , Sensitivity and Specificity
13.
An. med. interna (Madr., 1983) ; 21(1): 12-16, ene. 2004.
Article in Es | IBECS | ID: ibc-29902

ABSTRACT

Objetivo: La Tomografía por Emisión de Positrones con 18-fluoro-2desoxi-D-glucosa (PET-FDG) es una técnica no-invasiva, que nos ofrece la posibilidad de caracterizar la benignidad o malignidad de las lesiones pulmonares (NPS) radiológicamente indeterminadas, con un elevado valor predictivo negativo y positivo. Observando las publicaciones indexadas podemos apreciar que son escasas las realizadas con las posibilidades diagnósticas de PET-FDG. Por eso, nuestro objetivo es analizar la exactitud diagnóstica (ED), de la PET en nuestra experiencia con 67 pacientes con lesiones nodulares radiológicamente indeterminadas. Material y método: retrospectivamente, se ha valorado la aportación diagnóstica de la PET, de forma global (mediante análisis visual y semicuantitativo) y parcial (considerando únicamente el valor del SUV), en 67 pacientes con NPS radiológicamente indeterminado, efectuando la comprobación diagnóstica por anatomía patológica o seguimiento clínico-radiológico de duración superior a un año. Resultados: Globalmente, la PET-FDG obtuvo una sensibilidad (S) del 92 por ciento, una especificidad (E) del 86,6 por ciento, un valor predictivo positivo (VPP) del 89.4 por ciento, un valor predictivo negativo (VPN) del 89,6 por ciento y una exactitud diagnóstica (ED) del 89 por ciento. Los mejores resultados se obtuvieron para un SUV (Standardized Uptake Value) igual o superior a 2,5, con una S de 92 por ciento, E de 90 por ciento, VPP 92 por ciento, VPN 90 por ciento y ED 91 por ciento. Conclusiones: Podemos caracterizar la mayoría de las lesiones pulmonares indeterminadas mediante la PET-FDG. El uso adicional del SUV posibilita aumentar el valor predictivo positivo y la especificidad de la técnica PET (AU)


Subject(s)
Middle Aged , Male , Humans , Female , Adult , Aged , Tomography, Emission-Computed , Sensitivity and Specificity , Retrospective Studies , Radiopharmaceuticals , False Negative Reactions , Diagnosis, Differential , Solitary Pulmonary Nodule , Lung Neoplasms , Predictive Value of Tests , Lung Diseases , Fluorodeoxyglucose F18
14.
Rev Esp Med Nucl ; 21(6): 403-9, 2002.
Article in Spanish | MEDLINE | ID: mdl-12425887

ABSTRACT

OBJECTIVE: The objective of this work was to assess the Standardized Uptake Value (SUV) in the differential diagnosis of radiologically indeterminate lung lesions by means of ROC curves. MATERIAL AND METHOD: Forty seven patients were studied by Positron Emission Tomography with 18-fluorine-2-desoxy-D-glucose (FDG PET) analyzing the value of maximum SUV. The patients were classified into three groups. Group 1 = patients without previous neoplasia (WPN) + patients with previous neoplasia (PN). Group 2 = WPN. Group 3 = PN. RESULTS: The ROC curves showed a high diagnostic accuracy in the three groups, with area under the curve (AUC) values of 0.96, 0.98 and 0.91 respectively. The typical error was 0.03, 0.02 and 0.08. The maximum SUV cutoffs with the best diagnostic accuracy for the three groups were: 2.6; 3 and 2.4, with an accuracy (A) of 93.6%, 97% and 92.3%, respectively. Analyzing all the patients globally (group 1), we obtained one false positive result in a patient with hamartoma (max SUV = 2.8) and two false negative results in one patient with lung metastases from malignant fibrohistiocytoma (max SUV = 0.7) and in another patient with lung metastases from unknown origin adenocarcinoma (max SUV = 1.9). CONCLUSIONS: FDG PET permits differentiation with a very high diagnostic accuracy of benign and malignant lung lesions using the maximum SUV. The differences observed between the different groups are due to the different disease prevalence, obtaining a lower negative predictive value of max SUV in patients with previous neoplasia.


Subject(s)
ROC Curve , Solitary Pulmonary Nodule/diagnostic imaging , Tomography, Emission-Computed , Adult , Aged , Carcinoma, Non-Small-Cell Lung/diagnostic imaging , Carcinoma, Small Cell/diagnostic imaging , Diagnosis, Differential , Female , Fluorodeoxyglucose F18 , Hamartoma/diagnostic imaging , Humans , Lipoma/diagnostic imaging , Lung Diseases/diagnostic imaging , Lung Neoplasms/diagnostic imaging , Lung Neoplasms/secondary , Male , Middle Aged , Pneumonia/diagnostic imaging , Predictive Value of Tests , Radiography , Radiopharmaceuticals , Tomography, Emission-Computed/statistics & numerical data , Tuberculoma/diagnostic imaging
15.
Rev. esp. med. nucl. (Ed. impr.) ; 21(6): 403-409, nov. 2002.
Article in Es | IBECS | ID: ibc-17457

ABSTRACT

Objetivo: El objetivo de este trabajo ha sido estudiar el valor del 'Standardized Uptake Value' (SUV) en el diagnóstico diferencial de lesiones pulmonares radiológicamente indeterminadas mediante CURVAS ROC. Material y método: Se han estudiado mediante tomografía por emisión de positrones con 18-fluoro-2-desoxi-Dglucosa (PET- FDG) un total de 47 pacientes analizando el valor del SUV máximo. Los enfermos han sido agrupados de la siguiente forma: grupo 1 = pacientes sin antecedentes de neoplasia (PSAN) + pacientes con antecedentes de neoplasia (PCAN); grupo 2 = PSAN; grupo 3 = PCAN. Resultados: En los tres grupos analizados las CURVAS ROC muestran unos valores del Área Bajo la Curva (ABC) para los grupos 1, 2 y 3, de: 0,96, 0,98 y 0,91. Los puntos de corte de mayor exactitud diagnóstica fueron para el grupo 1, 2, y 3 de: 2,6; 3 y 2,4, con una exactitud diagnóstica (ED) del 93,6 per cent, 97 per cent y 92,3 per cent, respectivamente. Analizando globalmente todos los pacientes (grupo 1), sólo hemos obtenido un resultado falso positivo en un paciente con un hamartoma (SUV de 2,8) y dos resultados falsos negativos en dos casos de metástasis pulmonares secundarias a: fibrohistiocitoma maligno (SUV 0,7) y adenocarcinoma de origen desconocido (SUV 1,9). Conclusiones: La FDG-PET permite diferenciar lesiones pulmonares benignas de malignas mediante la obtención del SUV con una elevada exactitud diagnóstica. Las diferencias observadas entre los grupos analizados se atribuyen a la diferente prevalencia de enfermedad, identificándose en los enfermos con antecedentes de neoplasia primaria un menor valor predictivo negativo del SUV (AU)


Subject(s)
Middle Aged , Aged , Adult , Male , Female , Humans , ROC Curve , Tomography, Emission-Computed , Tuberculoma , Radiopharmaceuticals , Pneumonia , Solitary Pulmonary Nodule , Diagnosis, Differential , Lipoma , Hamartoma , Carcinoma, Small Cell , Predictive Value of Tests , Fluorodeoxyglucose F18 , Carcinoma, Non-Small-Cell Lung , Lung Neoplasms , Lung Diseases , Fluorodeoxyglucose F18
16.
Oncología (Barc.) ; 25(6): 330-334, jun. 2002. ilus
Article in Es | IBECS | ID: ibc-13825

ABSTRACT

Propósito: Las metástasis cerebrales constituyen el tipo más común de tumor cerebral en adultos, causando un incremento de morbilidad y mortalidad en pacientes con cáncer. En la actualidad el tratamiento electivo en la mayoría de los casos es la radiocirugía.• Material y métodos: Presentamos la valoración de la respuesta a la radiocirugía mediante tomografía por emisión de positrones (PET) y resonancia magnética nuclear (RMN) en un paciente con hidrocefalia y metástasis cerebrales (circunstancia excepcional en la práctica asistencial diaria). • Resultados: Ambas exploraciones PET-FDG y RMN identificaron las lesiones metastásicas cerebrales, detectándose mediante PET la afectación multiorgánica del carcinoma de pulmón. La respuesta a la radiocirugía, en este caso la viabilidad tumoral persistente, fue valorada correctamente por PET- FDG. • Conclusiones: Creemos que es necesario una utilización conjunta de la PET y de la RMN como método óptimo y complementarios para estimar con mayor exactitud el grado de respuesta a la radiocirugía en el tratamiento de las metástasis cerebrales. (AU)


Subject(s)
Adult , Male , Humans , Hydrocephalus , Lung Neoplasms/pathology , Brain Neoplasms/secondary , Tomography, Emission-Computed , Radiosurgery , Fatal Outcome , Magnetic Resonance Spectroscopy , Neoplasm Metastasis
18.
Rev Med Univ Navarra ; 39(3): 130-5, 1995.
Article in Spanish | MEDLINE | ID: mdl-8552915

ABSTRACT

In the present work we report a study of the basal gastrin serum levels and stimulated serum gastrin levels after an hyperproteic meal, in a group of 20 healthy volunteers, with neither actual nor previous digestive symptoms. 60% were males, with a mean age of 35, 7 years, the highest percentage (40%) belonging to the fourth decade of life. The procedure used to determine serum gastrin levels is described. The mean value of the 3 samples obtained in basal conditions was of 51.01 pg/ml. The mean value of the 6 samples obtained after the stimulation meal was of 73.4 pg/ml. The results obtained in this study are discussed and compared with the ones of the reviewed literature.


Subject(s)
Gastrins/blood , Adolescent , Adult , Aged , Dietary Proteins/administration & dosage , Eating , Female , Gastrins/metabolism , Humans , Male , Middle Aged , Radioimmunoassay , Reference Values
19.
Plant Cell Rep ; 14(5): 310-3, 1995 Feb.
Article in English | MEDLINE | ID: mdl-24186766

ABSTRACT

Somatic embryogenesis was induced in hypocotyls of Digitalis obscura using indoleacetic acid or 2,4-dichlorophenoxyacetic acid with different culture and subculture conditions. Indoleacetic acid-induced embryogenic cultures were used to investigate the effects of amino acids, polyamines and growth regulators on embryo differentiation and maturation. Supplementation of the media with amino acids, polyamines or abscisic acid did not influence or had an adverse effect on embryogenic response. Gibberellic acid at 1.4 µM in either culture (30 days) or subculture medium was effective in promoting both differentiation and normal embryo development. The efficiency of somatic embryogenesis was greatly enhanced when isolated indoleacetic acid-induced proembryogenic masses were subcultured in liquid medium with reduced auxin content.

20.
Rev Esp Enferm Dig ; 82(5): 305-10, 1992 Nov.
Article in Spanish | MEDLINE | ID: mdl-1485981

ABSTRACT

Serum gastrin levels were measured under basal conditions and after hyperproteic meal stimulation in 24 patients with non-stenotic duodenal ulcer, 78% of them were males with a mean age of 36.4 years. Results were compared with those obtained in 20 volunteers. Basal gastrin levels in patients with duodenal ulcer 46.2 +/- 17.5 pg/ml did not show any significant statistical differences when compared with those in the control group (51.01 +/- 28.1 pg/ml). After meal stimulation gastrin levels at different time intervals, were similar in patients with duodenal ulcer and in the control group. We conclude that serum gastrin does not seem to play a relevant pathogenic role in the development of duodenal ulcer; its measurement is of no value as a biological marker of duodenal ulcer disease.


Subject(s)
Duodenal Ulcer/blood , Gastrins/blood , Adult , Basal Metabolism , Dietary Proteins/metabolism , Duodenal Ulcer/metabolism , Eating , Female , Gastrins/metabolism , Humans , Male , Middle Aged
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