Cambios fisiopatológicos y complicaciones de las resecciones hepáticas / Physiopathological changes and complications of liver resections / Alterações fisiopatológicas e complicações das ressecções hepáticas

Las modernas técnicas quirúrgicas y anestésicas han permitido ampliar el número de intervenciones quirúrgicas a nivel hepático por diversas patologías. Logrando disminuir su moralidad pero manteniendo al día de hoy elevados niveles de morbilidad. Durante la cirugía hepática se producen cambios hemodinámicos vinculados a la movilización del hígado, a los clampeos y a las pérdidas sanguíneas independientemente de la vía de abordaje. En el postoperatorio las complicaciones o cambios fisiopatológicos derivan de las lesiones producidas por los fenómenos de isquemia y reperfusión; y aquellas producidas por la regeneración hepática. Dicha capacidad depende no solo de la cantidad de hígado remanente sino también de la posible hepatopatía preexistente. La insuficiencia hepática postoperatoria es la complicación más temida y se manifiesta con ictericia, ascitis, encefalopatía y alteraciones en la paraclínica como la hiperbilirrubinemia y descenso del tiempo de protrombina. Las complicaciones quirúrgicas dependen del procedimiento realizado y se dividen principalmente en biliares y vasculares. Las secuelas de las hepatectomías dependen de factores como el estado general del paciente, la presencia hepatopatía, el acto quirúrgico y la cantidad y calidad del hígado remanente.

Modern surgical and anesthetic techniques have made it possible to increase the number of liver surgeries for various pathologies. This has reduced morbidity but still maintains high levels of morbidity. During hepatic surgery, hemodynamic changes related to liver mobilization, clamping and blood loss occur independently of the approach route. In the postoperative period, complications or pathophysiological changes derive from the lesions produced by ischemia and reperfusion phenomena; and those produced by hepatic regeneration. This capacity depends not only on the amount of remaining liver but also on the possible pre-existing hepatopathy. Postoperative liver failure is the most feared complication and manifests with jaundice, ascites, encephalopathy and paraclinical alterations such as hyperbilirubinemia and decreased prothrombin time. Surgical complications depend on the procedure performed and are mainly divided into biliary and vascular. The sequelae of hepatectomies depend on factors such as the patient's general condition, the presence of liver disease, the surgical procedure and the quantity and quality of the remaining liver.

As modernas técnicas cirúrgicas e anestésicas tornaram possível aumentar o número de cirurgias hepáticas para várias patologias. Isto levou a uma diminuição da morbidade, mas ainda mantém altos níveis de morbidade. Durante a cirurgia hepática, ocorrem alterações hemodinâmicas ligadas à mobilização hepática, pinçamento e perda de sangue, independentemente da via de aproximação. No período pós-operatório, complicações ou alterações fisiopatológicas derivam de lesões causadas por fenômenos de isquemia e reperfusão, e aquelas causadas pela regeneração hepática. Esta capacidade depende não apenas da quantidade de fígado restante, mas também de uma possível doença hepática pré-existente. A insuficiência hepática pós-operatória é a complicação mais temida e se manifesta com icterícia, ascite, encefalopatia e alterações paraclínicas, tais como hiperbilirrubinemia e diminuição do tempo de protrombina. As complicações cirúrgicas dependem do procedimento realizado e são divididas principalmente em biliares e vasculares. As seqüelas de hepatectomias dependem de fatores como o estado geral do paciente, a presença de doença hepática, o procedimento cirúrgico e a quantidade e qualidade do fígado restante.

Resultados iniciales de un programa de cirugía hepato-bilio-pancreática laparoscópica en el Hospital Regional de Talca / Initial results of a laparoscopic hepato-biliary-pancreatic surgery program at the Regional Hospital of Talca

Resumen Introducción: La cirugía laparoscópica es la vía de abordaje de elección para el tratamiento de múltiples patologías abdominales, sin embargo, su desarrollo en la cirugía hepato-bilio-pancreática (HBP) ha sido más lento y heterogéneo. Objetivo: Presentar los resultados de la implementación y desarrollo de un programa de cirugía HBP laparoscópica en el Hospital de Regional de Talca. Materiales y Método: Estudio de serie de casos que incluye a todos los pacientes operados por una patología HBP por vía laparoscópica como acceso a la cavidad abdominal en el Hospital Regional de Talca entre el 1 de junio de 2014 y el 30 de junio de 2016. Resultados: Fueron 42 pacientes, 25 (59,5%) de sexo femenino. La mediana de edad fue 58 años (IQ25-75 38-64 años). 22 (52,4%) tuvo una cirugía abdominal previa en la mayoría de ellos por vía abierta. 22 (52,4%) pacientes fueron intervenidos por patología maligna. La indicación más frecuente fue la cirugía radical por cáncer de vesícula biliar en 10 (23,8%) casos y la hidatidosis hepática (HH) en 7 (16,7%). 1 (2,4%) paciente portador de una HH requirió de una conversión a laparotomía. 5 (11,9%) presentaron alguna morbilidad posoperatoria, 2 de ellos > III de Clavien. La mediana de recuperación funcional fue de 1 día (1-2) y la de estadía posoperatoria de 3 días (3-4). No hubo mortalidad a 90 días. Con una mediana de seguimiento de 26,5 (18-33) meses, 4 (19%) de los 21 pacientes oncológicos intervenidos con intención curativa presentaron recurrencia de la enfermedad, la mayoría de ellos sistémica y el 95% está libre de recurrencia a los 24 meses. Conclusiones: La implementación y el desarrollo de la cirugía hepato-bilio-pancreática (HBP) por vía laparoscópica puede efectuarse en hospitales de referencia regional con los mismos estándares y resultados internacionales.

Introduction: Laparoscopic surgery is the preference access for the treatment of various abdominal pathologies, however, its development in hepato-biliary-pancreatic (HBP) surgery has been slower and heterogeneous. Aim: Present the results of the implementation and development of a laparoscopic HBP surgery program at the Regional Hospital of Talca. Materials and Method: Case series study in which were included all patients submitted to laparoscopic surgery for treatment of HPB pathology as access to the abdominal cavity in the Regional Hospital of Talca between June 1, 2014 and June 30, 2016. Results: There were 42 patients, 25 (59.5%) female. The median age was 58 years (IQ25-75 38-64 years). 22 (52.4%) had previous abdominal surgery in most of them by open route. 22 (52.4%) patients were operated on for malignant pathology. The most frequent indication was radical surgery for gallbladder cancer in 10 (23.8%) cases and hepatic hydatidosis (HH) in 7 (16.7%). 1 (2.4%) patient carrying a HH required a conversion to laparotomy. 5 (11.9%) presented some postoperative morbidity, 2 of them > Clavien III. The median functional recovery was 1 day (1-2) and the postoperative stay was 3 days (3-4). There was no mortality at 90 days. With a median follow-up of 26.5 (18-33) months, 4 (19%) of the 21 oncological patients operated on with curative intent presented recurrence of the disease, most of them systemic and 95% free from recurrence at 24 months. Conclusions: Implementation and development of HBP surgery by laparoscopy is feasible and it can be performed in regional referral hospitals with the same international standards and results.

Practical Considerations of Real Life of Hepatocellular Carcinoma in a Tertiary Center of Brazil

ABSTRACT Background. Hepatocellular carcinoma (HCC) is the most common malignancy that develops in cirrhotic livers. Its clinical and epidemiological characteristics and mortality rates vary according to geographical region. The objective of this study was to evaluate the clinical profile, epidemiological characteristics, laboratory parameters, treatment and survival of patients with HCC. Material and methods. Patients with HCC seen between 2000 and 2012 were studied. The Kaplan-Meier method was used for survival analysis according to variables in question. Results. The study included 247 patients with a mean age of 60 ± 10 years. There was a predominance of males (74%). The main etiologies of HCC were HCV infection (55%), excessive alcohol consumption (12%), and HBV infection (8%). Liver cirrhosis was present in 92% of cases. The mean tumor number and diameter were 2 and 5 cm, respectively. Patients meeting the Milan criteria corresponded to 43% of the sample. Liver transplantation was performed in 22.4% of patients of the Milan subset and in 10% of the whole sample. The overall mean survival was 60 months, with a 1-, 3- and 5-year survival probability of 74%, 40% and 29%, respectively. Lower survival was observed among patients with alcoholic etiology. Survival was higher among patients submitted to liver transplantation (P < 0.001), TACE (P < 0.001), or any kind of treatment (P < 0.001). However, no difference was found for surgical resection (P = 0.1) or sorafenib (P = 0.1). Conclusion. Patients with HCC were mainly older men diagnosed at an advanced stage. Treatment was associated with better overall survival, but few patients survived to be treated.

Complications of Liver Resection in Geriatric Patients

Abstract: Introduction and aims. Liver resection is the treatment of choice for many primary and secondary liver diseases. Most studies in the elderly have reported resection of primary and secondary liver tumors, especially hepatocellular carcinoma and colorectal metastatic cancer. However, over the last two decades, hepatectomy has become safe and is now performed in the older population, implying a paradigm shift in the approach to these patients. Material and methods. We retrospectively evaluated the risk factors for postoperative complications in patients over 65 years of age in comparison with those under 65 years of age after liver resection (n = 360). The set comprised 127 patients older than 65 years (35%) and 233 patients younger than 65 years (65%). Results. In patients younger than 65 years, there was a significantly higher incidence of benign liver tumors (P = 0.0073); in those older than 65 years, there was a significantly higher incidence of metastasis of colorectal carcinoma to the liver (0.0058). In patients older tan 65 years, there were significantly more postoperative cardiovascular complications (P = 0.0028). Applying multivariate analysis, we did not identify any independent risk factors for postoperative complications. The 12-month survival was not significantly different (younger versus older patients), and the 5-year survival was significantly worse in older patients (P = 0.0454). Conclusion. In the case of liver resection, age should not be a contraindication. An individualized approach to the patient and multidisciplinary postoperative care are the important issues.

Cirugía hepática: algunas consideraciones más allá de la técnica quirúrgica / Liver surgery: Considerations beyond the surgical technique

La mortalidad de la cirugía resectiva hepática es de 1-2%. Mejorar esto requerirá optimizar detalles que involucran a todos los encargados del cuidado de estos pacientes. El primero de estos puntos es la evaluación de la función hepática postoperatoria. Diversos métodos han sido utilizados para tratar de estimarla, sin resultados concluyentes respecto a cuál es el más adecuado. Estudios que evalúan la cantidad de parénquima residual y su relación con el desarrollo de falla hepática postoperatoria recomiendan que en presencia de un hígado sano debería quedar 20-25% del volumen hepático, 30-60% en casos de condiciones que deterioran la funcionalidad, y 40-70% en casos de cirrosis. El aporte de volumen y su relación con la morbilidad, el sangrado y el desarrollo de insuficiencia renal han sido muy estudiados. La restricción del volumen y el mantenimiento de presiones venosas bajas aparecen como estrategias recomendadas, pero no deben comprometer la perfusión sistémica. A diferencia de lo observado en pacientes críticos, especialmente sépticos, el uso de almidones aparece como una alternativa segura en pacientes sanos sometidos a procedimientos resectivos o trasplante hepático. Las alteraciones de exámenes de coagulación deben ser evaluadas y corregidas cuando corresponda, idealmente a través de métodos que permitan identificar la causa. El tromboelastograma aparece como una alternativa adecuada. La administración profiláctica de hemocomponentes no está indicada, pudiendo ser origen de morbilidad. La analgesia debe ser optimizada, siendo la peridural una buena alternativa en presencia de hígado sano y en procedimientos no mayores de una lobectomía.

The mortality of liver resection surgery is 1-2%. Improve this will require optimizing details involving all caregivers of these patients. The first of these points is the evaluation of postoperative liver function. Various methods have been used to estimate it, without conclusive results regarding what is the most appropriate. Several studies evaluating the amount of residual parenchyma and its relationship to the development of postoperative liver failure recommend that in the presence of a healthy liver should be 20-25% of liver volume, 30-60% in cases of conditions that impair the functionality and 40-70% in cases of cirrhosis. The contribution of fluids administration and its relationship with morbidity, bleeding and development of renal failure have been studied. The volume restriction, maintenance of low central venous pressures appear as recommended strategies but must not compromise systemic perfusion that can determine organ dysfunction. Unlike what was observed in critically ill patients, the use of starches appears as a safe alternative in healthy patients and those undergoing liver transplantation. Alterations in coagulation tests should be evaluated, ideally through methods that allow to identify the cause. The thromboelastography appears as a suitable alternative. Prophylactic administration of blood components is not indicated and can be a source of morbidity. Analgesia should be optimized, being epidural analgesia a good alternative in the presence of healthy liver and procedures involving no more than a lobectomy.

New concepts and outcomes for children with hepatoblastoma based on the experience of a tertiary center over the last 21 years

OBJECTIVE: The aim of this study was to summarize the experience of a tertiary center in treating hepatoblastoma for the last 21 years. PATIENTS AND METHODS: Fifty-eight cases were included. The tumor extent and prognosis were assessed using the PRETEXT system. The following data were analyzed: age at diagnosis, comorbidities, prematurity, treatment modalities, histopathological findings, surgical details and complications, treatment outcomes, chemotherapy schedules, side effects and complications. Treatment outcomes included the occurrence of local or distant recurrence, the duration of survival and the cause of death. The investigation methods were ultrasonography, CT scan, serum alpha-fetoprotein level measurement and needle biopsy. Chemotherapy was then planned, and the resectability of the tumor was reevaluated via another CT scan. RESULTS: The mean numbers of neoadjuvant cycles and postoperative cycles of chemotherapy were 6±2 and 1.5±1.7, respectively. All children except one were submitted for surgical resection, including 50 partial liver resections and 7 liver transplantations. Statistical comparisons demonstrated that long-term survival was associated with the absence of metastasis (p=0.04) and the type of surgery (resection resulted in a better outcome than transplantation) (p=0.009). No associations were found between vascular invasion, incomplete resection, histological subtype, multicentricity and survival. The overall 5-year survival rate of the operated cases was 87.7%. CONCLUSION: In conclusion, the experience of a Brazilian tertiary center in the management of hepatoblastoma in children demonstrates that long survival is associated with the absence of metastasis and the type of surgery. A multidisciplinary treatment involving chemotherapy, surgical resection and liver transplantation (including transplantations using tissue from living donors) led to good outcomes and survival indexes. .

Experiencia de diez años en resecciones hepáticas / Ten years experience in hepatic resections

Revisamos experiencia reciente y resultados obtenidos con resecciones hepáticas mayores en pacientes referidos a nuestra institución. Revisión retrospectiva de historias clínicas de pacientes entre agosto de 1998 y agosto de 2008, con el objetivo de precisar el tipo de cirugía efectuada, indicaciones principales, complicaciones y morbimortalidad operatoria. 22 pacientes cuyas historias estuvieron disponibles para revisión. La principal indicación de cirugía fueron neoplasias malignas 86,4% de los casos, las metástasis de carcinoma colorrectal (7) la primera indicación seguida de hepatocarcinoma (4). Otras indicaciones incluyeron: colangiocarcinomas perifericos (2), metástasis de tumores neuroendocrinos (2), diversas lesiones benignas (3) otros tumores (4). La hepatectomía derecha y segmentectomías anatómicas fueron los más frecuentes con un 27,3 % cada uno, seguidos de segmentectomía lateral izquierda (II y III) en 19%. El tiempo operatorio promedio fue 270,4 min (rango: 180-560 min). El promedio de estancia hospitalaria fue 7,7 días (rango:4-30). El 8% de nuestros pacientes no requirió estancia posoperatoria inmediata en UTI. La tasa de complicaciones fue 44,5% siendo el derrame pleural reactivo y el sangrado posoperatorio más frecuentes. La tasa de reintervención fue 18,2%. La mortalidad global fue 9% (2/22), y la inherente al procedimiento quirúrgico 4,5% (1/22). Las resecciones hepáticas mayores son un procedimiento relevante en el armamento del cirujano oncólogo dedicado al tratamiento de neoplasias digestivas, la morbimortalidad operatoria en nuestra institución es similar a otros centros de mayor volumen a nivel internacional.

Review the recent experience and results of major hepatic resections of patients treated at our institution. Retrospective review of clinical records patients submitted to major hepatic resection inten years, between August 1998 to August 2008, with descriptive statistics of type of surgery, indications, complications and surgical related morbimortality. Twenty two patients with complete clinical records for review were included. The main indication for surgery were malignant neoplasms in 86,4% of the cases,being colorectal liver metastasis (7) the first one followed by hepatocarcinomas (4). Other indications included:The periferic colanghiocarcinomas (2), metastasis from neuroendocrine tumors (2), varied beningn lesions (3)and other tumors (4). Right hepatectomy and anatomical segmentectomies were the most frequent procedures 27.3% each, followed by left lateral segmentectomy (II - III) in19% of the cases. Medium operative time was 270.4 min (range: 180-560 min). Mean hospital stay was 7.7 days (range: 4-30). 8% of the patients did not required post operative ICU care. Complications rate was 44.5% being reactive pleural effusion and postoperative bleedingthe most frecuent ones. Reintervention rate was 18.2%, global mortality 9% (2/22), and surgical related mortality was 4.5% (1/22). Major hepatic resections are a relevant procedure in the armament of surgical oncologists dedicated to treatment of digestive neoplasms, the number of such procedures done at public institutions are limited. Operative morbimortality in our institution is similar to other major volume centers.

Avaliação da morbidade e da mortalidade após ressecções hepáticas / Assessment of morbidity and mortality after hepatic resections

OBJETIVO: Descrever a, morbidade e a mortalidade em pacientes submetidos à hepatectomia. MÉTODOS: Avaliou-se o tipo de hepatectomia, necessidade de transfusão sanguínea peroperatória, permanência hospitalar, complicações e a mortalidade pós-operatórias. Para análise estatística utilizou-se o teste exato de Ficher, considerando-se significativos valores de p < 0,05. RESULTADOS: Foram realizadas 22 (31,43 por cento) hepatectomias maiores, 13 (18,57 por cento) hepatectomias direitas com uma alargada aos segmentos IVa e IVb; nove (12,86 por cento) hepatectomias esquerdas, dentre estas, seis incluíram o segmento I. Foram feitas 48 (68,57 por cento) hepatectomias menores, sendo 36 (51,43 por cento) ressecções segmentares e 12 (17,14 por cento) ressecções não anatômicas. A principal indicação para ressecção de metástases foi o adenocarcinoma colorretal em 27 (38,57 por cento) pacientes. O tumor primário de maior incidência foi o carcinoma hepatocelular em 14 (20 por cento) pacientes, seguido pelo colangiocarcinoma em seis (8,57 por cento) pacientes. Entre as 13 (18,57 por cento) ressecções para doenças benignas predominou a litíase intra-hepática (n=6). Seis pacientes (8,57 por cento) foram hemotransfundidos no peroperatório. A permanência hospitalar variou de 2 a 28 dias (média = quatro dias). Oito (11,43 por cento) pacientes desenvolveram complicações pós-operatórias. A mortalidade geral foi 8,57 por cento, concentrando-se nos pacientes com carcinoma hepatocelular (5,71 por cento). CONCLUSÃO: As metástases de adenocarcinoma colorretal foram as principais indicações cirúrgicas e as hepatectomias menores foram os procedimentos mais realizados. Apesar da baixa incidência geral de complicações pós-operatórias, evidenciou-se alta morbimortalidade em pacientes cirróticos com carcinoma hepatocelular.

OBJECTIVE: To describe morbidity and mortality in patients undergoing hepatectomy. METHODS: We evaluated hepatectomy according to type of surgery, perioperative blood transfusion, hospital stay, complications and postoperative mortality. For statistical analysis we used the Ficher's exact test, considering significant p values <0.05. RESULTS: We performed 22 (31.43 percent) major hepatectomies, 13 (18.57 percent) being right hepatectomies extended to segments IVa and IVb, nine (12.86 percent) left hepatectomies, among these, six included the segment I. We conducted 48 (68.57 percent) minor hepatectomies, 36 (51.43 percent) segmental resections and 12 (17.14 percent) non-anatomical resections. The main indication for resection was colorectal adenocarcinoma metastasis in 27 (38.57 percent) patients. The higher incidence of primary tumor was hepatocellular carcinoma in 14 (20 percent) patients, followed by cholangiocarcinoma in six (8.57 percent). Among the 13 (18.57 percent) resections for benign diseases, the predominant one was intrahepatic lithiasis (n = 6). Six patients (8.57 percent) received perioperative blood transfusion. Hospital stay ranged from 2 to 28 days (mean four days). Eight (11.43 percent) patients developed postoperative complications. Overall mortality was 8.57 percent, mostly in patients with hepatocellular carcinoma (5.71 percent). CONCLUSION: Metastatic colorectal adenocarcinoma was the main indication for surgery and minor hepatectomies were the most common procedures. Despite the low overall incidence of postoperative complications, there was high morbidity and mortality in cirrhotic patients with hepatocellular carcinoma.

É possível diminuir o sangramento em hepatectomias sem a realização de exclusão vascular total ou parcial?: Resultados do uso de radiofrequência bipolar com agulhas resfriadas / Is it possible to reduce the bleeding in hepatic resections without conducting total or partial vascular exclusion?: Results of the use of bipolar radiofrequency with cold needles

RACIONAL: Embora a ressecção seja ainda o procedimento de escolha no tratamento curativo das lesões malignas do fígado, o sangramento permanece como fator de morbidade com grande impacto na cirurgia hepática. Com o intuito de minimizar esta complicação, diversas opções tecnológicas têm sido utilizadas, entre elas mais recentemente a radiofrequência, permitindo que o procedimento seja realizado com incisões menores, sem necessidade de clampeamento vascular, com mínima dissecção hepática, ou sangramento. OBJETIVO: Apresentar os resultados em uma série de pacientes utilizando nova técnica de ressecção do parênquima hepático através de agulhas paralelas de radiofrequência bipolar desenvolvidas pelos próprios autores, verificando o impacto no sangramento trans-operatório dos pacientes submetidos à hepatectomias. MÉTODOS: Sessenta pacientes foram submetidos à ressecção hepática através do uso da radiofrequência bipolar. O sangramento per-operatório foi avaliado através da medição do volume coletado em aspirador e pela diferença de peso nas compressas utilizadas durante o procedimento. Todos os casos foram acompanhados em sua função hepatocitária através de exames laboratoriais durante a primeira semana de pós-operatório. RESULTADOS: As ressecções hepáticas foram realizadas com média de 87 minutos, tamanho médio da incisão abdominal de 14 cm e sangramento médio de 58 mililitros. Nenhum paciente recebeu transfusão de sangue ou derivados. Não foram utilizados cateteres venosos centrais. Todos pacientes obtiveram rápida recuperação anestésica, obtendo alta da sala de recuperação para a enfermaria em menos de 12 horas. A drenagem pós-operatória foi anotada até a retirada do dreno abdominal em todos os pacientes. O tempo de internação hospitalar médio foi de 3,2 dias. Após um pico de elevação das provas de função hepática nos primeiros três dias, todos apresentaram retorno destes exames aos parâmetros pré-operatórios ao final do 1o mês. CONCLUSÃO: É possível,...

BACKGROUND: Although the resection is the chosen procedure in the therapeutic treatment of liver malign lesions, the bleeding represents a factor of morbidity with a great impact in the hepatic surgery. With the means of minimizing this complication, several technological options have been utilized, being radiofrequency more recently among them, allowing the procedure to be realized with smaller incisions, without the need of vascular clamping, with minimum hepatic dissection, or bleeding. AIM: To present the results of the use of a new technique of hepatic parenchyma resection through parallel needles of bipolar radiofrequency developed by the authors themselves, verifying the impact in the trans-operation bleeding of patients subjected to hepatectomies. METHODS: Sixty patients were submitted to hepatic resection through the use of bipolar radiofrequency. The pre-operation bleeding was evaluated through the medication of the collected volume in the vacuum and by the weight difference in the compresses utilized during the procedure. All cases were monitored in their hepatocitary function through laboratory tests during the first week of the post-operation. RESULTS: The hepatic resections were realized with the mean of 87 minutes, mean incision size of 14 cm and mean bleeding of 58 ml. None of the patients received blood transfusion or derivatives. Central venous catheters were not utilized. All patients obtained fast anesthetic recuperation, leaving the recuperation room to the ward in less than 12 hours. The post-operation drainage was noted down until the drain removal occurring in all patients. The mean hospitalization time was of 3,2 days. After the elevation peak of the hepatic function tests in the first three days, all patients presented regression of them in a one month. CONCLUSION: It is possible, feasible and valid to use radiofrequency needle to perform hepatectomy, even larger ones, reducing bleeding.

Evaluation of the mortality rate caused by different periods of selective portal vein occlusion in rats

Mortality from acute selective portal vein occlusion (SPVO) is a matter of concern for surgeons during the management of traumatic portal vein injury. However, mortality rates related to different periods of SPVO remains undetermined. PURPOSE: To determine the mortality rates resulting from different periods of acute SPVO in rats. METHODS: Wistar male rats were randomized into 8 experimental, and 8 control groups. Experimental animals underwent SPVO during 15 to 75 minutes, and control groups underwent sham procedures. All surviving animals were followed up to 14 days for assessment of mortality rate. RESULTS: Death rates varied from 0 percent in the 15 min SPVO group, to 100 percent with 65 and 75 minutes of SPVO. A strongly positive correlation was observed between mortality rates and SPVO periods (p<0.001) with either linear or quadratic regression analysis tests. All deaths in the 20min and 25min SPVO groups occurred after 75 min from the moment of clamping (or after 60 min from unclamping); death from 30 or more min SPVO occurred predominantly within 75 min from clamping moment (or within 60 min from unclamping). (Exact Fisher test, p=0.009). CONCLUSIONS: The mortality from SPVO in rats increases with longer duration of SPVO; with deaths occurring later for short periods (< 25 min) of SPVO and earlier for longer periods (> 30 min) of SPVO.

A mortalidade da oclusão seletiva da veia porta (OSVP) preocupa os cirurgiões durante o tratamento de lesão traumática da veia porta. Entretanto, as taxas de mortalidade decorrentes de diferentes períodos de OSVP não estão determinadas. OBJETIVO: Determinar a mortalidade Decorrente de diferentes períodos de oclusão seletiva da veia porta (OSVP) em ratos. MÉTODOS: Ratos Wistar machos foram randomizados em 8 grupos experimentais e 8 controles. Os experimentais foram submetidos a OSVP por períodos de 15 a 75 minutos, seguidos de observação até o óbito, e os sobreviventes até 14 dias. Os grupos controles receberam idênticos procedimentos, exceto a OSVP. RESULTADOS: A mortalidade, a partir do momento da oclusão, aumentou progressivamente, de 0 por cento no grupo de 15min, atingindo 100 por cento nos grupos de 65min e 75min de OSVP. Houve alta correlação positiva entre mortalidade e duração da OSVP (p<0.001; tanto em teste de Regressão linear quanto quadrática). Os óbitos decorrentes de 20 e 25 min de OSVP ocorreram após 75min do clampeamento (ou após 60 min do desclampeamento); os decorrentes de 30min ou mais ocorreram predominantemente antes de decorridos 75 min do clampeamento (ou 60 min do desclampeamento). (Teste exato de Fisher, p<0.05). CONCLUSÕES: A mortalidade da OSVP em ratos aumenta com a maior duração da oclusão; os óbitos ocorrem mais tardiamente após oclusões breves (< 25 min), e mais precocemente nas oclusões mais prolongadas (> 30 minutos).

Avaliação de critério pós-operatório de insuficiência hepática como fator prognóstico de mortalidade após hepatectomia: importância da alteração combinada do tempo de protrombina e da bilirrubina sérica / Evaluation of postoperative criteria of liver failure as a prognostic factor of mortality after hepatectomy: importance of the combined alteration of protrombin time and serum bilirubin

INTRODUÇÃO: Não existe definição padronizada de insuficiência hepática pós-operatória (IHP) e seu impacto sobre a mortalidade após hepatectomia ainda não foi esclarecido. CASUÍSTICA E MÉTODOS: Foram estudados 775 hepatectomias eletivas consecutivas; foi analisado o impacto, sobre a mortalidade, da ocorrência de tempo de protrombina (TP) menor que 50% e bilirrubina total sérica (BT) maior que 50 mol/L (3 mg/dl) nos dias pós-operatórios (PO) 1, 3, 5 e 7. RESULTADOS: Mortalidade global foi de 3,4%, sendo maior em pacientes com um TP < 50% ou BT > 50 mol/L no pós-operatório. A conjunção de TP < 50% e BT > 50 mol/L no quinto PO foi associada à mortalidade operatória de 59% (acurácia 98%) CONCLUSÕES: A associação de TP < 50% e BT > 50 ml/L no quinto PO foi preditor acurado de mortalidade após hepatectomia, de aplicação simples.

INTRODUCTION: There are no standardised definiton of postoperative liver failure (PLF) and its impact on mortality after hepatectomy wasn't yet clarified. METHODS: It was studied 775 sequential and elective hepatectomias; it was analyzed the impact, on mortality, of a prothrombin time (PT) less than 50% and a serum bilirubin (SB) more than 50 mol/L (3 mg/dl) on postoperative days (POD) 1, 3, 5 and 7. RESULTS: Overall mortality was 3.4% and it was increased in patients with postoperative PT < 50% or SB > 50 mol/L. The conjunction of PT < 50% and SB > 50 mol/L on POD 5 was associated to a surgical mortality of 59% (accuracy 98%) CONCLUSIONS: The association of PT < 50% and SB > 50 mol/L on POD 5 was an accurate predictor of mortality after hepatectomy, easily applicable.

Trasplante hepático de donador vivo adulto-adulto / Liver transplantation of living donor adult-to-adult

End-stage liver disease Is being treated by liver transplantation since more than 20 years. Despite social and legislative efforts, the number of cadaveric organs suitable for liver transplantation has not grown to mach the surplus of patients with end-stage liver disease. Whit the growing discrepancy between donors and recipients, the median waiting time for liver transplantation has increases dramatically. As a result, the number of patients who die while waiting is increasing. To attempt to meet the growing needs of recipients, surgeons are developing innovative techniques to increase the number of donated livers. These include: split liver transplantation and transplantation of a part of the liver from living donors. This review will focus on adult-to-adult transplantation of the right lobe from a living donor.

El trasplante hepático ha sido una terapéutica aceptada por más de 20 años. A pesar de los esfuerzos sociales y legislativos, el número de órganos cadavéricos disponibles no se ha incrementado en la misma proporción que los pacientes con enfermedad hepática terminal. El tiempo y la mortalidad en la lista de espera se han incrementado dramáticamente. Para tratar de compensar esta disparidad, se han desarrollado nuevas técnicas para incrementar el número de órganos, como son: la división de un hígado en dos injertos o utilizar un lóbulo o segmentos del hígado de un donador vivo. Esta revisión se enfocará en el trasplante hepático del lóbulo derecho de donador vivo adulto-adulto.

Liver resection: 10-year experience from a single Institution

RACIONAL: A ressecção hepática constitui o principal tratamento da maioria das neoplasias primárias do fígado e de casos selecionados de tumores metastáticos. Entretanto, este procedimento está associado a taxas expressivas de morbidade e mortalidade. OBJETIVO: Analisar a experiência com hepatectomia em um período de 10 anos para determinar os fatores de risco, a morbidade e a mortalidade das ressecções hepáticas. PACIENTES E MÉTODOS: Revisão retrospectiva dos prontuários médicos dos pacientes que foram submetidos a hepatectomia no período de janeiro de 1994 a março de 2003. RESULTADOS: Foi realizada hepatectomia em 83 pacientes (41 mulheres e 42 homens) durante o período do estudo. A idade média dos pacientes foi de 52,7 anos, com variação de 13 a 82 anos. As principais indicações de ressecção hepática foram carcinoma do intestino grosso metastático (36 pacientes) e carcinoma hepatocelular (19 pacientes). Hepatectomias ampliadas e maiores foram realizadas em 20,4% e 40,9% dos pacientes, respectivamente. Transfusão sangüínea foi necessária em 38,5% das operações. A morbidade total foi 44,5%. Complicações com risco de vida ocorreram em 22,8% dos casos e as mais comuns foram pneumonia, insuficiência hepática, coleção intra-abdominal e sangramento intra-abdominal. Entre as complicações menores (30%), as mais comuns foram extravasamento biliar e derrame pleural. O tamanho do tumor e transfusão sangüínea foram associadas com complicações maiores (P = 0,0185 e P = 0,0141, respectivamente). A mortalidade operatória foi de 8,4% e os fatores de risco relacionados com a mortalidade foram idade avançada e realização de exclusão vascular (P = 0,0395 e P = 0,0404, respectivamente). O período de internação médio foi de 6,7 dias. CONCLUSÃO: As hepatectomias podem ser realizadas com baixa mortalidade e aceitável morbidade. Transfusão sangüínea pode ser reduzida com o emprego de técnica meticulosa e quando indicada, a exclusão vascular.

Factors affecting the outcome after hepatic resection

This study included 24 cases of major hepatic resection which were performed for various indication. The study examined the influence of predictor variables upon morbidity and mortality after hepatic resection. These factors included age, sex, preoperative risk factors as diabetes mellitus and cardiovascular disease, serum total bilirubin, plasma retention rate of indocyanine green [ICG] at 15 minutes in patients with chronic liver disease, operative blood loss, operation time and vascular occlusion time. After hepatic resection, the mortality rate was 16.6% and the morbidity rate was 45.8%. The study also revealed the following criteria; affected postoperative morbidity and mortality, serum total bilirubin, ICG 15 value, operative blood loss and presence or absence of chronic liver disease

Estudio de los resultados de 155 resecciones hepáticas / Analysis of the results of 155 hepatic resections

Se analizan 155 pacientes sometidos a resecciones hepáticas entre 1972 y 1991. Se consideran elementos diagnósticos de las diferentes etiologías, las indicaciones quirúrgicas, los resultados en cuanto a complicaciones y mortalidad. Se consideran los diferentes cambios de criterio en cuanto a la resecabilidad y a las causas de mortalidad, destacando la insuficiencia hepática como causa de las mismas. Asimismo, la necesidad de preservar masa hepática siempre y cuando se conserven los criterios oncológicos

Diez años de experiencia en resecciones hepáticas / Our experience in liver resections during 10 years

En 10 años se efectuaron 106 resecciones hepáticas en 99 pacientes, en 5 se realizaron dos y en 1 tres. Veintinueve fueron por patología benigna, 4 por traumatismo y 73 por patología maligna (33 por neoplasia primaria y 40 por metástasis). Las complicaciones intra-operatorias fueron 1 paro cardíaco y 3 lesiones venosas leves sin mortalidad (3,8//). Complicaciones post-operatoria ocurrieron en 29 pacientes (27,5//). No hubo mortalidad por patología benigna. La mortalidad global fue de 10,3// (11/106). En la cirugía electiva, la mortalidad fue del 1,6// (1/61) en las resecciones hepáticas puras y del 15,4//(6/39) cuando se asoció a otra cirugía mayor oncológica, mientras que en las resecciones de urgencia fue del 66,7// (4/6). La supervivencia media de los resecados con criterio curativo por hepatocarcinomas y por metástasis de cáncer colorrectal, fue de 46 y 38,5 meses respectivamente. Se concluye que las resecciones hepáticas electivas, no asociadas a otra cirugía mayor tuvieron en nuestra experiencia baja mobimortalidad y proporcionaron supervivencias importantes y de buena calidad

Resecciones hepáticas, aspectos quirúrgicos, morbilidad y mortalidad / Hepatic resections, surgical aspects, morbidity and mortality

Se presenta la experiencia institucional en resecciones hepáticas electivas durante los años 1990 y 1991. De 215 resecciones hepáticas, 87% correspondieron a lesiones malignas y un 13% a lesiones benignas. El tamaño promedio de las lesiones fue de 7,8 cm. En 11 pacientes se constató invasión vascular tumoral. En forma rutinaria se utilizó un disector ultrasónico (Cavitron), y control vascular unilateral previo a la transección del parénquima. El promedio de sanfre trasfundida fue de 2,3 unidades por paciente y se demostró una correlación entre cantidad de sangre trasfundida y cantidad de tejido hepático resecado. Factores determinantes de morbilidad fueron la edad del paciente, malignidad de la lesión, trasfusión de más de 3 uds. de sangre, y extensión de la resección. La mortalidad fue de 2,3% (5 pacientes) y afectó sólo a pacientes con lesiones malignas. No hubo mortalidad operatoria

Resecciones hepáticas: experiencia de un Centro Universitario / Hepatic resections: experience in a university center

La cirugía resectiva hepática ha sido posible desarrollarla a partir del moderno conocimiento de la anatomía quirúrgica de este órgano. Se analizaron en forma retrospectiva 54 pacientes atendidos entre enero de 1980 y julio de 1988, 29 varones, 53,7% y 25 mujeres, 46,3% con una edad promedio de 38,5 años, DS 16,5 y rango de 7 a 78 años. Cuarenta y un pacientes (75,9%) fueron sometidos a cirugía electiva y 13 (24,1%), de urgencia. Se practicó segmentectomía en 8 pacientes (14,8%), lobectomía reglada a 10 (18,5%) y resecciones atípicas en 36(66,7%). La mortalidad global de la presente serie fue de un 14,8% con una cifra de 12,2% en cirugía electiva y un 23,1% en cirugía de urgencia. El empleo de ultrasonografía, TAC y angiografía selectiva permitirán seleccionar adecuadamente los casos susceptibles de resecar