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1.
J Surg Oncol ; 118(4): 704-708, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-30079542

RESUMO

The management of tumors involving or infiltrating the inferior vena cava (IVC) constitutes a great surgical challenge, since radical resection affords patients the only possibility for long-term survival. These tumors can be resected without graft interposition, provided that there is adequate collateral circulation and that the renal function can be secured. Meanwhile, ligation of the left renal vein may be possible due to the existence of collateral circulation through the adrenal and gonadal veins. We briefly present our experience on renal outflow preservation through implantation of the right renal vein into the IVC stump or through diversion of the left renal vein into the inferior mesenteric vein.


Assuntos
Abdome/cirurgia , Rim/fisiologia , Leiomiossarcoma/cirurgia , Neoplasias Vasculares/cirurgia , Veia Cava Inferior/cirurgia , Abdome/patologia , Adulto , Feminino , Seguimentos , Humanos , Testes de Função Renal , Leiomiossarcoma/patologia , Masculino , Pessoa de Meia-Idade , Circulação Renal , Resultado do Tratamento , Neoplasias Vasculares/patologia , Procedimentos Cirúrgicos Vasculares , Veia Cava Inferior/patologia , Adulto Jovem
2.
World J Surg ; 41(7): 1871-1881, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-28251269

RESUMO

Solid pseudopapillary neoplasms of the pancreas are rare tumors accounting for 1-2% of pancreatic exocrine neoplasms. This entity was first described by Dr. Frantz in 1959 and was defined by the World Health Organization in 1996 as "solid pseudopapillary tumor." It is most often a benign neoplasm, but 10-15% of the cases are malignant. Over the past decades, the incidence of this tumor is increasing. However, many surgeons are still unfamiliar with this neoplasm and its unique characteristics, which can lead to pitfalls in the diagnosis and treatment. The correct diagnosis of SPNP is of utmost importance since it has a low malignant potential and with the appropriate treatment, patients have a long life expectancy. There are many genetic alterations, involving various signaling pathways that have been associated with SPNP and are very important in diagnosing the tumor. The cornerstone of SPNP treatment includes surgical excision of the tumor, preserving as much pancreatic tissue as possible. We review the information in the literature regarding more organ-preserving techniques and possible clinical features that might indicate a malignant potential, thus demanding a more radical intraoperative excision.


Assuntos
Carcinoma Papilar/cirurgia , Neoplasias Pancreáticas/cirurgia , Caderinas/fisiologia , Carcinoma Papilar/genética , Carcinoma Papilar/patologia , Feminino , Proteínas Hedgehog/fisiologia , Humanos , Masculino , Neoplasias Pancreáticas/genética , Neoplasias Pancreáticas/patologia , Via de Sinalização Wnt/fisiologia , beta Catenina/fisiologia
4.
World J Surg ; 40(7): 1695-701, 2016 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-26913735

RESUMO

BACKGROUND: Intraoperative use of specialized equipment and disposables contributes to the increasing cost of modern liver surgery. As a response to the recent severe financial crisis in our country we have employed a highly standardized protocol of liver resection that minimizes intraoperative and postoperative costs. Our goal is to evaluate cost-effectiveness of this protocol. STUDY DESIGN: We evaluated retrospectively all patients who underwent open hepatic resections for 4 years. All resections were performed by the same surgical team under selective hepatic vascular exclusion, i.e., occlusion of the hepatoduodenal ligament and the major hepatic veins, occasionally combined with extrahepatic ligation of the ipsilateral portal vein. Sharp parenchymal transection was performed with a scalpel and hemostasis was achieved with sutures without the use of energy devices. In each case we performed a detailed analysis of costs and surgical outcomes. RESULTS: Our cohort included 146 patients (median age 63 years). 113 patients were operated for primary or metastatic malignancies and 33 for benign lesions. Operating time was 121 ± 21 min (mean ± SD), estimated blood loss was 310 ± 159 ml (mean ± SD), and hospital stay was 7 ± 5 days (mean ± SD). Six patients required admission in the ICU postoperatively. 90-day mortality was 2.74 %, and 8.9 % of patients developed grade III/IV postoperative complications (Clavien-Dindo classification). Total in-hospital cost excluding physician fees was 6987.63 ± 3838.51 USD (mean ± SD). CONCLUSIONS: Our analysis suggests that, under pressing economic conditions, the proposed surgical protocol can significantly lessen the financial burden of liver surgery without compromising patient outcomes.


Assuntos
Hepatectomia/economia , Veias Hepáticas/cirurgia , Tempo de Internação/economia , Neoplasias Hepáticas/cirurgia , Veia Porta/cirurgia , Complicações Pós-Operatórias/economia , Instrumentos Cirúrgicos/economia , Suturas/economia , Idoso , Perda Sanguínea Cirúrgica , Análise Custo-Benefício , Recessão Econômica , Feminino , Hepatectomia/métodos , Custos Hospitalares , Humanos , Ligadura , Hepatopatias/cirurgia , Neoplasias Hepáticas/secundário , Masculino , Pessoa de Meia-Idade , Duração da Cirurgia , Estudos Retrospectivos , Estados Unidos
5.
Artif Organs ; 40(8): 755-64, 2016 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-27094211

RESUMO

Artificial liver support gained considerable interest in recent years due to the development of various albumin dialysis systems, which prolong survival of some patients with acute liver failure (ALF). Τhis study aims to examine the role of peritoneal albumin dialysis in a postoperative ALF model. ALF was induced in 14 female Landrace pigs by a combination of major liver resection (70-75% of total parenchyma) and ischemic-reperfusion injury on the liver remnant. Animals were randomly divided in two groups (n = 7 each). Both were monitored for 12 h of reperfusion and received peritoneal dialysis for 6 h, beginning 6 h after reperfusion. The albumin group received an albumin-rich solution and the control group received albumin-free solution. The control group gradually developed intracranial hypertension, whereas, in the albumin group, rise in the intracranial pressure was substantially attenuated (P < 0.01, t = 12 h). Albumin-treated animals had significantly lower levels of ammonia (P < 0.01), total bile acids (P < 0.01), free fatty acids (P < 0.05), lactate (P < 0.01), and total bilirubin (P < 0.05). Liver malondialdehyde and protein carbonyl were significantly reduced (P = 0.007 and P = 0.001 at t = 12 h) after albumin dialysis. Results suggest that this method may become a useful adjunct in the management of ALF, thus, justifying further study.


Assuntos
Falência Hepática Aguda/terapia , Diálise Peritoneal/métodos , Albumina Sérica/uso terapêutico , Animais , Feminino , Hemodinâmica , Pressão Intracraniana , Fígado/fisiopatologia , Falência Hepática Aguda/sangue , Falência Hepática Aguda/fisiopatologia , Estresse Oxidativo , Traumatismo por Reperfusão/sangue , Traumatismo por Reperfusão/fisiopatologia , Traumatismo por Reperfusão/terapia , Suínos
6.
World J Surg ; 38(11): 2967-72, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24952079

RESUMO

BACKGROUND: Recent studies have indicated that preoperative biliary drainage (PBD) should not be routinely performed in patients suffering from obstructive jaundice before surgery. The severity of jaundice that mandates PBD has yet to be defined. Our aim was to investigate whether PBD is truly justified in severely jaundiced patients before pancreaticoduodenectomy. The parameters evaluated were overall morbidity, length of hospital stay, and total in-hospital mortality. METHODS: From January 2000 to December 2012, a total of 240 patients underwent pancreaticoduodenectomy for periampullary tumors. Group A comprised 76 patients with preoperative serum bilirubin ≥15 mg/dl who did not undergo PBD before surgery. Group B comprised another 76 patients, matched for age and tumor localization (papillary vs. pancreatic head) who underwent PBD 2-4 weeks before pancreaticoduodenectomy and were identified from the same database. RESULTS: Less operative time was required in the 'no PBD' group compared with the 'PBD' group (210 vs. 240 min). Total intraoperative blood loss and blood transfusions were also significantly less in the 'no PBD' group. There was no difference detected in the rate of pancreatic fistula or biliary fistula formation. Group A patients demonstrated significantly lower morbidity than group B (24 vs. 36 %, respectively) and therefore required briefer hospitalization (11 vs. 16 days). Mild infectious complications appear to be the main factor that enhanced morbidity in the PBD group. However, total in-hospital mortality was not significantly different between the two groups. CONCLUSIONS: Even severe jaundice should not be considered as an indication for PBD before pancreaticoduodenectomy, as PBD increases infections and postoperative morbidity, therefore delaying definite treatment.


Assuntos
Neoplasias do Ducto Colédoco/cirurgia , Drenagem/efeitos adversos , Neoplasias Duodenais/cirurgia , Mortalidade Hospitalar , Tempo de Internação , Neoplasias Pancreáticas/cirurgia , Pancreaticoduodenectomia/efeitos adversos , Cuidados Pré-Operatórios/efeitos adversos , Idoso , Perda Sanguínea Cirúrgica , Transfusão de Sangue , Estudos de Casos e Controles , Feminino , Humanos , Infecções Intra-Abdominais/etiologia , Icterícia Obstrutiva/cirurgia , Masculino , Pessoa de Meia-Idade , Duração da Cirurgia
7.
World J Surg ; 37(9): 2197-201, 2013 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-23661260

RESUMO

BACKGROUND: Treatment of peripherally located liver tumors with diaphragmatic invasion is technically demanding but does not preclude resection for cure. The aim of the present study was to compare patients undergoing combined liver and diaphragmatic resection with those submitted to hepatectomy alone so as to evaluate the safety, effectiveness, and value of this complex surgical procedure. METHODS: From January 2000 to September 2011, 36 consecutive patients underwent en bloc liver-diaphragm resection (group A). These were individually matched for age, gender, tumor size, pathology, and co-morbitidies with 36 patients who underwent hepatectomy alone during the same time (group B). Operative time, warm ischemia time, blood loss, required transfusions, postoperative complications, and long-term survival were evaluated. RESULTS: Mean operative time was significantly longer in group A than in group B (165 vs 142 min; P = 0.004). The two groups were comparable regarding warm ischemia time, intraoperative blood loss, required transfusions, and postoperative laboratory value fluctuations. Some 33 % of group A patients developed complications postoperatively as opposed to 23 % of group B patients (P = 0.03). The mortality rate was 2.8 % in group A compared to 0 % in group B. Postoperative follow-up demonstrated 60 % 1-year survival for group A patients as opposed to 80 % 1-year survival for group B patients, a difference that is practically eliminated the longer the follow-up period is extended (35 vs 40 % 3-year survival and 33 vs 37 % 5-year survival for group A and group B patients, respectively). CONCLUSIONS: En bloc diaphragmatic and liver resection is a challenging but safe surgical procedure that is fully justified when diaphragmatic infiltration cannot be ruled out and the patient is considered fit enough to undergo surgery.


Assuntos
Diafragma/patologia , Diafragma/cirurgia , Hepatectomia/métodos , Neoplasias Hepáticas/patologia , Neoplasias Hepáticas/cirurgia , Neoplasias Musculares/cirurgia , Adulto , Idoso , Contraindicações , Feminino , Humanos , Tempo de Internação , Neoplasias Hepáticas/mortalidade , Masculino , Pessoa de Meia-Idade , Neoplasias Musculares/patologia , Invasividade Neoplásica , Duração da Cirurgia , Complicações Pós-Operatórias/epidemiologia , Técnicas de Sutura
8.
Cureus ; 15(7): e42394, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37621783

RESUMO

BACKGROUND: Renal cell carcinoma (RCC) is the most common primary kidney cancer. In up to 4-10% of patients, the tumor is complicated with a malignant thrombus extending to the inferior vena cava (IVC). Complete surgical excision of the RCC and the neoplastic thrombus can be curative. We aim to present a safe and feasible alternative transabdominal operative technique with the omission of thoracotomy, as applied in six patients diagnosed with RCC and IVC thrombus extending over the diaphragm. METHODS: This case series study was conducted in a tertiary university hospital in Athens, Greece. All six patients, who were operated on for RCC and a malignant thrombus exceeding in the intrapericardial IVC in our department from January 2009 until March 2020, were screened. Intraoperatively, the infrarenal and intrapericardial IVC were clamped simultaneously with the renal and liver blood inflow. Access to the intrapericardial IVC was obtained via the central tendon of the diaphragm. Intrathoracic extension of the tumor was confirmed by transesophageal or intraoperative ultrasonography. The intrathoracic IVC was exposed to direct vision and two finger palpation was applied to secure the clamping of the IVC above the tip of the thrombus. The tumor was resected through a longitudinal venotomy and the operation was completed on a standard radical nephrectomy. RESULTS: During the study period six patients presented with RCC and intrapericardial IVC thrombus. All patients, five female and one male, underwent radical nephrectomy combined with IVC thrombectomy, without the need for a thoracotomy. The mean age was 66 years old and the mean operative time was 122.5 minutes. Mean blood loss was 338 ml and only four of the patients were transfused with two units of RBC. Operative and hospital mortality was 0%. The hospital stay was seven (six to nine) days. Only one patient required readmission and reoperation 30 days later, due to intrapericardial herniation. CONCLUSIONS: The proposed surgical technique may be curative in patients with advanced intracaval thrombus and helps reduce the associated morbidity, mortality, and the overall cost of more extended operations.

9.
World J Surg ; 36(12): 2895-900, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-22956015

RESUMO

BACKGROUND: There is evidence that small-for-size liver grafts are more vulnerable to ischemia/reperfusion injury after liver transplantation. We hypothesized that ischemic injury is more pronounced in small liver remnants after major hepatectomies. METHODS: Fifteen patients underwent extended hepatectomy with remnant liver mass less than 30% of standard liver weight (study group). These patients were matched with patients who underwent minor liver resection, with liver remnants equal to or more than 70% of standard liver weight (control group). Ischemia/reperfusion injury was assessed by tissue caspase-3 activity postoperatively as well as peak aspartate aminotransferase (AST) values and a-glutathione S-transferase (α-GST) levels adjusted for remnant liver weight. In addition, caspase-3 activity and adjusted serum markers of hepatocyte injury were correlated with the degree of postoperative portal hypertension. RESULTS: Caspase-3 activity was higher in patients with small liver remnants (22.66±6.57 vs. 12.60±4.06 count per high-power field, p<0.001). Serum markers of hepatocyte injury, when adjusted per gram of liver remnant, were found to be higher in the study group than in the control group (AST: 1.26±0.25 vs. 0.54±0.11 IU g(-1), p<0.001; α-GST: 0.14±0.02 vs. 0.08±0.01 IU g(-1), p<0.001). Tissue caspase-3 expression in the small liver remnant group correlated with both AST and α-GST levels adjusted per gram of liver remnant (r2=0.51, p=0.005 and r2=0.71, p<0.001, respectively). Significant correlations between postoperative portal hypertension and the same markers as well as caspase-3 activity were also demonstrated. CONCLUSION: Liver remnants less than 30% of standard liver weight are much more susceptible to ischemia/reperfusion injury than controls twice the size. Adjustment of serum markers of hepatocyte injury to the liver remnant weight depicts injury more accurately.


Assuntos
Hepatectomia , Fígado/anatomia & histologia , Traumatismo por Reperfusão/etiologia , Idoso , Aspartato Aminotransferases/sangue , Biomarcadores/metabolismo , Estudos de Casos e Controles , Caspase 3/metabolismo , Feminino , Glutationa Transferase/sangue , Humanos , Hipertensão Portal/enzimologia , Hipertensão Portal/etiologia , Isoenzimas/sangue , Fígado/enzimologia , Fígado/cirurgia , Masculino , Pessoa de Meia-Idade , Tamanho do Órgão , Complicações Pós-Operatórias/enzimologia , Traumatismo por Reperfusão/diagnóstico , Traumatismo por Reperfusão/enzimologia
10.
Artif Organs ; 36(4): 400-8, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22187937

RESUMO

We have previously shown that deferoxamine (DFO) infusion protected myocardium against reperfusion injury in patients undergoing open heart surgery, and reduced brain edema, intracranial pressure, and lung injury in pigs with acute hepatic ischemia (AHI). The purpose of this research was to study if DFO could attenuate sepsis inflammatory response syndrome (SIRS) and confer renoprotection in the same model of AHI in anesthetized pigs. Fourteen animals were randomly allocated to two groups. In the Group DFO (n=7), 150mg/kg of DFO dissolved in normal saline was continuously infused in animals undergoing hepatic devascularization and portacaval anastomosis. The control group (Group C, n=7) underwent the same surgical procedure and received the same volume of normal saline infusion. Animals were euthanized after 24h. Hematological, biochemical parameters, malondialdehyde (MDA), and cytokines (interleukin [IL]-1ß, IL-6, IL-8, IL-10, and tumor necrosis factor-α) were determined from sera obtained at baseline, at 12h, and after euthanasia. Hematoxylin-eosin and terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end labeling were used to evaluate necrosis and apoptosis, respectively, in kidney sections obtained after euthanasia. A rapid and substantial elevation (more than 100-fold) of serum IL-6 levels was observed in Group C reaching peak at the end of the experiment, associated with increased production of oxygen free radicals and lipid peroxidation (MDA 3.2±0.1nmol/mL at baseline and 5.5±0.9nmol/mL at the end of the experiment, P<0.05) and various manifestations of SIRS and multiple organ dysfunction (MOD), including elevation of high-sensitivity C-reactive protein, severe hypotension, leukocytosis, thrombocytopenia, hypoproteinemia, and increased serum levels of lactate dehydrogenase (fourfold), alkaline phosphatase (fourfold), alanine aminotransferase (14-fold), and ammonia (sevenfold). In sharp contrast, IL-6 production and lipid peroxidation were completely blocked in DFO-treated animals offering remarkable resistance to the development of SIRS and MOD. Profound proteinuria, strips of extensive necrosis of tubular epithelial cells, and occasional apoptotic tubular epithelial cells were already present in Group C, but not in Group DFO animals at the time of euthanasia. DFO infusion attenuated lipid peroxidation, blocked IL-6 production, and substantially diminished SIRS and MOD, including tubulointerstitial damage in pigs after acute ischemic hepatic failure. This finding shows that iron, IL-6, and lipid peroxidation are important participants in the pathophysiology of renal injury in the course of generalized inflammation and provides novel pathways of therapeutic interventions for renal protection.


Assuntos
Desferroxamina/uso terapêutico , Interleucina-6/imunologia , Isquemia/tratamento farmacológico , Rim/efeitos dos fármacos , Peroxidação de Lipídeos/efeitos dos fármacos , Hepatopatias/tratamento farmacológico , Síndrome de Resposta Inflamatória Sistêmica/tratamento farmacológico , Doença Aguda , Injúria Renal Aguda/prevenção & controle , Animais , Apoptose/efeitos dos fármacos , Feminino , Isquemia/imunologia , Rim/imunologia , Rim/patologia , Fígado/efeitos dos fármacos , Fígado/imunologia , Hepatopatias/imunologia , Distribuição Aleatória , Suínos , Síndrome de Resposta Inflamatória Sistêmica/imunologia
11.
Langenbecks Arch Surg ; 397(8): 1283-8, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23011293

RESUMO

PURPOSE: Central hepatectomy is a complex, parenchymal-sparing procedure which has been associated with increased blood loss, prolonged operating time, and increased duration of remnant hypoxia. In this report, we compare two different techniques of vascular control, namely sequential hemihepatic vascular control (SHHVC) and selective hepatic vascular exclusion (SHVE) in central hepatectomies. METHODS: From January 2000 to September 2011, 36 consecutive patients underwent a central hepatectomy. SVHE was applied in 16 consecutive patients, and SHHVC was applied in 20 patients. Both groups were comparable regarding their demographics. RESULTS: Total operative time and morbidity rates were similar in both groups. Warm ischemia time was significantly longer in SVHE patients (46 min vs 28 min, p = 0.03). Total blood loss and number of transfusions per patient were also higher in the SVHE group (650 vs. 400 mL, p = 0.04 and 2.2 vs. 1.2 units, p = 0.04, respectively). AST values were significantly higher in SVHE on days 1 and 3 compared to SHHVC patients (650 vs. 400, p = 0.04 and 550 vs. 250, p = 0.001, respectively). CONCLUSION: Sequential hemihepatic vascular control is a safe technique for central hepatectomies. Decreased intraoperative blood loss and transfusions and attenuated liver injury are the main advantages of this approach.


Assuntos
Perda Sanguínea Cirúrgica/prevenção & controle , Hepatectomia/métodos , Neoplasias Hepáticas/cirurgia , Fígado/irrigação sanguínea , Procedimentos Cirúrgicos Vasculares , Adulto , Idoso , Constrição , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias
12.
Surg Today ; 42(4): 368-75, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22075662

RESUMO

PURPOSE: The aim of this study was to investigate the pathophysiology of pancreatitis after major hepatectomy. METHODS: The study used ten female pigs. Three served as sham animals (sham group) and were killed after laparotomy to obtain normal tissue samples. Seven animals were subjected to major hepatectomy (70-75%), using the Pringle maneuver for 150 min, after constructing a portacaval side-to-side anastomosis (hepatectomy group). Duration of reperfusion was 24 h. RESULTS: Pancreatic tissue sampled 24 h after reperfusion had increased necrosis and edema in comparison to sham group and to tissue sampled at 12 h. Tissue malondialdehyde (MDA) did not differ significantly between samples at 12 and 24 h but was increased in the hepatectomy group in comparison to sham animals. Percentage increase in portal MDA content during reperfusion was greater at 12 h of reperfusion in comparison to the increase after 24 h. Portal pressure increased significantly after 12 h of reperfusion. Serum amylase and C-peptide increased during reperfusion in comparison to baseline levels. CONCLUSIONS: The findings suggest that intraoperative portal congestion is not the only cause of the development of pancreatitis after major hepatectomy. The oxidative markers suggest that reactive oxygen species produced during vascular control may be responsible as well.


Assuntos
Hepatectomia/efeitos adversos , Pâncreas/lesões , Pancreatite/etiologia , Análise de Variância , Animais , Biomarcadores , Modelos Animais de Doenças , Feminino , Hepatectomia/métodos , Inflamação/sangue , Laparotomia , Malondialdeído/sangue , Estresse Oxidativo , Pancreatite/patologia , Espécies Reativas de Oxigênio , Suínos
13.
J Pers Med ; 12(10)2022 Oct 10.
Artigo em Inglês | MEDLINE | ID: mdl-36294827

RESUMO

It has been reported that the prevention of acute portal overpressure in small-for-size liver grafts leads to better postoperative outcomes. Accordingly, we aimed to investigate the feasibility of the technique of splenic artery ligation in a case series of thirteen patients subjected to major liver resections with evidence of small-for-size syndrome and whether the maneuver results in the reduction of portal venous pressure and flow. The technique was successful in ten patients, with splenic artery ligation alleviating portal hypertension significantly. Three patients required the performance of a portocaval shunt for the attenuation of portal hypertension. Portal inflow modulation via splenic artery ligation is a technically simple technique that can prove useful in the context of major hepatectomies as well as in liver transplantations and the early evaluation and modification of portal venous pressure post hepatectomy can be used as a practical tool to guide the effect of the intervention.

14.
J Surg Res ; 168(2): 301-5, 2011 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-20036383

RESUMO

BACKGROUND: Ischemia-reperfusion (I/R) injury is one of the main factors affecting the function and structure of small bowel transplantation (SBT), by generation of proinflammatory mediators such as reactive oxygen species, reactive nitrogen species, cytokines, and endotoxin. Experimental data have demonstrated that N-acetylcysteine (NAC) attenuates intestinal I/R injury. The objective of this study was to determine the effect of NAC preconditioning on the SBT-I/R induced inflammatory cascade, with particular focus on TNF, IL-8, hyaluronic acid, and NO. METHODS: Fifteen domestic pigs were used as donors. Fifteen recipient animals were randomly assigned into two groups. Group 1: SBTx (n=7) served as controls and Group 2: SBTx (n=8) served as the experimental group (NAC administration). RESULTS: NAC administration at a continuous 4 h intravenous bolus dose of 200 mg/kg of body weight, starting before initiation of bowel transplantation, resulted in statistically significant (P<0.05) higher plasma levels of NO, and lower plasma levels of hyaluronic acid, TNF-α, IL-8, and LDH compared with those of the control group, at the 360 min time point. CONCLUSIONS: NAC confers a protective role in small bowel transplantation associated, partly, with NO generation and hyaluronic acid, TNF-α and IL-8 amelioration.


Assuntos
Acetilcisteína/administração & dosagem , Sequestradores de Radicais Livres/administração & dosagem , Intestino Delgado/irrigação sanguínea , Precondicionamento Isquêmico , Traumatismo por Reperfusão/prevenção & controle , Animais , Ácido Hialurônico/sangue , Interleucina-8/sangue , Intestino Delgado/transplante , Óxido Nítrico/sangue , Distribuição Aleatória , Traumatismo por Reperfusão/sangue , Suínos , Fator de Necrose Tumoral alfa/sangue
15.
J Surg Res ; 170(2): e233-42, 2011 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-21816413

RESUMO

BACKGROUND: The aim of this study was to develop a porcine model of post-operative liver failure (POLF) that could accurately reproduce all the neurological and metabolic parameters of the corresponding clinical syndrome that may develop after extensive liver resections. METHODS: In our model, we induced POLF by combining extended left hepatectomy and ischemia of the small liver remnant of 150 min duration. Subsequently, the remnant liver parenchyma was reperfused and the animals were closely monitored for 24 h. MATERIALS: Twelve Landrace pigs (weight 25-30 kg) were randomly assigned in two groups; eight of them constituted the experimental group, in which POLF was induced (POLF group, n = 8), whereas the rest of them (n = 4) were included in the control group (sham laparotomy without establishment of POLF). RESULTS (MEANS ± SD): All POLF animals gradually developed neurological and biochemical signs of liver failure including, among many other parameters, elevated intracranial pressure (24.00 ± 4.69 versus 10.17 ± 0.75, P = 0.004) and ammonia levels (633.00 ± 252.21 versus 51.50 ± 9.49, P = 0.004) compared with controls. Histopathologic evaluation of the liver at the end of the experiment demonstrated diffuse coagulative necrosis and severe architectural distortion of the hepatic parenchyma in all POLF animals. CONCLUSION: Our surgical technique creates a reproducible porcine model of POLF which can be used to study the pathophysiology and possible therapeutic interventions in this serious complication of extensive hepatectomies.


Assuntos
Modelos Animais de Doenças , Hepatectomia/efeitos adversos , Falência Hepática Aguda/patologia , Complicações Pós-Operatórias/patologia , Sus scrofa , Amônia/sangue , Animais , Biomarcadores/sangue , Pressão Sanguínea/fisiologia , Peso Corporal , Feminino , Hepatectomia/métodos , Pressão Intracraniana/fisiologia , Fígado/patologia , Fígado/cirurgia , Falência Hepática Aguda/etiologia , Falência Hepática Aguda/fisiopatologia , Necrose , Derivação Portocava Cirúrgica/efeitos adversos , Derivação Portocava Cirúrgica/métodos , Complicações Pós-Operatórias/fisiopatologia , Traumatismo por Reperfusão/patologia , Traumatismo por Reperfusão/fisiopatologia
16.
Artif Organs ; 35(1): 29-36, 2011 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-20618230

RESUMO

Postoperative liver failure remains a major cause of morbidity and mortality after extensive hepatectomies. This study aims to evaluate the effectiveness of a hepatocyte bioreactor in the treatment of experimental post-hepatectomy liver failure. Our experimental model included a combination of a side-to-side portacaval shunt, occlusion of the hepatoduodenal ligament for 150 min, 70% hepatectomy, and reperfusion. Following the development of liver failure, 12 pigs were randomized into a control group (n = 6) and a treatment group (n = 6). Both groups underwent extracorporeal perfusion through a plasma separation device, a membrane oxygenator, and two parallel bioreactors. In the latter group, the bioreactors were loaded with 10 billion fresh hepatocytes, isolated from a donor pig. Following hepatocyte treatment, all animals were maintained for 24 h under mechanical ventilation, with intravenous fluid and glucose supplementation. Hemodynamic parameters, intracranial pressure, and biochemical parameters were measured. Liver biopsies were obtained during the 24-h autopsy. The extracorporeal circuit was well-tolerated hemodynamically. Treated animals had lower intracranial pressure compared with controls (at 24 h, 15 ± 3.1 vs. 22 ± 3.5 mm Hg, P = 0.006). Plasma ammonia in treated animals was lower compared with controls at 12 h (100 ± 29 vs. 244 ± 131 µmol, P = 0.026). Liver histological study showed decreased necrosis and increased regeneration activity in treated animals compared with controls. Treatment through an extracorporeal hepatocyte bioreactor attenuates brain edema and improves histological and functional parameters of the liver remnant of pigs with posthepatectomy liver failure.


Assuntos
Hepatócitos/citologia , Falência Hepática/terapia , Fígado Artificial , Animais , Reatores Biológicos , Desenho de Equipamento , Hepatectomia , Fígado/citologia , Fígado/patologia , Fígado/cirurgia , Falência Hepática/patologia , Testes de Função Hepática , Suínos
17.
World J Surg Oncol ; 9: 149, 2011 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-22085420

RESUMO

Permanent or temporary hypoparathyroidism may be a debilitating result of radical cervical surgery, as noted most commonly following thyroid or parathyroid surgery. However, it can also be the outcome of any surgical procedure involving bilateral extensive manipulation of the anterior neck triangle, especially in order to ensure oncologically adequate surgical margins. We report our experience of three patients that underwent parathyroid immediate autotransplanation following extensive surgical manipulations of the neck region for oncological reasons. PTH levels were restored to normal by the fourth postoperative week, allowing us to wean the patients off calcium and vitamin D3 supplementation, which was attributed to full autograft function. Parathyroid autotransplantation, immediate or delayed, is a simple and safe technique which should be considered by the surgeon whenever there is a high risk for postoperative hypoparathyroidism following radical operations of the neck for oncological reasons.


Assuntos
Neoplasias Esofágicas/cirurgia , Hipoparatireoidismo/terapia , Glândulas Paratireoides/transplante , Idoso , Neoplasias Esofágicas/complicações , Feminino , Humanos , Hipoparatireoidismo/etiologia , Masculino , Pessoa de Meia-Idade , Hormônio Paratireóideo/sangue , Complicações Pós-Operatórias , Prognóstico , Transplante Autólogo
18.
World J Surg Oncol ; 9: 4, 2011 Jan 14.
Artigo em Inglês | MEDLINE | ID: mdl-21232154

RESUMO

Carcinoid tumours of the common bile duct represent an extremely rare entity. Similarly, primary follicular lymphomas of the ampulla of Vater constitute an infrequent neoplasia. Herein, we report the first case of a synchronous development of a carcinoid tumour of the common bile duct and an ampullary follicular lymphoma that was treated surgically with a Whipple's procedure, due to inability to establish definitive preoperative diagnosis despite the extensive diagnostic investigation.


Assuntos
Ampola Hepatopancreática , Tumor Carcinoide/patologia , Neoplasias do Ducto Colédoco/patologia , Neoplasias das Glândulas Endócrinas/patologia , Linfoma Folicular/patologia , Neoplasias Primárias Múltiplas/patologia , Adulto , Tumor Carcinoide/cirurgia , Neoplasias do Ducto Colédoco/cirurgia , Neoplasias das Glândulas Endócrinas/cirurgia , Seguimentos , Humanos , Linfoma Folicular/cirurgia , Masculino , Neoplasias Primárias Múltiplas/cirurgia
19.
Surg Today ; 41(5): 620-9, 2011 May.
Artigo em Inglês | MEDLINE | ID: mdl-21533932

RESUMO

Ischemic preconditioning is one of the therapeutic interventions aiming at preventing ischemia/reperfusion-related injury. Numerous experimental studies and a few clinical series have shown that during liver resections, ischemic preconditioning is a promising strategy for optimizing the postoperative outcome. Moreover, various types of pharmacological intervention as well as different types of preconditioning, such as remote preconditioning, the use of heat shock, and hyperbaric oxygen, have been developed to attenuate the functional impairment accompanying ischemia/reperfusion injury. This review summarizes the various forms of preconditioning, thus suggesting that close cooperation between surgeons and anesthesiologists paves the way to apply novel strategies to improve the outcome of liver resection.


Assuntos
Hepatectomia , Precondicionamento Isquêmico/métodos , Fígado/irrigação sanguínea , Traumatismo por Reperfusão/prevenção & controle , Traumatismo por Reperfusão/fisiopatologia , Animais , Humanos , Fígado/fisiopatologia
20.
Int J Gynecol Pathol ; 29(5): 501-4, 2010 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-20736781

RESUMO

Myoepithelial tumors of the vulva are extremely rare, with only 8 cases reported in the literature to date. We report the first case of a high-grade myoepithelial vulvar carcinoma diagnosed in a 35-year-old woman during the 27th week of her pregnancy. The patient initially underwent a wide local excision of the lesion but noted rapid regrowth of the vulvar mass during the next 2 months before her delivery. Shortly thereafter, she underwent a classic radical Taussig-Basset total radical vulvectomy, bilateral superficial and deep inguinal groin node dissection, partial vaginectomy, and reconstruction of the vulva. However, the patient rapidly developed both locoregional and distant mestatatic disease, despite aggressive chemoradiotherapy, and she eventually succumbed to disseminated disease almost 20 months after her initial diagnosis.


Assuntos
Abscesso/patologia , Glândulas Vestibulares Maiores/patologia , Mioepitelioma/patologia , Complicações na Gravidez/patologia , Neoplasias Vulvares/patologia , Adulto , Antineoplásicos/uso terapêutico , Terapia Combinada , Diagnóstico Diferencial , Evolução Fatal , Feminino , Procedimentos Cirúrgicos em Ginecologia , Humanos , Recidiva Local de Neoplasia/tratamento farmacológico , Recidiva Local de Neoplasia/cirurgia , Gravidez , Radioterapia
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