(Fonte: Lattes)
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Projetos de Pesquisa
Unidades Organizacionais
Instituto da Criança, Hospital das Clínicas, Faculdade de Medicina - Médico
LIM/30 - Laboratório de Investigação em Cirurgia Pediát, Hospital das Clínicas, Faculdade de Medicina

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Agora exibindo 1 - 10 de 20
  • article 6 Citação(ões) na Scopus
    Living donor liver transplantation in children: Should the adult donor be operated on by an adult or pediatric surgeon? Experience of a single pediatric center
    (2014) ANDRADE, Wagner de Castro; VELHOTE, Manoel Carlos Prieto; AYOUB, Ali Ahman; SILVA, Marcos Marques; GIBELLI, Nelson Elias M.; TANNURI, Ana Cristina A.; SANTOS, Maria Merces; PINHO-APEZZATO, Maria Lucia; BARROS, Fabio de; MOREIRA, Daniel Rangel; MIYATANI, Helena T.; PEREIRA, Raimundo Renato; TANNURI, Uenis
    Background/Purpose: Living donor liver transplantation has become a cornerstone for the treatment of children with end-stage hepatic dysfunction, especially within populations or countries with low rates of organ utilization from deceased donors. The objective is to report our experience with 185 living donors operated on by a team pediatric surgeons in a tertiary center for pediatric liver transplantation. Methods: Retrospective analysis of medical records of donors of hepatic grafts for transplant undergoing surgery between June 1998 and March 2013. Results: Over the last 14 years, 185 liver transplants were performed in pediatric recipients of grafts from living donors. Among the donors, 166 left lateral segments (89.7%), 18 left lobes without the caudate lobe (9.7%) and 1 right lobe (0.5%) were harvested. The donor age ranged from 16 to 53 years, and the weight ranged from 47 to 106 kg. In 10 donors, an additional graft of the donor inferior mesenteric vein was harvested to substitute for a hypoplastic recipient portal vein. The transfusion of blood products was required in 15 donors (8.1%). The mean hospital stay was 5 days. No deaths occurred, but complications were identified in 23 patients (12.4%): 9 patients experienced abdominal pain and severe gastrointestinal symptoms and 3 patients required reoperations. Eight donors presented with minor bile leaks that were treated conservatively, and 3 patients developed extra-peritoneal infections (1 wound collection, 1 phlebitis and 1 pneumonia). Eight grafts (4.3%) showed primary dysfunction resulting in recipient death (3 cases of fulminant hepatitis, 1 patient with metabolic disease, 1 patient with Alagille syndrome and 3 cases of biliary atresia in infants under 1 year old). There was no relation between donor complications and primary graft dysfunction (P = 0.6). Conclusions: Living donor transplantation is safe for the donor and presents a low morbidity. The donor surgery may be performed by a team of trained pediatric surgeons.
  • article 10 Citação(ões) na Scopus
    Extensive Hepatectomy as an Alternative to Liver Transplant in Advanced Hepatoblastoma: A New Protocol Used in a Pediatric Liver Transplantation Center
    (2019) PAGANOTI, G. de Freitas; TANNURI, A. C. A.; MARQUES, A. C. Dantas; TORRES, R. R.; GIBELLI, N. E. Mendes; TANNURI, U.
    Background. Surgery is a key factor in the treatment of hepatoblastoma, but choosing between an aggressive resection and liver transplant may be an extremely difficult task. The aim of this study was to describe the outcomes of patients with advanced hepatoblastoma: pretreatment extent of disease (PRETEXT)/post-treatment extent of disease (POST-TEXT) III and IV undergoing aggressive resections or living donor liver transplant in cases involving the entire liver. Based on this experience, a new protocol for the treatment of these patients was proposed. Methods. A retrospective study included patients with advanced hepatoblastoma (POST-TEXT III and IV) who were referred for a liver transplant from 2010 to 2017. Results. A total of 24 children were included: 13 (54.2%) were male, with a median age at diagnosis of 42 months (range, 15-120 months), and a history of prematurity was identified in 20.8% of the patients. Ten cases (41.7%) were staged as PRETEXT/POST-TEXT III, and 12 cases (50.0%) were staged as PRETEXT/POST-TEXT IV. Two patients were referred after posthepatectomy recurrence. Five patients underwent a liver transplant, with recurrence and death in 2 patients (40.0%) within a mean period of 6 months. In the extensive hepatectomy group, there was recurrence in 6 patients (31.6%), with disease-free outcomes and overall survival in 63.2% and 94.7% of patients, respectively. Conclusion. In cases of advanced hepatoblastoma, an extensive surgical approach is a valuable option. The fact that the team was fully prepared to proceed with living donor liver transplant allowed the surgeon to be more aggressive and to switch to transplantation when resection was not possible.
  • article 0 Citação(ões) na Scopus
    Liver Regeneration Model in Growing Rats With Hepatic Artery Ligation: Histologic and Molecular Studies
    (2015) BACKES, A. Nadia; TANNURI, A. C. Aoun; COELHO, M. C. Mendonca; GIBELLI, N. E. Mendes; BACKES, F. N.; TANNURI, U.
    Background. Liver transplantation is an effective treatment for irreversible liver diseases. The incidence of hepatic artery thrombosis remains high. Our objective was to analyze the effect of ligature of the hepatic artery on liver regeneration in a growing animal model. Methods. Seventy-five male Wistar rats were divided into the following 3 groups: group 1 (sham, G1): incision without intervention; group 2 (G2): 70% hepatectomy; group 3 (G3): 70% hepatectomy and ligation of the hepatic artery. Preceding the 70% hepatectomy, a hepatic artery ligature was performed with resection of a segment of the artery. The liver specimens were stained with hematoxylin-eosin, and immunohistochemical staining for Ki-67 was performed. The expression of the interleukin (IL) 6 gene was studied by means of reverse-transcription polymerase chain reaction. Results. G2 and G3 demonstrated similar tendencies toward an increase in the gain weight ratio over time. The mitotic activity was significantly lower at 72 hours in G3 than in G2. There was no difference between Ki-67 staining between G2 and G3. The expression of the IL-6 gene was present in all of the groups, lower in G1, with no difference between G2 and G3. Conclusions. The experimental model was feasible and adequate for these investigations. Hepatectomy stimulated hepatocyte proliferation, and the obstruction of the arterial flow did not affect liver regeneration.
  • article 10 Citação(ões) na Scopus
    The role of interleukin-6, endothelins, and apoptotic genes in small bowel transplantation, in a swine model of ischemia and reperfusion injury
    (2011) PINHO-APEZZATO, Maria Lucia de; MAKSOUD-FILHO, Joao Gilberto; VALINETTI, Emilia Aparecida; SANTOS, Maria Merces; TANNURI, Ana Cristina Aoun; MELLO, Evandro Sobroza; SILVA, Luiz Fernando; COELHO, Maria Cecilia de Mendonca; GIBELLI, Nelson Elias Mendes; ROCHA, Rafael Malagoli; NONOGAKI, Suely; GUIMARAES, Raimundo Renato Nunes; TANNURI, Uenis
    IRI is closely related to sepsis in ITx setting. Complete understanding of the mechanisms involved in IRI development may improve outcomes. Ortothopic ITx without immunosuppression was performed in order to characterize IRI-associated mucosal damage. Twenty pigs underwent ITx. Two groups were assigned to different CI times: G1: 90 min and, G2: 180 min. Euro-Collins was used as preservation solution. Jejunal fragments were collected at donor laparotomy, 30 min, and 3 days after reperfusion. IRI assessment involved: histopathologic analysis, quantification of MPO-positive cells through immunohistochemical studies, quantification of epithelial apoptotic cells using TUNEL staining, and quantification of IL-6, ET-1, Bak, and Bcl-XL genes expression by RT-PCR. Neutrophilic infiltration increased in a similar fashion in both groups, but lasted longer in G2. Apoptosis detected by TUNEL staining increased and anti-apoptotic gene Bcl-XL expression decreased significantly in G1, 3 days after surgery. Endothelin-1 and IL-6 genes expression increased 30 min after the procedure and returned to baseline 3 days after surgery. In conclusion, IL-6 and ET-1 are involved precociously in the development of intestinal IRI. Apoptosis was more frequently detected in G1 grafts by TUNEL-staining and by RT-PCR.
  • article 37 Citação(ões) na Scopus
    Living Related Donor Liver Transplantation in Children
    Objective. The objective of this study was to report our experience with pediatric orthotopic liver transplantation (OLT) with living related donors. Methods. We performed a retrospective chart analysis of 121 living related donor liver transplantations (LRDLT) from June 1998 to June 2010. Results. Indications were biliary atresia (BA; n = 81), primary sclerosing cholangitis (n = 5), alpha-1 antitrypsin deficiency (n = 4); cholestasis (n = 9), fulminant hepatic failure (n = 8), autoimmune hepatitis (n = 2), Alagille syndrome (n = 4), hepatoblastoma (n = 3), tyrosinemia (n = 2), and congenital hepatic fibrosis (n = 3). The age of the recipients ranged from 7-174 months (median, 22) and the weights ranged from 6-58 kg (median, 10). Forty-nine children (40.5%) weighed <= 10 kg. The grafts included the left lateral segment (n = 108), the left lobe (n = 12), and the right lobe (n = 1). The donors included 71 mothers, 45 fathers, 2 uncles, 1 grandmother, 1 grandfather, and 1 sister with a median age of 29 years (range, 16-53 ys) and a median weight of 68 kg (range, 47-106). Sixteen patients (12.9%) required retransplantation, most commonly due to hepatic artery thrombosis (HAT; n = 13; 10.7%). The other complications were biliary stenosis (n = 25; 20.6%), portal vein thrombosis (PVT; n = 11; 9.1%), portal vein stenosis (n = 5; 4.1%), hepatic vein stenosis (n = 6; 4.9%), and lymphoproliferative disorders (n = 8; 6.6%). The ultimate survival rate of recipients was 90.3% after 1 year and 75.8% after 3 years. Causes of early death within 1 month were HAT (n = 6), PVT (n = 2), severe graft dysfunction (n = 1), sepsis (n = 1), and intraoperative death in children with acute liver failure (n = 2). Causes of late deaths included lymphoproliferative disease (n = 3), chronic rejection (n = 2), biliary complications (n = 3), and recurrent disease (n = 3; hepatoblastoma and primary sclerosing cholangitis). Conclusions. Despite the heightened possibility of complications (mainly vascular), LRDLT represented a good alternative to transplantation from cadaveric donors in pediatric populations. It was associated with a high survival ratio.
  • article 15 Citação(ões) na Scopus
    Rex Shunt for Acute Portal Vein Thrombosis After Pediatric Liver Transplantation in Children With Biliary Atresia
    Background/Purpose. Posttransplantation portal vein thrombosis (PVT) can have severe health consequences, and portal hypertension and other consequences of the long-term privation of portal inflow to the graft may be hazardous, especially in young children. The Rex shunt has been used successfully to treat PVT patients since 1998. In 2007, we started to perform this surgery in patients with idiopathic PVT and late posttransplantation PVT. Herein we have reported our experience with this technique in acute posttransplantation PVT. Methods. Three patients of ages 12, 15, and 18 months underwent cadaveric (n = 1) or living donor (n = 2) orthotopic liver transplantation (OLT). All patients had biliary atresia with portal vein hypoplasia; they developed acute PVT on the first postoperative day. They underwent a mesenteric-portal surgical shunt (Rex shunt) using a left internal jugular vein autograft (n = 2) or cadaveric iliac vein graft (n = 1) on the first postoperative day. Results. The 8-month follow-up has confirmed shunt patency by postoperative Doppler ultrasound. There have been no biliary complications to date. Conclusions. The mesenteric-portal shunt (Rex shunt) using an autograft of the left internal jugular or a cadaveric vein graft should be considered for children with acute PVT after OLT. These children usually have small portal veins; reanastomosis is often unsuccessful. In addition, this technique has the advantage to avoid manipulation of the hepatic hilum and biliary anastomosis. Although this study was based on a limited experience, we concluded that this technique is feasible, with great benefits to and low risks for these patients.
  • article 2 Citação(ões) na Scopus
    Transmission of clear cell tumor in a graft liver from cadaveric donor: Case report
    (2012) BACKES, Ariane N.; TANNURI, Ana Cristina A.; MELLO, Evandro Sobroza de; GIBELLI, Nelson Elias M.; ANDRADE, Wagner de Castro; TANNURI, Uenis
    Neoplasms in children after organ transplantation are related to the type and intensity of immunosuppression and the donorrecipient serostatus, especially in relation to the EpsteinBarr virus. The patient was a two-yr-old female child with biliary atresia who underwent a liver transplantation from a female cadaver donor. Two adults received kidney transplants from the same donor. Nine months after transplantation, one of the adult recipients developed an urothelial tumor in the kidney graft. Imaging tests were repeated monthly in the liver-transplanted child and revealed no abnormalities. However, one yr and two months after the transplantation, the patient developed episodes of fever. At that time, imaging and liver biopsy showed a clear cell tumor of urothelial origin in the graft and the disease was limited to the liver. The patient underwent liver retransplantation, and she is currently free of tumor recurrence. Although rare, the occurrence of tumors in the post-transplant period from cadaver donors, without previously diagnosed tumors, is one of the many problems encountered in the complex world of organ transplantation.
  • article 7 Citação(ões) na Scopus
    Congenital Absence of the Portal Vein: A Complex Disease with Multiple Manifestations and Types of Treatment
    (2011) TANNURI, U.; GALVAO, F.; LEAL, A. J. G.; GIBELLI, N. E.; TANNURI, A. C.
  • article 25 Citação(ões) na Scopus
    Extrahepatic portal vein thrombosis after umbilical catheterization: is it a good choice for Rex shunt?
    (2011) GIBELLI, Nelson Elias Mendes; TANNURI, Ana Cristina Aoun; PINHO-APEZZATO, Maria Lucia; MAKSOUD-FILHO, Joao Gilberto; TANNURI, Uenis
    Background: Extrahepatic portal vein thrombosis (EHPVT) is an important cause of portal hypertension in children. Rex shunt has been used successfully to treat these patients. Methods: We report our experience in 19 infants and children (5 months to 14 years) with HPVT eligible for a mesenteric-portal surgical shunt with left internal jugular vein autograft. Eight children had idiopathic EHPVT, nine had post-umbilical catheterization EHPVT, one had portal vein agenesis, and one had posttransplant EHPVT. Results: It was possible to perform the Rex shunt in all patients except for 8 of 9 cases in the post-umbilical catheterization EHPVT group. A Warren procedure was performed in 4 of those patients and a proximal splenorenal shunt in 1. Current follow-up ranges from 3 to 26 months. Shunt thrombosis occurred in one patient with portal vein agenesis and associated cardiac anomaly. Portal hypertension has significantly improved after surgery. None of our patients have experienced new bleeding episodes until now. Conclusions: The Rex shunt should be considered in the treatment of children with idiopathic EHPVT experiencing repeated gastrointestinal bleeding episodes refractory to endoscopic treatment. Nevertheless, the role of this operation for children with post-umbilical catheterization EHPVT is yet to be clearly evaluated.
  • conferenceObject
    (2013) GIBELLI, Nelson Elias Mendes; ANDRADE, Wagner de Castro; VELHOTE, Manoel Carlos Prieto; AYOUB, Ali Abdul Rahman; SILVA, Marcos Marques da; PINHO-APEZZATO, Maria Lucia de; TANNURI, Ana Cristina Aoun; BARROS, Fabio de; RICARDI, Luis Roberto Schlaich; MOREIRA, Daniel de Albuquerque Rangel; MIYATANI, Helena Thie; PEREIRA, Paulo Renato Alencar; TANNURI, Uenis
    BACKGROUND/PURPOSE: zPost transplant portal vein thrombosis (PVT)can be extremely disastrous, and portal hypertension and other consequences of the long term privation of portal inflow to the graft may be hazardous, especially in the very young children. Since 1998, Rex shunt has been used successfully to treat these patients. In 2007 we started to perform this surgery in patients with idiopathic PVT and late post transplant PVT. We report our experience with this technique in acute post transplant PVT. METHODS: Case report of six patients (age–12–18 months) submitted to cadaveric (1) and living donor (5) liver transplant (LT). All patients had biliary atresia with portal vein hipoplasia and developed acute portal vein thrombosis (PVT) in the first post-operative day. They were submitted to a mesenteric-portal surgical shunt (Rex shunt) with left internal jugular vein autograft (5) and cadaveric iliac vein graft (1) in the first post-operative day. RESULTS: Current follow-up of 12 months. Postoperative Doppler ultrasounds confirmed shunt patency. There were no biliary complications until now. CONCLUSION: The mesenteric-portal shunt (Rex shunt) with left internal jugular vein autograft should be considered in children with acute PVT after liver transplantation. These children usually have small portal veins, and reanastomosis is often unsuccessful. In addition, this technique has the advantage that we do not manipulate the biliary anastomosis and the hepatic hilum, thus avoiding biliary complications. Although this is an initial experience, we conclude that this technique is feasible, with great benefits for these patients and with low risks.