[Renal tumors percutaneous ablation by microwave. Initial experience.] / Ablación percutánea por microondas de tumores renales. Experiencia inicial.

OBJECTIVE: To analyze retrospectively the safety and effectiveness of percutaneous microwave ablation of solid renal tumors, and also review different approach techniques. METHODS: It is a retrospective study approved by the ethics committee of both hospitals. 14 tumors with a mean size of 37 mm (12-50 mm) were treated in a single session, under general anesthesia and with CT guidance, in 14 patients (9 men) with a mean age of 66 years, using the ablation system AMICA by different approaches (trans pulmonary, trans peritoneal and retroperitoneal). A biopsy was performed with a core needle to 13 of them prior to ablation in the same session. CT abdominal follow-up was performed (with and without i.v. contrast) at 1, 3, 6, 12, 18 and 24 months after ablation. Changes in serum creatinine levels pre- and post-ablation were also analyzed. RESULTS: The average follow-up time was 16.5 months (3-28 months) and we obtained complete response in 100% of the treated tumors. Only two minor complications were observed: one self-limited perirenal hemorrhage and one asymptomatic hydronephrosis, in the two patients to whom we did a transpulmonary approach, without pneumothorax in any of them. CONCLUSION: Percutaneous ablation of renal tumors seems to be a safe and effective technique, either via transpulmonary, transperitoneal or retroperitoneal approach, depending on tumor location. KEY POINTS: • Microwave ablation produces coagulation necrosis. • The sink effect is smaller in microwave ablation. • Microwave ablation seems to be safe and effective. • The type of approach is not correlated with major complications (Clavien > o =II).

Ablación percutánea por microondas de tumores renales. Experiencia inicial / Renal tumors percutaneous ablation by microwave. Initial experience

OBJETIVO: Analizar retrospectivamente la seguridad y eficacia de la ablación percutánea por microondas de tumores sólidos renales, así como revisar diferentes técnicas de abordaje. MÉTODOS: Es un estudio retrospectivo aprobado por el comité de ética de ambos hospitales en donde se trató en una única sesión, con anestesia general y con guía por TC 14 tumores con tamaño promedio de 37mm (12-50mm, desviación estandar 10,9) en 14 pacientes (9 varones) con una edad media de 66 años y con el sistema de ablación AMICA por diferentes vías de abordaje (transpulmonar, transperitoneal y retroperitoneal). En 13 de ellos se realizó previo a la ablación y en la misma sesión biopsia con aguja gruesa. Se realizó seguimiento mediante TC abdominal (sin y con contraste i.v.) al mes de la ablación y posteriormente a los 3, 6, 12, 18 y 24 meses posterior a la ablación. Se analizó también la modificación de los niveles de creatinina sérica pre- y post-ablación. RESULTADOS: El tiempo medio de seguimiento fue de 16,5 meses (3-28 meses) y obtuvimos respuesta completa en el 100% de los tumores tratados con tasa de supervivencia global del 100% a los 2 años y de supervivencia libre de la enfermedad del 100% a los 3 meses del tratamiento sin aparición de metástasis en las imágenes de seguimiento. Sólo observamos dos complicaciones menores Clavien-Dindo I: hemorragia perirrenal autolimitada e hidronefrosis asintomática, en los dos pacientes donde realizamos abordaje transpulmonar, sin neumotórax en ninguno de ellos. CONCLUSIÓN: La ablación percutánea de tumores renales parece una técnica segura y eficaz, ya sea por vía transpulmonar, transperitoneal o retroperitoneal según la localización del tumor. Puntos Clave: · La ablación con microondas produce necrosis por coagulación. · El efecto de sumidero es menor en la ablación con microondas. · La ablación con microondas parece ser segura y efectiva. · El tipo de abordaje no se correlaciona con complicaciones mayores (Clavien>o = II)

OBJECTIVE: To analyze retrospectively the safety and effectiveness of percutaneous microwave ablation of solid renal tumors, and also review different approach techniques. METHODS: It is a retrospective study approved by the ethics committee of both hospitals. 14 tumors with a mean size of 37 mm (12-50 mm) were treated in a single session, under general anesthesia and with CT guidance, in 14 patients (9 men) with a mean age of 66 years, using the ablation system AMICA by different approaches (trans pulmonary, trans peritoneal and retroperitoneal). A biopsy was performed with a core needle to 13 of them prior to ablation in the same session. CT abdominal follow-up was performed (with and without i.v. contrast) at 1, 3, 6, 12, 18 and 24 months after ablation. Changes in serum creatinine levels pre- and post-ablation were also analyzed. RESULTS: The average follow-up time was 16.5 months (3-28 months) and we obtained complete response in 100% of the treated tumors. Only two minor complications were observed: one self-limited perirenal hemorrhage and one asymptomatic hydronephrosis, in the two patients to whom we did a transpulmonary approach, without neumothorax in any of them. CONCLUSION: Percutaneous ablation of renal tumors seems to be a safe and effective technique, either via transpulmonary, transperitoneal or retroperitoneal approach, depending on tumor location

Arterial Calcium Stimulation with Hepatic Venous Sampling in the Localization Diagnosis of Endogenous Hyperinsulinism.

Objective. The aim of this study was to assess the utility of arterial calcium stimulation with hepatic venous sampling (ASVS) in the localization diagnosis of endogenous hyperinsulinism. Patients and Methods. A retrospective descriptive study was performed including patients with endogenous hyperinsulinism who underwent ASVS. The histopathological diagnosis in patients who underwent a surgical procedure was used as the reference for the statistical study of the accuracy of this technique. Results. 30 patients were included with endogenous hyperinsulinism and nonconclusive imaging diagnosis was included. ASVS was performed in all cases. Surgery was performed in 20 cases. Insulinoma was removed in 19 patients; the location of all cases was detected in the ASVS. All cases of endogenous hyperinsulinism had a positive result for the ASVS, with this association being statistically significant (χ2 = 15.771; p < 0.001). A good and statistically significant agreement was obtained between histopathologic diagnosis and ASVS results (K = 0.518, p < 0.001). Conclusions. ASVS is a useful procedure in the localization diagnosis of endogenous hyperinsulinism undetected by other imaging tests. This technique allows the localization of intrapancreatic insulinomas and represents useful tool for the diagnosis and surgical management of these tumors.

[Usefulness of arterial calcium stimulation with hepatic venous sampling in the localization diagnosis of endogenous hyperinsulinism]. / Valoración de la utilidad del test de estimulación intraarterial con calcio en el diagnóstico de localización del hiperinsulinismo endógeno.

BACKGROUND AND OBJECTIVE: The aim of this study was to assess the utility of arterial calcium stimulation with hepatic venous sampling (ASVS) in the localization of tumors in patients with endogenous hyperinsulinism not detected with other methods. PATIENTS AND METHODS: We performed a retrospective study of 26 patients admitted to our hospital for hypoglycemia who underwent ASVS because the source of hyperinsulinism was not clearly identified by other imaging techniques. The histopathological result in patients who underwent a surgical procedure was considered the reference for statistical study of the accuracy of this technique. Statistical analysis was performed by comparing proportions with the chi-squared test with Yates' correction for contingency tables, and Cohen's kappa coefficient as a measure of interrater agreement between two observations. RESULTS: Surgery was performed in 17 patients, 13 with positive ASVS and the remaining four with negative results. An insulinoma was removed in 12 patients, and 10 of these were detected in the ASVS. A total of 76.9 % of positive ASVS tests corresponded to a histological diagnosis of insulinoma, and 83% of these insulinomas were positive in ASVS. This association was statistically significant (chi cuadrado=7.340; p=0.012). Two of three patients with nesidioblastosis had a positive response in the ASVS. A good and statistically significant agreement was obtained between histopathologic diagnosis and ASVS results (kappa=0.556, p = 0.007). CONCLUSIONS: ASVS is a useful procedure in the localization diagnosis of endogenous hyperinsulinism not detected by other imaging tests. This technique allows tumors in the pancreatic gland to be identified and may be useful in the choice of the surgical technique to be used.

Valoracion de la utilidad del test de estimulacion intraarterial con calcio en el diagnostico de localizacion del hiperinsulinismo endogeno / Usefulness of arterial calcium stimulation with hepatic venous sampling in the localization diagnosis of endogenous hyperinsulinism

Antecedentes y objetivo El objetivo de este estudio fue valorar la utilidad del test de estimulación intraarterial con calcio (TEIC) en el diagnostico de localización del hiperinsulinismo endogeno no detectado por otros métodos. Pacientes y métodos Estudio retrospectivo de 26 pacientes ingresados por hipoglucemias en los que se realizo un TEIC, ya que la localización del hiperinsulinismo no fue claramente establecida con otras técnicas de imagen. En los pacientes que recibieron cirugía se pudo establecer el diagnostico anatomopatologico, y este se considero el patrón de referencia para la validación del TEIC. El análisis estadístico se realizo mediante la comparación de proporciones por el test chi-cuadrado con corrección de Yates para tablas de contingencia y el coeficiente (..) (AU)

Background and objective The aim of this study was to assess the utility of arterial calcium stimulation with hepatic venous sampling (ASVS) in the localization of tumors in patients with endogenous hyperinsulinism not detected with other methods. Patients and methods We performed a retrospective study of 26 patients admitted to our hospital for hypoglycemia who underwent ASVS because the source of hyperinsulinism was not clearly identified by other imaging techniques. The histopathological result in patients who underwent a surgical procedure was considered the reference for statistical study of the accuracy of this technique. Statistical analysis was performed by comparing proportions with the chi-squared test with Yates¡¯ correction for contingency tables, and Cohen¡äs kappa coefficient as a measure of interrater agreement between two observations. Results Surgery was performed in 17 patients, 13 with positive ASVS and the remaining four with negative results. An insulinoma was removed in 12 patients, and 10 of these were detected in the ASVS. A total of 76.9 % of positive ASVS tests corresponded to a histological diagnosis of insulinoma, and 83% of these insulinomas were positive in ASVS. This association was statistically significant (chi cuadrado=7.340; p=0.012). Two of three patients with nesidioblastosis had a positive response in the ASVS. A good and statistically significant agreement was obtained between histopathologic diagnosis and ASVS results (¦Ê=0.556, p = 0.007).Conclusions ASVS is a useful procedure in the localization diagnosis of endogenous hyperinsulinism not detected by other imaging tests. This technique allows tumors in the pancreatic gland to be identified and may be useful in the choice of the surgical technique to be used (AU)

Obstruction in patients with colorectal cancer increases morbidity and mortality in association with altered nutritional status.

Intestinal obstruction aggravates the prognosis of colorectal cancer (CRC) patients. The aim of this study was to carry out a comparative analysis of nutritional status and inflammatory response in CRC patients with or without intestinal obstruction. The study was carried out on 43 patients with CRC. Twenty-three of these patients had intestinal obstruction. Anthropometric measurements, serum protein content, acute phase reactants, and diagnostic and risk nutritional indices were analyzed. The presence of intestinal obstruction reduced albumin (31 +/- 5.2 vs. 36 +/- 4.2 g/l; P = 0.0025) and prealbumin (0.13 +/- 0.047 vs. 0.21 +/- 0.042 g/l; P = 0.0001) and increased C-reactive protein (49 +/- 43.8 vs. 14 +/- 16.7 mg/l; P = 0.006) and alpha1-antitrypsin (189 +/- 34.7 vs. 148 +/- 35.4 mg/dl; P = 0.0011). Intestinal obstruction was related to malnutrition (86% vs. 33%; P = 0.019) and Mullen's prognostic nutritional index (48 +/- 21.7 vs. 31 +/- 17.9; P = 0.038) in CRC patients. Mullen's nutritional risk index was inversely correlated to total cholesterol (r = -0.51; P = 0.0002) and albumin (r = -0.81; P = 0.0001). No correlation was found between Duke's tumor stages and acute phase response, inflammatory parameters, and malnutrition. In conclusion, intestinal obstruction occurred more frequently in CRC patients with malnutrition. The increased morbidity and mortality of CRC patients was also associated with acute phase response, inflammation, and low serum cholesterol and triglyceride concentration.