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1.
Chemosphere ; 65(7): 1087-93, 2006 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-16762395

RESUMO

The effectiveness of a novel nickel-antimony doped tin oxide electrode for electrochemical degradation of organic pollutants was investigated using 4-chlorophenol (4-CP) as a model toxic organic. The experimental results demonstrate that the optimal Ni content was at Ni:Sn=1:500 in atomic ratio in the precursor coating solution, whereas the Sb:Sn ratio was set at 8:500. Using the electrode prepared with the optimal Ni doping ratio for 4-CP degradation, the charge-based efficiencies were up to 89 microg C(-1) for 4-CP destruction and 15 microg C(-1) for TOC removal, which were considerably higher than the efficiencies observed for other electrodes. It is suggested that the enhancement of the electrode for electrochemical oxidation of organics could be attributed to the production of hydroxyl radicals in anodic water electrolysis.


Assuntos
Clorofenóis/química , Poluentes Químicos da Água , Purificação da Água/métodos , Antimônio/química , Eletroquímica , Eletrodos , Níquel/química , Compostos de Estanho/química
2.
Transplantation ; 73(3): 465-9, 2002 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-11884946

RESUMO

INTRODUCTION: In liver transplant recipients with Epstein-Barr virus (EBV) disease, we reported a low rate of acute rejection after stopping or markedly lowering immunosuppression. This observation led to the hypothesis that EBV, as a means of viral persistence, induces expression of antiapoptotic factors and these factors, in turn, confer protection to the transplanted organ. Bcl-2, an antiapoptotic factor induced by EBV in various host cells, is not normally expressed in the liver. We questioned whether bcl-2 is expressed in the transplanted liver and whether its expression is modified by EBV. MATERIALS AND METHODS: Retrospective liver biopsy specimen from liver transplant patients diagnosed with EBV (n=12) were examined for the presence of bcl-2 by immunohistochemistry and compared with EBV (-) transplant (n=15), and nontransplant (n=13) livers. RESULTS: The most significant finding was the presence of endothelial bcl-2 expression in the majority of EBV (+) transplant samples examined (67%) and its relative absence in the other two groups (P<0.005). There was also bcl-2 expression in the hepatocytes and lymphocytes of the majority of transplant liver samples, irrespective of EBV status. DISCUSSION: We have identified a strong association between EBV infection and endothelial bcl-2 expression in transplant livers. We also found that transplantation, in itself, was associated with bcl-2 expression in the hepatocytes and lymphocytes of liver allografts.


Assuntos
Endotélio Vascular/química , Infecções por Vírus Epstein-Barr/etiologia , Transplante de Fígado/efeitos adversos , Proteínas Proto-Oncogênicas c-bcl-2/análise , Rejeição de Enxerto , Hepatócitos/química , Humanos , Linfócitos/química , Estudos Retrospectivos , Transplante Homólogo
3.
AJR Am J Roentgenol ; 177(6): 1339-45, 2001 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-11717079

RESUMO

OBJECTIVES: We examined the impact of the increased sensitivity for hypervascular masses of multidetector CT hepatic arteriography on treatment decisions involving selective chemoembolization of hepatocellular carcinomas. SUBJECTS AND METHODS: Thirty patients were referred for chemoembolization of unresectable hepatocellular carcinoma. Initial selective chemoembolization plans were formulated on the basis of diagnostic biphasic CT or MR imaging. Ultrafast CT hepatic arteriography was performed using a multidetector CT scanner and selective contrast material injection into the hepatic artery. The entire liver was scanned in a single breath-hold of approximately 20 sec with a slice thickness of 1 mm. Lesions and their arterial supplies were identified, and these data were immediately used to formulate a final plan for chemoembolization. RESULTS: Hypervascular masses were detected in 29 patients. In 16 (53%) of the patients, preprocedural CT or MR imaging underestimated the number of lesions. In nine (30%) of these 16 patients, the additional lesions were detected only on CT hepatic arteriography, not on conventional angiography. CT hepatic arteriography findings had a major impact on planning the way in which chemoembolization treatment was performed. In three of the nine patients, the previously undetected lesions were treated with additional superselective chemoembolization. In the other six patients, chemoembolization was performed less selectively than originally planned. CONCLUSION: Primarily because of the high sensitivity of multidetector CT hepatic arteriography in revealing small and multifocal hepatomas, findings of this modality frequently alter treatment plans involving selective administration of chemoembolic material.


Assuntos
Carcinoma Hepatocelular/diagnóstico por imagem , Carcinoma Hepatocelular/terapia , Quimioembolização Terapêutica , Artéria Hepática/diagnóstico por imagem , Neoplasias Hepáticas/diagnóstico por imagem , Neoplasias Hepáticas/terapia , Adulto , Idoso , Idoso de 80 Anos ou mais , Angiografia/métodos , Estudos de Viabilidade , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Tomografia Computadorizada por Raios X/métodos
5.
Pediatr Transplant ; 3(1): 22-6, 1999 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-10359027

RESUMO

In recent years, tacrolimus (FK506, TAC) has been increasingly utilized in liver transplantation. However, long-term risks and benefits as compared with conventional cyclosporin A (CsA) have not been fully elucidated. This retrospective study examined the potential outcome differences between TAC- and CsA-based immunosuppressive therapy in pediatric liver transplant recipients. From March 1988 to December 1996, 218 children (aged 0.1-17 yr) underwent 238 orthotopic liver transplantations; 58.7% (128/218) were under 2 yr of age at time of transplant. Initially, the maintenance immunosuppressive regimen consisted of CsA and prednisone, with antilymphocytic preparations (MALG, ATGAM, and OKT3) as induction therapy. Subsequently, TAC was used first as rescue therapy for steroid refractory rejection in CsA patients and then as maintenance immunosuppression. Fifty-seven out of the 147 CsA patients were converted to TAC for various reasons while 71 patients were placed on TAC as primary maintenance immunosuppression. 62.6 per cent (92/147) of liver recipients on CsA experienced at least one biopsy-proven acute rejection episode as compared to 50.7% (36/71) for TAC patients (p = 0.09); likewise, 34% (50/147) of CsA patients had more than one episode of rejection vs. 18.3% (13/71) for patients on TAC (p < 0.02). Rejection was the reason for conversion from CsA to TAC in 29 of 57 patients. Conversely, 19.0% (28/147) of CsA patients had to be switched to TAC for reasons not related to rejection (i.e. side-effects). The overall incidence of histologically proven chronic rejection was 7.8% (17/218). 10.9 per cent (16/147) of the children who were on CsA initially developed chronic rejection, which was significantly higher compared with one of 71 TAC recipients (p < 0.02). Of these 16 CsA patients with chronic rejection, 50.0% (8/16) underwent retransplantation for graft failure (mean interval from time of diagnosis of chronic rejection to re-transplant, 4.0 months; range 1-8 months), whereas the TAC patient has remained clinically stable with normal liver function tests after 23 months of follow-up. One year after liver transplantation, 72.8% (107/147) of CsA patients were still on steroids (mean dosage 0.20 mg/kg/d), as compared to 42.3% (30/71) of the TAC patients (mean dosage 0.14 mg/kg/d). The incidence of post-transplant lymphoproliferative disorder (PTLD) in Epstein-Barr virus (EBV)-infected patients was 2.2% (2/90), 7.0% (5/71) and 12.3% (7/57) for CsA, primary and TAC-converted groups, respectively. The overall incidence of PTLD was 6.9% (15/218). In summary, pediatric liver transplant recipients treated with TAC as primary maintenance immunosuppressive medication experienced significantly fewer episodes of rejection; especially chronic rejection, which lead to graft loss. However, the trade-off is a potential increased incidence of EBV-related PTLD in these patients.


Assuntos
Ciclosporina/uso terapêutico , Imunossupressores/uso terapêutico , Transplante de Fígado/efeitos adversos , Transplante de Fígado/imunologia , Tacrolimo/uso terapêutico , Doença Aguda , Adolescente , Criança , Pré-Escolar , Doença Crônica , Ciclosporina/imunologia , Rejeição de Enxerto/etiologia , Rejeição de Enxerto/patologia , Infecções por Herpesviridae/etiologia , Herpesvirus Humano 4 , Humanos , Imunossupressores/imunologia , Lactente , Testes de Função Hepática , Estudos Retrospectivos , Tacrolimo/imunologia , Resultado do Tratamento , Infecções Tumorais por Vírus/etiologia
6.
J Gastroenterol Hepatol ; 14 Suppl: S28-31, 1999 May.
Artigo em Inglês | MEDLINE | ID: mdl-10382635

RESUMO

Thirty consecutive, major liver resections performed with total vascular exclusion in both non-cirrhotic and cirrhotic patients were analysed retrospectively. The patients' ages ranged from 6 months to 80 years. Ten were Asians and five had cirrhosis associated with chronic hepatitis B or C. There was no perioperative death and the mean hospital stay was 6 days for adults and 9.2 days for children. The average vascular exclusion or warm ischaemia time was 25 min (range 10-55 min) and the average intraoperative blood volume given was 275 mL (range 0-3000 mL) packed red blood cells. Sixty per cent required no intraoperative blood transfusion. The mean total bilirubin and aspartate aminotransferase were 1.0 mg/dL (range 0.3-2.3 mg/dL) and 84 IU/L (range 14-306 IU/L) when measured prior to discharge at postoperative day 4-7. In our experience, total vascular exclusion is invaluable in major or difficult liver resections, especially lesions adjacent to the hepatic veins and vena cava. It is associated with a low blood transfusion requirement and a low incidence of complications. It further obviates the need for dissection of the porta hepatis and its associated risks. Total vascular exclusion time of 30 min appears to be well tolerated, even in patients with compensated cirrhosis.


Assuntos
Hepatectomia/métodos , Adulto , Idoso , Idoso de 80 Anos ou mais , Pré-Escolar , Hepatite B Crônica/complicações , Hepatite C Crônica/complicações , Humanos , Lactente , Cirrose Hepática/cirurgia , Pessoa de Meia-Idade , Complicações Pós-Operatórias , Estudos Retrospectivos
7.
J Gastroenterol Hepatol ; 14 Suppl: S37-41, 1999 May.
Artigo em Inglês | MEDLINE | ID: mdl-10382637

RESUMO

Hepatocellular carcinoma is responsible for more than 1 million deaths per year worldwide and thus remains a challenging medical problem. It causes few or no symptoms and the tumour frequently reaches an enormous size by the time of diagnosis in countries where screening is seldom used. It is generally resistant to commercially available anti-neoplastic agents and radiation therapy. The principal treatment continues to be resection, either partial or complete, with liver transplantation. However, less than one-third of patients are surgical candidates for either resection or transplantation at the time of clinical presentation. This review will address the results observed following resection or transplantation for hepatocellular carcinoma.


Assuntos
Carcinoma Hepatocelular/cirurgia , Hepatectomia , Neoplasias Hepáticas/cirurgia , Transplante de Fígado , Humanos
8.
J Gastroenterol Hepatol ; 14 Suppl: S48-52, 1999 May.
Artigo em Inglês | MEDLINE | ID: mdl-10382639

RESUMO

To assess whether Asian race is an independent variable affecting survival and hepatitis B virus (HBV) recurrence after liver transplantation, the results of 27 consecutive liver transplants performed between June 1994 and April 1997 for HBV cirrhosis were analysed. In the group of 13 Asians, 38% had associated hepatocellular carcinoma and 62% had positive hepatitis B virus early antigen (HBeAg) or elevated HBV-DNA before transplant. Prophylactic hepatitis B immunoglobulin (HBIG) was administered perioperatively and long term at 4-6 weekly interval. Four patients with elevated HBV-DNA received lamivudine before transplantation. The 3 year actuarial patient survival rate was 100% in both Asian and non-Asian patients. Twenty-six patients remained seronegative for hepatitis B virus surface antigen after transplantation. The incidence of post-transplant HBV recurrence was similar: 0% in Asians compared with 7% in non-Asians. There was no recurrence in the group of 12 patients who were HBV-DNA or HBeAg negative pretransplant.


Assuntos
Povo Asiático , Hepatite B/complicações , Cirrose Hepática/cirurgia , Transplante de Fígado/mortalidade , Adolescente , Adulto , Carcinoma Hepatocelular/complicações , Antígenos E da Hepatite B/análise , Humanos , Imunização Passiva , Imunoglobulinas/imunologia , Terapia de Imunossupressão , Lamivudina/uso terapêutico , Cirrose Hepática/etiologia , Neoplasias Hepáticas/complicações , Metilprednisolona/uso terapêutico , Pessoa de Meia-Idade , Recidiva , Inibidores da Transcriptase Reversa/uso terapêutico , Taxa de Sobrevida
9.
Arch Surg ; 134(1): 25-9, 1999 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-9927126

RESUMO

OBJECTIVE: To evaluate the effect of intraoperative transfusion of red blood cells (RBCs) on patient and graft survival. DESIGN: A retrospective study. SETTING: A tertiary care referral center. PATIENTS: Between January 1, 1992, and December 31, 1994, medical records from 225 adult patients who underwent primary liver transplantations were analyzed. RESULTS: Overall patient survival was 90% at 1 year and 86% at 3 years, while graft survival was 89% at 1 year and 85% at 3 years. The following factors were associated with patient and graft survival: age, sex, medical condition at the time of transplantation, and intraoperative transfusion of RBCs. When these factors were subjected to a multivariate analysis, all were independently associated with survival. Fifty-four recipients (24%) underwent transplantation without intraoperative transfusion of RBCs, while 171 recipients (76%) received at least 1 U of RBCs intraoperatively. Recipients who did not receive transfusion of RBCs had higher patient and graft survival rates than patients who did receive RBCs. By multivariate analysis, transplantation without intraoperative transfusion of RBCs no longer remained statistically significant, and only sex and the patient's medical condition were independently associated with patient and graft survival. Patient and graft survival decreased if 5 or more U were transfused, but transfusion of 5 or more U was not independently associated with survival by multivariate analysis. CONCLUSIONS: Increased transfusion requirement for RBCs was independently associated with patient and graft survival. While transplantation without transfusion of intraoperative RBCs was associated with superior patient and graft survival, these effects were overridden by patient sex and medical condition at the time of transplantation.


Assuntos
Transfusão de Eritrócitos , Cuidados Intraoperatórios , Transplante de Fígado , Feminino , Sobrevivência de Enxerto , Humanos , Transplante de Fígado/mortalidade , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Taxa de Sobrevida , Resultado do Tratamento
10.
Transplantation ; 66(5): 606-9, 1998 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-9753340

RESUMO

BACKGROUND: Pediatric liver transplant recipients have traditionally been grouped according to age. Age-based classification schemes are useful in identifying clinical problems in selected age groups and also for developing solutions to these problems. Although infants in the first 3 months of life have not traditionally been considered a distinct age group, several features of these infants may distinguish them from other pediatric liver transplant recipients. METHODS: The experience with liver transplantation in infants during the first 3 months of life in three large pediatric liver transplant programs (University of Chicago, Stanford University, and UCLA) was analyzed in order to characterize this group. RESULTS: A total of 23 liver transplants were performed at these three centers in children younger than 3 months of age. This group of patients comprised approximately 37% of the U.S. experience between 1988 and 1994 according to United Network for Organ Sharing statistics. Age distribution at the time of transplantation included the following: <1 month, 28%; 1-2 months, 35%; and 2-3 months, 36%. Median age at the time of transplantation was 37 days (range, 7-90 days), and mean age was 57+/-30 days. Mean weight at the time of transplantation was 3.8+/-1.0 kg. Etiology of liver disease included idiopathic hepatitis, 52%; iron storage disease, 17%; and other causes, 31%. Types of liver allografts used included cadaveric, 85% (reduced size, 60%, and full-size, 25%); living donor, 15%; ABO-identical, 65%; and ABO-compatible, 35%. Actuarial patient and graft survival rates were 60% and 60% at 1 year and 60% and 42% at 2 years, respectively. Median follow-up was 1.5 years. Rejection occurred in 42% of patients, with a median time to first rejection of 13 days. Of these patients, 28% required steroids only and 14% required OKT3. Three patients (14%) were retransplanted at a median time to retransplantation of 1.6 years. Vascular thrombosis occurred in three patients (14%). CONCLUSIONS: Liver transplantation performed in infants younger than 3 months of age (1) provides acceptable short- and long-term patient and graft survival, (2) is associated with significant rates of rejection, and (3) is not associated with excessive rates of vascular thrombosis. The etiology of end-stage liver disease occurring in the first 3 months of life is distinct from that in other pediatric liver transplant recipient age groups. These infants should be referred promptly for liver transplantation as reasonable survival can be expected.


Assuntos
Transplante de Fígado , Avaliação de Processos e Resultados em Cuidados de Saúde , Soro Antilinfocitário/uso terapêutico , Ciclosporina/uso terapêutico , Feminino , Rejeição de Enxerto , Humanos , Imunossupressores/uso terapêutico , Lactente , Recém-Nascido , Masculino , Muromonab-CD3/uso terapêutico , Tacrolimo/uso terapêutico
11.
Liver Transpl Surg ; 4(3): 208-14, 1998 May.
Artigo em Inglês | MEDLINE | ID: mdl-9563959

RESUMO

Autoimmune liver diseases (AILD) may progress to liver failure, requiring liver transplantation as definitive therapy, and these immune-mediated disorders may predispose the patient to more frequent graft rejection. The objective of this study was to determine the effect of preexisting AILD on the incidence of allograft rejection after liver transplantation. Sixty-three patients who underwent liver transplantation between March 1988 and December 1994 for AILDs that included autoimmune hepatitis (AIH; n = 33) and primary biliary cirrhosis (PBC; n = 30) were retrospectively compared with 47 patients who underwent liver transplantation for alcoholic cirrhosis during the same time period. There was a lower incidence of acute allograft rejection in patients with AILD who received tacrolimus-based compared with cyclosporine-based immunosuppression (50% v 85.5%; P = .02). However, patients with AILDs overall had a higher incidence of acute rejection than patients with alcoholic cirrhosis (81% v 46.8%; P < .001), regardless of the type of immunosuppression. In addition, steroid-resistant rejection occurred more frequently in patients with AILDs than in patients with alcoholic cirrhosis (38.1% v 12.8%; P = .003). There was also a trend toward a higher incidence of chronic rejection in patients with AILDs compared with patients with alcoholic cirrhosis (11.1% v 2.1%), but this difference did not reach statistical significance. Patient and graft survivals at 1 and 3 years were similar between patients with AILDs and alcoholic liver disease. Compared with alcoholic cirrhosis, preexisting AILDs are associated with a higher incidence of acute allograft rejection and a trend toward more frequent chronic rejection.


Assuntos
Doenças Autoimunes/cirurgia , Rejeição de Enxerto , Hepatite Autoimune/cirurgia , Cirrose Hepática/cirurgia , Transplante de Fígado , Adulto , Doenças Autoimunes/mortalidade , Estudos de Casos e Controles , Distribuição de Qui-Quadrado , Ciclosporina/administração & dosagem , Feminino , Hepatite Autoimune/mortalidade , Humanos , Imunossupressores/administração & dosagem , Cirrose Hepática/mortalidade , Masculino , Pessoa de Meia-Idade , Prednisona/administração & dosagem , Estudos Retrospectivos , Estatísticas não Paramétricas , Tacrolimo/administração & dosagem , Transplante Homólogo
12.
Transplantation ; 65(1): 77-82, 1998 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-9448148

RESUMO

BACKGROUND: To assess the feasibility and outcome of a piggyback technique without caval occlusion or veno-venous bypass (VB), we retrospectively reviewed 131 consecutive adult orthotopic liver transplantation (OLT) performed in 129 patients between May 1993 and February 1995. Six were second transplants, and six were combined liver-kidney transplants. The piggyback technique was attempted in all cases. METHODS: We were able to perform the piggyback technique in 98 OLTs (75%). The remaining 33 OLTs (25%) were converted to the standard technique; of these, 20 (15%) required VB. The reasons for conversion to the standard technique were: anatomical (22 transplants), severe portal hypertension requiring VB (8 transplants), tumor (1 transplant), and other reasons (2 transplants). Six retransplantations were performed (four piggyback, two standard). RESULTS: There was no significant difference in age, United Network for Organ Sharing status, Child's classification, and diagnosis between the patients in whom piggyback was possible or not. The actuarial patient and graft survival at 1 year were similar between the piggyback group and the group of patients converted to standard technique (87/85% vs. 86/86%, respectively). No death was related to either technique. With piggyback, the average operative time was 8.6+/-1.9 hr, median amount of blood transfused intraoperatively was 2 U (33% did not require transfusion), and median intensive care unit and hospital stays were 3 and 11 days, respectively. With the piggyback technique, the mean preoperative and maximum postoperative serum creatinine levels were 1.4+/-1.0 and 1.8+/-1.5 mg/dl. CONCLUSION: The piggyback technique without caval occlusion is possible in the majority of patients. It is safe and has reduced the use of VB to 15% of our adult OLTs. The piggyback technique avoids retrocaval dissection, facilitates retransplantation, and is associated with a short anhepatic phase, low blood product usage, and short intensive care unit stay.


Assuntos
Transplante de Fígado/métodos , Veia Cava Inferior/cirurgia , Adolescente , Adulto , Anastomose Cirúrgica/métodos , Feminino , Veias Hepáticas/cirurgia , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Técnicas de Sutura , Resultado do Tratamento
13.
Clin Transpl ; : 287-96, 1998.
Artigo em Inglês | MEDLINE | ID: mdl-10503106

RESUMO

Because of the unique demographics of our patient population, we have had the opportunity to dedicate further studies of the management of hepatitis B and hepatitis C. We have experienced a very low HBV recurrence rate with the use of HBIG in patients transplanted for hepatitis B. Investigations, including the use of new antiviral agents, and the development of approaches to minimize or abrogate disease recurrence such as lower levels of immunosuppression are ongoing. Using a standardized approach to the proper evaluation and selection of patients for liver transplantation with alcoholic liver disease or other liver diseases with coexistent alcohol abuse, we report favorable long-term results in these patients. We have reviewed our results and our approach to the management of EBV and posttransplant lymphoproliferative disorder. There is a firm commitment in our laboratories and outpatient clinics to the investigation of disease prevention, reliable detection and screening methods, and treatment modalities for EBV-related disease. We have addressed specific technical considerations to pediatric liver transplant and have discussed unique aspects of postoperative management in these patients. One-third of the transplants performed at Stanford are in children, 42% of whom are less than one year old. Results with our pediatric transplant recipients compare favorably with those of our adult recipients with patient and graft survival rates approaching 90% at one year and exceeding 80% at 46 months for both groups. As a response to the limited organ supply, we have extended our criteria for suitable donors. Most notably, we have utilized older donors and grafts with significant microsteatosis and have observed good results with these grafts as long as ischemia time is minimized. We have also successfully used reduced size grafts for our pediatric patients with good results and are continuing to expand the use of living-related partial grafts and split allografts.


Assuntos
Transplante de Fígado/estatística & dados numéricos , Adolescente , Adulto , California , Carcinoma Hepatocelular/cirurgia , Criança , Pré-Escolar , Sobrevivência de Enxerto , Hepatite B/cirurgia , Hepatite C/cirurgia , Hospitais Universitários/estatística & dados numéricos , Humanos , Hepatopatias/classificação , Hepatopatias/cirurgia , Hepatopatias Alcoólicas/cirurgia , Neoplasias Hepáticas/cirurgia , Transplante de Fígado/mortalidade , Transplante de Fígado/fisiologia , Seleção de Pacientes , Estudos Retrospectivos , Taxa de Sobrevida
14.
Pediatr Transplant ; 2(2): 106-16, 1998 May.
Artigo em Inglês | MEDLINE | ID: mdl-10082442

RESUMO

This review discusses the indications for orthotopic liver transplantation (OLT) in children and provides guidelines for the appropriate time to list children for transplant. The diseases for which OLT are indicated in children are divided into diagnostic categories with a focus on the natural history and appropriate medical and surgical therapy prior to transplantation. Contraindications to transplantation pertinent to specific diseases are outlined, with particular emphasis on complex metabolic defects with extrahepatic manifestations. The clinical conditions which indicate that listing for OLT is appropriate, as well as the relative and absolute contraindications, irrespective of diagnosis, are discussed. The importance of malnutrition and poor development as listing criteria is stressed. Special timing considerations for diagnoses relevant to the pediatric age group, e.g. urea cycle defects and Crigler-Najjar syndrome, are emphasized. Finally, the impact of co-existing extrahepatic disease on the decision to list children for OLT is reviewed.


Assuntos
Hepatopatias/cirurgia , Transplante de Fígado , Doenças Metabólicas/cirurgia , Criança , Contraindicações , Humanos , Fatores de Tempo
15.
Liver Transpl Surg ; 3(6): 628-37, 1997 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-9404965

RESUMO

This report summarizes a recent meeting cosponsored by the American Society of Transplant Physicians and the American Association for the Study of Liver Diseases to formulate minimal criteria by which patients with severe liver disease will be placed on the waiting list for liver transplantation. The participants agreed that only patients in immediate need of liver transplantation should be placed on the waiting list. Patients should not be placed in anticipation of some future need for such therapy. It was agreed that minimal criteria could assist but not replace the clinical judgment of the transplant professionals at individual centers. The criteria will be summarized below for adult patients with acute or chronic liver disease. The most important non-disease-specific criterion for placement on the transplant waiting list was an estimated 90% chance of surviving 1 year. This translated into a Child-Pugh score of > or = 7 for patients with cirrhosis which places the patient in Child-Pugh class B or C. Cirrhotic patients who have experienced gastrointestinal bleeding caused by portal hypertension or a single episode of spontaneous bacterial peritonitis would meet the minimal criteria irrespective of their Child-Pugh score. There were disease-specific criteria also. These include a sole minimal criterion for patients with fulminant hepatic failure regardless of etiology of the onset of stage 2 hepatic encephalopathy. A requirement for 6 months abstinence from alcohol before placement on the transplant waiting list was considered appropriate for most patients with alcoholic liver disease. Exceptional cases could get access to the waiting list through a regional review process. Chronic cholestatic diseases present difficulties because of a different natural history than that of chronic hepatocellular diseases. The use of specific risk scores for primary biliary cirrhosis and primary sclerosing cholangitis will likely replace Childs-Pugh classification as the scoring systems become refined. Minimal criteria for any patient with a primary hepatocellular cancer would admit any patient with a tumor confined to the liver irrespective of size or number of tumors, after careful investigation had failed to show spread to lymph nodes, the portal vein, or distant organs. Unusual or rare indications for liver transplantation, including Budd-Chiari syndrome, Wilson's disease, and other hereditary disorders, were also discussed. Finally, it was agreed that there should be no absolute contraindications to placement of patients on the liver transplant waiting list. These criteria should be open to regular review to accommodate advances in the field.


Assuntos
Hepatopatias/cirurgia , Transplante de Fígado , Seleção de Pacientes , Obtenção de Tecidos e Órgãos/normas , Listas de Espera , Adulto , Colangite Esclerosante/cirurgia , Encefalopatia Hepática/cirurgia , Humanos , Cirrose Hepática Biliar/cirurgia , Hepatopatias Alcoólicas/cirurgia , Neoplasias Hepáticas/cirurgia
17.
Arch Surg ; 132(8): 842-7; discussion 847-9, 1997 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-9267267

RESUMO

BACKGROUND: Nationally, results of renal transplantation in children, particularly in small children, are inferior to those obtained in adults. OBJECTIVE: To determine factors important for success in renal transplantation in children. DESIGN: Results of 108 consecutive renal transplantations performed in patients aged 7 months to 18 years were reviewed and compared with those reported by the North American Pediatric Renal Transplant Cooperative Study (NAPRTCS), the national registry. RESULTS: One-, 2-, and 3-year graft survival rates (+/-SE) were 99% +/- 1%, 95% +/- 3%, and 93% +/- 4%, respectively, for living donor grafts and 97% +/- 3%, 92% +/- 6%, and 92% +/- 6%, respectively, for cadaver grafts. Incidence of acute rejection was half that reported by NAPRTCS. There were no graft losses for technical reasons (19% in NAPRTCS). Twelve percent of patients were younger than 2 years (6% in NAPRTCS); 17% were 2 to 5 years old (16% in NAPRTCS). Most small children received an adult-sized kidney. Ninety-three percent of recipients weighing 15 kg or less received postoperative mechanical ventilation assistance to optimize fluid resuscitation and perfusion of adult-sized kidneys. Structural abnormalities of the urinary tract were present in 53.7% of the patients (48.5% in NAPRTCS; adults, 5.3%). Nephroureterectomy was required in 38 children; in 27 (71%) of them, it was performed at the time of transplant surgery. CONCLUSIONS: Excellent results can be obtained in pediatric renal transplantation by strict adherence to surgical detail, tight immunosuppressive management, aggressive fluid management in the small child, and careful integration of urologic and transplant surgery.


Assuntos
Transplante de Rim/mortalidade , Adolescente , Criança , Pré-Escolar , Protocolos Clínicos , Rejeição de Enxerto/epidemiologia , Sobrevivência de Enxerto , Humanos , Terapia de Imunossupressão , Incidência , Lactente , Transplante de Rim/efeitos adversos , Complicações Pós-Operatórias/epidemiologia , Taxa de Sobrevida , Resultado do Tratamento , Sistema Urinário/anormalidades , Sistema Urinário/cirurgia
18.
Transplantation ; 64(2): 242-8, 1997 Jul 27.
Artigo em Inglês | MEDLINE | ID: mdl-9256181

RESUMO

The technical and medical management of small infants requiring orthotopic liver transplantation remains a challenge. The present study examined 117 orthotopic liver transplantations performed in 101 infants from <1 to 23 months of age between March 1988 and February 1995 to determine factors that influence patient and graft outcome. Factors analyzed included etiology of liver disease, recipient and donor age and weight, United Network for Organ Sharing (UNOS) status, retransplantation, ABO-compatibility, full-size (FS) versus reduced-size grafts, vascular thrombosis (VT), including hepatic artery and portal vein (PVT), and the presence of lymphoproliferative disease (LPD). UNOS status 1, fulminant hepatic failure, and the development of Epstein-Barr virus-associated LPD were each associated with 10-20% lower patient and graft survival rates. Of 101 infants, 11 (11%) developed LPD with an associated 36% mortality. VT occurred in 10 (9 hepatic artery and 1 portal vein) of 117 orthotopic liver transplantations (9%), all less than 1 year of age, and was associated with significantly poorer 1-year (50% vs. 85% no VT, P<0.01) and 5-year patient survival rates (50% vs. 83% no VT, P<0.01). One-year graft survival rates for FS grafts in recipients <12 months versus 12-23 months were 67% vs. 94% (P<0.01); the patient survival rate was also significantly lower in FS graft recipients <12 months (76% vs. 100%, P<0.05). Recipients <5 months of age had the worst survival rates: 1-year and 5-year patient survival rates were 65% and 46% for recipients 0-4 months (n=17) versus 82% and 82% for recipients 5-11 months (n=56), and 93% and 93% for recipients age 12-23 months (n=28; P<0.05). In summary, factors associated with reduced survival rates include recipient age <5 months, recipient age <12 months who received FS grafts, development of VT and donor weight <6 kg. There was a trend for UNOS status 1, fulminant hepatic failure, and presence of LPD to be associated with reduced survival rates.


Assuntos
Transplante de Fígado/mortalidade , Envelhecimento/fisiologia , Soro Antilinfocitário/uso terapêutico , Causas de Morte , Ciclosporina/uso terapêutico , Rejeição de Enxerto/etiologia , Rejeição de Enxerto/prevenção & controle , Sobrevivência de Enxerto/fisiologia , Humanos , Lactente , Transplante de Fígado/efeitos adversos , Transplante de Fígado/imunologia , Transtornos Linfoproliferativos/etiologia , Transtornos Linfoproliferativos/mortalidade , Veia Porta , Estudos Retrospectivos , Taxa de Sobrevida , Trombose/etiologia
20.
Hepatology ; 25(1): 223-5, 1997 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-8985294

RESUMO

It has been suggested that Asian patients have reduced survival after liver transplantation because of greater recurrence of hepatitis B virus (HBV). We analyzed the outcome of Asian and non-Asian patients receiving transplants for chronic hepatitis B between May 1988 and March 1994. Baseline Child-Pugh score and United Network for Organ Sharing (UNOS) status, HBV recurrence, and survival were compared between the two groups. All but one patient received variable doses of hepatitis B immune globulin. Mean follow-up of surviving patients was 28 months (range, 3-71 months). Fifteen Asians and 20 non-Asians underwent transplantation. Six of 15 Asians (40%) and 4 of 20 non-Asians (20%) died during the study period. Although Asians had a lower 1-year survival than non-Asians (59% for Asians and 94% for non-Asians), the 5-year actuarial survival was not different (59% and 57% for Asians and non-Asians, respectively). The causes of death in 5 of 6 Asians were factors other than recurrent hepatitis B, and 4 of 5 deaths occurred within 60 days after transplantation. Eighty percent of Asian patients were Child-Pugh class C at referral, compared with 50% of non-Asians, and Asians were more likely to be status 1 at transplantation (40% vs. 10%; P < .05). By contrast, all four deaths in non-Asians occurred late and were secondary to recurrent HBV infection. Of patients surviving more than 60 days after transplantation, 7 of 11 Asians (64%) and 10 of 20 non-Asians (50%) developed recurrent HBV infection (NS). Late mortality attributable to HBV recurrence was lower but not significantly different in Asians (1 of 7 [14%]) than in non-Asians (4 of 10 [40%]). In summary, HBV recurrence and late HBV-related mortality in Asians and non-Asians is similar after liver transplantation for chronic hepatitis B. Late referral and more advanced chronic liver disease at the time of transplantation probably account for the lower 1-year survival of Asians after liver transplantation.


Assuntos
Hepatite B/cirurgia , Transplante de Fígado , Doença Crônica , Hepatite B/mortalidade , Humanos , Imunização Passiva , Imunoglobulinas , Recidiva , Taxa de Sobrevida
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