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1.
Transplantation ; 108(2): 464-472, 2024 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-38259179

RESUMO

BACKGROUND: Children are removed from the liver transplant waitlist because of death or progressive illness. Size mismatch accounts for 30% of organ refusal. This study aimed to demonstrate that 3-dimensional (3D) technology is a feasible and accurate adjunct to organ allocation and living donor selection process. METHODS: This prospective multicenter study included pediatric liver transplant candidates and living donors from January 2020 to February 2023. Patient-specific, 3D-printed liver models were used for anatomic planning, real-time evaluation during organ procurement, and surgical navigation. The primary outcome was to determine model accuracy. The secondary outcome was to determine the impact of outcomes in living donor hepatectomy. Study groups were analyzed using propensity score matching with a retrospective cohort. RESULTS: Twenty-eight recipients were included. The median percentage error was -0.6% for 3D models and had the highest correlation to the actual liver explant (Pearson's R = 0.96, P < 0.001) compared with other volume calculation methods. Patient and graft survival were comparable. From 41 living donors, the median percentage error of the allograft was 12.4%. The donor-matched study group had lower central line utilization (21.4% versus 75%, P = 0.045), shorter length of stay (4 versus 7 d, P = 0.003), and lower mean comprehensive complication index (3 versus 21, P = 0.014). CONCLUSIONS: Three-dimensional volume is highly correlated with actual liver explant volume and may vary across different allografts for living donation. The addition of 3D-printed liver models during the transplant evaluation and organ procurement process is a feasible and safe adjunct to the perioperative decision-making process.


Assuntos
Transplante de Fígado , Modelos Anatômicos , Criança , Humanos , Fígado , Doadores Vivos , Estudos Prospectivos , Estudos Retrospectivos , Impressão Tridimensional
2.
Transplantation ; 107(10): 2087-2097, 2023 10 01.
Artigo em Inglês | MEDLINE | ID: mdl-37750781

RESUMO

BACKGROUND: Over 16 000 children under the age of 15 died worldwide in 2017 because of liver disease. Pediatric liver transplantation (PLT) is currently the standard of care for these patients. The aim of this study is to describe global PLT activity and identify variations between regions. METHODS: A survey was conducted from May 2018 to August 2019 to determine the current state of PLT. Transplant centers were categorized into quintile categories according to the year they performed their first PLT. Countries were classified according to gross national income per capita. RESULTS: One hundred eight programs from 38 countries were included (68% response rate). 10 619 PLTs were performed within the last 5 y. High-income countries performed 4992 (46.4%) PLT, followed by upper-middle- (4704 [44·3%]) and lower-middle (993 [9·4%])-income countries. The most frequently used type of grafts worldwide are living donor grafts. A higher proportion of lower-middle-income countries (68·7%) performed ≥25 living donor liver transplants over the last 5 y compared to high-income countries (36%; P = 0.019). A greater proportion of programs from high-income countries have performed ≥25 whole liver transplants (52.4% versus 6.2%; P = 0.001) and ≥25 split/reduced liver transplants (53.2% versus 6.2%; P < 0.001) compared to lower-middle-income countries. CONCLUSIONS: This study represents, to our knowledge, the most geographically comprehensive report on PLT activity and a first step toward global collaboration and data sharing for the greater good of children with liver disease; it is imperative that these centers share the lead in PLT.


Assuntos
Hepatopatias , Transplante de Fígado , Criança , Humanos , Transplante de Fígado/efeitos adversos , Censos , Doadores Vivos , Morte
3.
BMJ Open ; 13(7): e066343, 2023 07 27.
Artigo em Inglês | MEDLINE | ID: mdl-37500271

RESUMO

INTRODUCTION: Portal vein obstruction (PVO) consists of anastomotic stenosis and thrombosis, which occurs due to a progression of the former. The aim of this large-scale international study is to assess the prevalence, current management practices and efficacy of treatment in patients with PVO. METHODS AND ANALYSIS: The Portal vein Obstruction Revascularisation Therapy After Liver transplantation registry will facilitate an international, retrospective, multicentre, observational study, with 25 centres around the world already actively involved. Paediatric patients (aged <18 years) with a diagnosed PVO between 1 January 2001 and 1 January 2021 after liver transplantation will be eligible for inclusion. The primary endpoints are the prevalence of PVO, primary and secondary patency after PVO intervention and current management practices. Secondary endpoints are patient and graft survival, severe complications of PVO and technical success of revascularisation techniques. ETHICS AND DISSEMINATION: Medical Ethics Review Board of the University Medical Center Groningen has approved the study (METc 2021/072). The results of this study will be disseminated via peer-reviewed publications and scientific presentations at national and international conferences. TRIAL REGISTRATION NUMBER: Netherlands Trial Register (NL9261).


Assuntos
Hepatopatias , Transplante de Fígado , Doenças Vasculares , Humanos , Criança , Transplante de Fígado/efeitos adversos , Veia Porta , Estudos Retrospectivos , Prevalência , Doenças Vasculares/epidemiologia , Doenças Vasculares/etiologia , Doenças Vasculares/cirurgia , Sistema de Registros , Estudos Observacionais como Assunto , Estudos Multicêntricos como Assunto
4.
J Surg Res ; 290: 28-35, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37178557

RESUMO

INTRODUCTION: In July 2017, a policy to increase the use of segmental grafts (SGs) was implemented at our institution. The aim was to compare changes in waitlist activity after implementation of this policy. METHODS: A single-center, retrospective study. Pediatric patients on the liver waiting list between January 2015 and December 2019 were screened. Patients were classified as receiving a liver transplant (LT) before (Period 1) or after (Period 2) policy changes. Primary end points were transplant rates and time to transplant. RESULTS: Sixty five first LT performed on 65 patients were included. Twenty nine LT were performed during Period 1 and 36 during Period 2. More than half (55%) of LT in Period 2 were SG, compared to 10.3% in Period 1 (P < 0.001). Forty nine and 56 pediatric candidates on the waiting list accounted for 38.78 and 24.48 person-years during Period 1 and Period 2, respectively. Transplant rates per 100 person-years on the waiting list increased from 85.09 during Period 1 to 187.87 in Period 2 (Rate ratio: 2.20; P < 0.001). Median time to receive a LT decreased from 229 d in Period 1 to 75 d during Period 2 (P = 0.013). One-year patient survival rates were 96.6% in Period 1 and 95.7% in Period 2. One-year graft survival rates were 89.7% and 88% in Period 1 and Period 2, respectively. CONCLUSIONS: A policy to increase the use of SG was associated with significantly higher transplant rates and lower waiting times. Implementation of this policy can be done successfully with no observed negative impact on patient and graft survival.


Assuntos
Transplante de Fígado , Humanos , Criança , Estudos Retrospectivos , Fígado , Taxa de Sobrevida , Listas de Espera
6.
Transplant Direct ; 9(3): e1453, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-36875941

RESUMO

Venous thromboembolism (VTE) occurs in 0.4% to 15.5% and bleeding occurs in 20% to 35% of patients after liver transplantation (LT). Balancing the risk of bleeding from therapeutic anticoagulation and risk of thrombosis in the postoperative period is challenging. Little evidence exists regarding the best treatment strategy for these patients. We hypothesized that a subset of LT patients who develop postoperative deep vein thromboses (DVTs) could be managed without therapeutic anticoagulation. We implemented a quality improvement (QI) initiative using a standardized Doppler ultrasound-based VTE risk stratification algorithm to guide parsimonious implementation of therapeutic anticoagulation with heparin drip. Methods: In a prospective management QI initiative for DVT management, we compared 87 LT historical patients (control group; January 2016-December 2017) to 182 LT patients (study group; January 2018-March 2021). We analyzed the rates of immediate therapeutic anticoagulation after DVT diagnosis within 14 d of LT, clinically significant bleeding, return to the operating room, readmission, pulmonary embolism, and death within 30 d of LT before and after the QI initiative. Results: Ten patients (11.5%) in the control group and 23 patients (12.6%; P = 0.9) in the study group developed DVTs after LT. Immediate therapeutic anticoagulation was used in 7 of 10 and 5 of 23 patients in the control and study groups, respectively (P = 0.024). The study group had lower odds of receiving immediate therapeutic anticoagulation after VTE (21.7% versus 70%; odds ratio = 0.12; 95% confidence interval, 0.019-0.587; P = 0.013) and a lower rate of postoperative bleeding (8.7% versus 40%; odds ratio = 0.14, 95% confidence interval, 0.02-0.91; P = 0.048). All other outcomes were similar. Conclusions: Implementing a risk-stratified VTE treatment algorithm for immediate post-LT patients appears to be safe and feasible. We observed a decrease in the use of therapeutic anticoagulation and a lower rate of postoperative bleeding without adverse impacts on early outcomes.

7.
Transpl Infect Dis ; 24(6): e13941, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-35989545

RESUMO

INTRODUCTION: Surgical site infections (SSI) are a significant cause of morbidity in liver transplant recipients, and the current data in the pediatric population are limited. The goal of this study was to identify the incidence, classification, risk factors, and outcomes of SSIs among children undergoing liver transplantation (LT). METHODS: A single-center, retrospective descriptive analysis was performed of patients age ≤18 years undergoing LT between September 2007 and April 2017. SSI identified within the first 30 days were analyzed. Primary endpoints included incidence, classification, risk factors, and outcomes associated with SSIs. RESULTS: We included 86 patients, eight patients (9.3%) developed SSIs. Among segmental grafts (SG) recipients, 7/61 (11.4%) developed SSI. Among whole grafts recipients, 1/25 (4%) developed SSI. SSIs were associated with the presence of biliary complications (35% vs. 3%, p < .01; odds ratios 24, 95% CI: 3.41-487.37, p<.01). There were no differences in long term graft or patient survival associated with SSI. Patients who developed SSI were more likely to undergo reoperation (50% vs. 16.7%, p = .045) and had an increased total number of hospital days in the first 60 days post-transplant (30.5 vs. 12.5 days, p = .001). CONCLUSIONS: SSIs after pediatric LT was less frequent than what has been previously reported in literature. SSIs were associated with the presence of biliary complications without an increase in mortality. SG had an increased rate of biliary complications without an association to SSIs but, considering its positive impact on organ shortage barriers, should not be a deterrent to the utilization of SGs.


Assuntos
Sistema Biliar , Transplante de Fígado , Humanos , Criança , Adolescente , Infecção da Ferida Cirúrgica/epidemiologia , Infecção da Ferida Cirúrgica/etiologia , Transplante de Fígado/efeitos adversos , Estudos Retrospectivos , Incidência , Fatores de Risco , Transplantados
8.
Front Surg ; 8: 621525, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33796547

RESUMO

Objective: Historically, bile in the biliary tract has been considered sterile. Most of the series are based on patients with biliary tract diseases or the bile has been obtained with procedures susceptible to contamination. Methods: We evaluated the bile in a heterogeneous cohort of liver donors and recipient patients, with samples obtained in a sterile way, directly from the gallbladder and the common bile duct. Results: We assessed the bile microbiota in six liver donors and in six liver recipients after whole or split liver procedures in adult or pediatric recipients. Bile samples were studied using PCR sequencing of the 16S ribosomal RNA gene amplification (rDNA). Conclusions: We demonstrated that the bile is sterile, thereby ruling this out as a source of contamination following transplant.

9.
J Surg Case Rep ; 2020(9): rjaa370, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-33005326

RESUMO

Liver resection for metastatic cancer has become the standard of care for specific groups of patients, including noncolorectal non-neuroendocrine liver metastases (NCNNELM). Liver metastasis from differentiated thyroid carcinoma is considered rare, with an approximated frequency of 0.5%. We present a case of metastatic papillary thyroid carcinoma (PTC) to the liver and literature review. Herein, we report a 72-year-old male that underwent formal left hepatectomy for 4.4 cm metastatic PTC generating left bile duct obstruction. Two months after, presented with multiple small lesions within the hepatic parenchyma and diffuse ductal dilatation of the right biliary system. Therefore, treated with a percutaneous biliary drain placement without complications. In a patient diagnosed with initial Stage II PTC, undergoing total thyroidectomy 10 years before presenting to the clinic. Bearing over a decade of treatments for local and distal recurrences. We believe approaching strategies for this specific disease should be developed to establish standard management.

10.
Transplant Proc ; 52(10): 2934-2940, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-32768284

RESUMO

BACKGROUND AND AIMS: Among all transplanted abdominal organs, the small intestine is one of the most ischemia sensitive. Appropriate graft selection, procurement, and preservation are crucial for optimum graft and patient survival. We evaluated ischemic damage in human small intestine grafts under different hypothermic preservation conditions (cold static and continuous perfusion) and solutions: histidine-tryptophan-ketoglutarate (HTK) and University of Wisconsin (UW). METHODS: Fourteen small intestinal grafts were procured from deceased donors. HTK and UW were used for the vascular perfusion at the cross clamp, and UW, HTK, or Ringer Lactate were used for the luminal flush at the back table. Therefore, part of the same harvested intestine was stored in cold static storage and in continuous perfusion preservation (with intestinal perfusion unit) simultaneously. Histological samples were collected from the jejunum and ileum at different time points and different preservation conditions. The samples were collected before the initiation of cold storage (T0), after 8 hours of cold static (ST8), or after 8 hours of continuous perfusion preservation (PT8) (n = 161 samples). Blinded histological evaluation was conducted and ischemic damage was determined using the Park/Chiu scale. RESULTS: The ileum had less ischemic damage than the jejunum, regardless of using static or continuous perfusion preservation. There was no significantly ischemic damage difference between intestinal grafts flushed and perfused with UW or HTK. CONCLUSION: The jejunum is more susceptible to ischemic injury than the ileum. UW and HTK are equivalent to preserve intestinal graft. This suggests that selective transplantation of ileum could reduce ischemia-related postoperative complications.


Assuntos
Intestino Delgado/transplante , Soluções para Preservação de Órgãos/farmacologia , Preservação de Órgãos/métodos , Perfusão/métodos , Transplantes/efeitos dos fármacos , Criopreservação/métodos , Humanos , Isquemia/prevenção & controle , Doadores de Tecidos
11.
Int J Surg Case Rep ; 60: 230-233, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31252380

RESUMO

INTRODUCTION: In children with extrahepatic portal vein obstruction or those who develop portal vein thrombosis after liver transplant, the use of Meso-Rex Bypass (MRB) creates a more physiological state by redirecting mesenteric blood flow back into the intrahepatic portal system via a venous conduit. PRESENTATION OF CASE: A 3-year-old female with biliary atresia associated with polysplenia syndrome and a surgical history of Kasai portoenterostomy procedure, and an ABO incompatible whole liver transplant. Within a year after transplant she presented with prehepatic portal hypertension, that was treated with MRB using a deceased donor ABO compatible iliac vein as conduit. Six months later, she was taken to the operating room for bypass revision, during the procedure the MRB showed no flow and no thrombus, and a large splenorenal collateral vein that was causing a portal perfusion steal phenomenon was observed. After dissecting the collateral vein, an 8 cm x8 mm segment of this vessel was used as an autologous conduit to re-do the Rex. DISCUSSION: Failed of MRB can be attributed to portal steal phenomenon, hypercoagulable disorders, bypass contraction or kinking. In this case we believe the culprit to be the former. When there is a history of longstanding portal hypertension, large collaterals develop; thus, intraoperative portal vein flow measurement is critical and ligation of large collaterals during liver transplantation and MRB should be performed to avoid portal steal phenomenon postprocedure. CONCLUSION: Using a collateral vein as an alternative autologous venous conduit is a feasible option that can have durable success.

12.
Am J Transplant ; 19(11): 3114-3123, 2019 11.
Artigo em Inglês | MEDLINE | ID: mdl-31152483

RESUMO

Organ shortage is a barrier to liver transplantation (LT). Split LT (SLT) increases organ utilization, saving 2 recipients. A simulation of Organ Procurement and Transplantation Network/United Network for Organ Sharing data (2007-2017) was performed to identify whole-organ LT grafts (WLT) that met the criteria for being splittable to 2 recipients. Waitlist consequences presented. Deceased donor (DD) livers transplanted as whole organs were evaluated for suitability to split. Of these DD organs, we identified the adolescent and adult recipients of WLT who were suitable for SLT. Pediatric candidates suitable to share the SLT were ascertained from DD match-run lists, and 1342 splittable DD organs were identified; 438 WLT recipients met the criteria for accepting a SLT. Review of the 438 DD match-run lists identified 420 children next on the list suitable for SLT. Three hundred thirty-three children (79%) underwent LT, but had longer wait-times compared to 591 actual pediatric SLT recipients (median 147 days vs 44 days, P  < 0.001). Thirty-three of 420 children died on waitlist after a mean 206 days (standard deviation 317). Sharing organs suitable for splitting increases the number of LT, saving more lives. With careful patient selection, SLT will not be a disadvantage to the adult recipients. With a children-first allocation scheme, SLT will naturally increase the number of allografts because adult organs are too large for small children.


Assuntos
Doença Hepática Terminal/mortalidade , Rejeição de Enxerto/mortalidade , Transplante de Fígado/mortalidade , Transplante de Fígado/estatística & dados numéricos , Seleção de Pacientes , Alocação de Recursos/normas , Doadores de Tecidos/provisão & distribuição , Listas de Espera/mortalidade , Adulto , Criança , Doença Hepática Terminal/cirurgia , Feminino , Seguimentos , Rejeição de Enxerto/etiologia , Sobrevivência de Enxerto , Humanos , Transplante de Fígado/efeitos adversos , Masculino , Prognóstico , Alocação de Recursos/estatística & dados numéricos , Fatores de Risco , Fatores de Tempo , Obtenção de Tecidos e Órgãos/estatística & dados numéricos
13.
J Pediatr Gastroenterol Nutr ; 68(4): 472-479, 2019 04.
Artigo em Inglês | MEDLINE | ID: mdl-30720563

RESUMO

OBJECTIVE: The aim of the study was to investigate the impact of prioritizing infants, children, adolescents, and the sickest adults (Status 1) for deceased donor livers. We compared outcomes under two "SharePeds" allocation schema, which prioritize children and Status 1 adults for national sharing and enhanced access to pediatric donors or all donors younger than 35 years, to outcomes under the allocation plan approved by the Organ Procurement and Transplant Network in December 2017 (Organ Procurement and Transplantation Network [OPTN] 12-2017). METHODS: The 2017 Liver Simulated Allocation Model and Scientific Registry of Transplant Recipients data on all US liver transplant candidates and liver offers 7/2013 to 6/2016 were used to predict waitlist deaths, transplants, and post-transplant deaths under the OPTN 12-2017 and SharePeds schema. RESULTS: Prioritizing national sharing of pediatric donor livers with children (SharePeds 1) would decrease waitlist deaths for infants (<2 years, P = 0.0003) and children (2-11 years, P = 0.001), with no significant change for adults (P = 0.13). Prioritizing national sharing of all younger than 35-year-old deceased donor livers with children and Status 1A adults (SharePeds 2) would decrease waitlist deaths for infants, children, and all Status 1A/B patients (P < 0.0001 for each). SharePeds 1 and 2 would increase the number of liver transplants done in infants, children, and adolescents compared to the OPTN-2017 schema (P < 0.00005 for all age groups). Both SharePeds schema would increase the percentage of pediatric livers transplanted into pediatric recipients. CONCLUSIONS: Waitlist deaths could be significantly decreased, and liver transplants increased, for children and the sickest adults, by prioritizing children for pediatric livers and with broader national sharing of deceased donor livers.


Assuntos
Transplante de Fígado , Modelos Teóricos , Obtenção de Tecidos e Órgãos , Listas de Espera , Adolescente , Criança , Pré-Escolar , Humanos , Estados Unidos
14.
Pediatr Transplant ; 22(4): e13184, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29654655

RESUMO

Development of macrovesicular steatosis post-LT in patients with PFIC-1 is increasingly being observed, with the etiology not fully understood. We highlight successful and effective EBD for reversal of allograft steatosis in 2 patients with PFIC-1 disease and discuss our experience with internal biliary diversion in this patient population.


Assuntos
Colestase Intra-Hepática/cirurgia , Drenagem/métodos , Fígado Gorduroso/terapia , Transplante de Fígado , Complicações Pós-Operatórias/terapia , Aloenxertos , Fígado Gorduroso/etiologia , Feminino , Humanos , Lactente , Masculino , Transplante Homólogo
15.
J Am Coll Surg ; 226(6): 1022-1029, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29655618

RESUMO

BACKGROUND: The common practice of performing concurrent or overlapping operations has been intensely scrutinized by lay media and academic press to investigate its safety and cost-effectiveness. However, there is little information about its use within the pediatric population. Even less is known about parents' expectations about the surgeon's role on the day of operation and how they align with those of pediatric surgeons and surgical trainees, despite the potential for significant discrepancies in expectations to erode trust and damage the physician-family relationship. STUDY DESIGN: A 5-point Likert-style survey was designed to characterize expectations about the degree of involvement by pediatric attending surgeons throughout a surgical case (1 = strongly disagree, 3 = neutral, 5 = strongly agree). The survey was administered to parents of pediatric patients undergoing elective operations during a 3-month interval at a single academic institution. The survey was also administered to surgeons and surgical residents at the same institution. Multivariate multiplicity-adjusted t-tests were used to identify significant differences between responders. RESULTS: One hundred and ten parents and 84 pediatric surgeons and trainees completed the survey. Parents' responses to the survey ranged from 4.15 to 4.89, compared with 2.75 to 4.86 from surgeons. The differences achieved statistical significance (p < 0.05) for 8 of 9 statements. Statistically significant differences were fewer, but still present, between attending surgeons and surgical trainees, as well as between surgeons with and without children. CONCLUSIONS: There is a significant mismatch between parents' expectations and those of pediatric surgeons about the role of the surgeon on the day of operation, with parents consistently expecting more direct involvement by the attending surgeon. These discrepancies can have implications for both parent/patient satisfaction and medical education.


Assuntos
Pais/psicologia , Papel do Médico , Relações Profissional-Família , Cirurgiões/psicologia , Adolescente , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Recém-Nascido , Masculino , Inquéritos e Questionários , Adulto Jovem
16.
Eur J Gastroenterol Hepatol ; 30(6): 668-675, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29462027

RESUMO

BACKGROUND: Portal vein thrombosis (PVT) develops in cirrhotic patients because of stagnation of blood flow. Transjugular intrahepatic portosystemic shunt (TIPS) creates a low-resistance conduit that restores portal venous patency and blood flow. AIM: The effect of PVT on transplant-free survival in cirrhotic patients undergoing TIPS creation was evaluated. PATIENTS AND METHODS: A multicenter, retrospective cohort study of patients who underwent TIPS creation for cirrhotic portal hypertension was carried out. A Cox model with propensity score adjustment was developed to evaluate the effect of PVT on 90-day and 3-year transplant-free survival. A subgroup analysis examining mortality of those with superior and inferior PVT was also carried out. RESULTS: A total of 252 consecutive TIPS creations were assessed, including 65 in patients with PVT. Survival of patients with high Model for End-stage Liver Disease scores (≥18) and PVT was not statistically different compared with patients with low Model for End-stage Liver Disease scores (<18) and no PVT at 90 days (P=0.46) and 3 years (P=0.42). Those with superior PVT had improved 90-day and 3-year survival both compared with patients with a inferior PVT and those without a PVT (P<0.01, all cases). CONCLUSION: The presence of PVT does not impair the prognosis of patients following TIPS creation, particularly in patients with superior portal occlusion.


Assuntos
Hipertensão Portal/cirurgia , Cirrose Hepática/complicações , Veia Porta/cirurgia , Derivação Portossistêmica Transjugular Intra-Hepática , Trombose Venosa/etiologia , Adulto , Idoso , Distribuição de Qui-Quadrado , Bases de Dados Factuais , Feminino , Humanos , Hipertensão Portal/etiologia , Hipertensão Portal/mortalidade , Hipertensão Portal/fisiopatologia , Cirrose Hepática/mortalidade , Cirrose Hepática/fisiopatologia , Transplante de Fígado , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Flebografia , Veia Porta/fisiopatologia , Derivação Portossistêmica Transjugular Intra-Hepática/efeitos adversos , Derivação Portossistêmica Transjugular Intra-Hepática/mortalidade , Pontuação de Propensão , Modelos de Riscos Proporcionais , Estudos Retrospectivos , Fatores de Risco , Fatores de Tempo , Resultado do Tratamento , Estados Unidos , Trombose Venosa/mortalidade , Trombose Venosa/fisiopatologia
17.
Regen Med ; 12(8): 929-938, 2017 12.
Artigo em Inglês | MEDLINE | ID: mdl-29215317

RESUMO

AIM: Surgical management of pediatric extrahepatic portal vein obstruction requires meso-Rex bypass using autologous or synthetic grafts. Tissue-engineered vascular grafts (TEVGs) provide an alternative, but no validated animal models using portal TEVGs exist. Herein, we preclinically assess TEVGs as portal vein bypass grafts. MATERIALS & METHODS: TEVGs were implanted as portal vein interposition conduits in SCID-beige mice, monitored by ultrasound and micro-computed tomography, and histologically assessed postmortem at 12 months. RESULTS: TEVGs remained patent for 12 months. Histologic analysis demonstrated formation of neovessels that resembled native portal veins, with similar content of smooth muscle cells, collagen type III and elastin. CONCLUSION: TEVGs are feasible portal vein conduits in a murine model. Further preclinical evaluation of TEVGs may facilitate pediatric clinical translation.


Assuntos
Prótese Vascular , Modelos Animais , Veia Porta/citologia , Veia Porta/transplante , Engenharia Tecidual/métodos , Animais , Feminino , Camundongos , Camundongos SCID , Tecidos Suporte , Microtomografia por Raio-X
18.
J Am Coll Surg ; 224(6): 1066-1073, 2017 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-28017811

RESUMO

BACKGROUND: Intestinal ischemia is observed in conditions such as mesenteric ischemia, or during traumatic events such as intestinal transplantation. Intestinal ischemia leads to pathophysiologic disruptions that present as increased fluid secretion into the intestinal lumen. We propose a novel method to detect real-time ischemic injury that is used in an in vitro model applicable to intestinal transplantation. STUDY DESIGN: Small intestine segments from rats were procured. The segments were attached to customized perfusion chambers. Both intestines were perfused on the vascular side with a Ringer buffer solution. The experimental buffer solution was bubbled with 100% nitrogen to mimic ischemia. Both lumens were perfused with 3 mL HEPES-Ringer solution containing 50 µM fluorescein isothiocyanate (FITC)-inulin. Intraluminal samples were collected at 15-minute intervals to measure FITC-inulin concentration using a nanofluorospectrophotometer. Intestinal tissue samples were processed and evaluated by a blinded pathologist using the Park/Chiu scoring system for grading intestinal ischemia. RESULTS: Samples collected from the ischemic intestine showed a significant decrease in FITC-inulin fluorescence compared with the control intestine, indicating enhanced fluid secretion. Histopathologic samples from the experimental arm exhibited higher scores of ischemic injury in comparison with the control arm, confirming the FITC-inulin as a correlation to ischemia. CONCLUSIONS: Fluorescein isothiocyanate-inulin can be used as a real-time volume marker to monitor the ischemic state of intestinal tissue. A positive correlation between the degree of fluid shift and presence of ischemic injury. The changes in fluorescence signal provide a potential selective method to measure real-time fluid changes inside an intestinal graft to evaluate viability.


Assuntos
Fluoresceína-5-Isotiocianato/análogos & derivados , Intestinos/irrigação sanguínea , Intestinos/diagnóstico por imagem , Inulina/análogos & derivados , Isquemia/diagnóstico por imagem , Animais , Masculino , Ratos , Ratos Sprague-Dawley
19.
J Surg Res ; 207: 223-228, 2017 01.
Artigo em Inglês | MEDLINE | ID: mdl-27979481

RESUMO

BACKGROUND: Delirium is increasingly recognized as a common and important postoperative complication that significantly hinders surgical recovery. However, there is a paucity of data examining the incidence and impact of delirium after liver transplantation. METHODS: Retrospective case series in a tertiary care center examining all (n = 144) adult patients who underwent liver transplantation during a 6-y period. RESULTS: Delirium occurred in 25% of the patients with an average duration of 4.56 d. Patients who developed delirium were older (P = 0.007), had higher preoperative model for end-stage liver disease score (P = 0.019) and longer pretransplant hospital length of stay (LOS; P = 0.003). Patients with delirium were also more likely to have alcohol ingestion as an etiology of the liver failure (P = 0.033). Delirious patients had a trend toward increased ventilator days (P = 0.235) and significantly longer postoperative hospital (P = 0.001) and intensive care unit LOS (P = 0.001). Delirium was also associated with an increased frequency of hospital acquired infections including urinary tract infections (P = 0.005) and pneumonias (P = 0.001). CONCLUSIONS: Delirium is a common occurrence among liver transplant patients associated with increased complications and LOSs. Further prospective studies are needed to determine the specific risk factors in this complex population and to determine if delirium has an impact on long-term outcomes.


Assuntos
Delírio/etiologia , Unidades de Terapia Intensiva/estatística & dados numéricos , Tempo de Internação/estatística & dados numéricos , Transplante de Fígado , Complicações Pós-Operatórias , Adulto , Idoso , Delírio/diagnóstico , Delírio/epidemiologia , Delírio/terapia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Avaliação de Resultados em Cuidados de Saúde , Complicações Pós-Operatórias/diagnóstico , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/terapia , Prevalência , Estudos Retrospectivos
20.
World J Hepatol ; 9(36): 1361-1366, 2017 Dec 28.
Artigo em Inglês | MEDLINE | ID: mdl-29359020

RESUMO

De-novo malignancies carry an incidence ranging between 3%-26% after transplant and account for the second highest cause of post-transplant mortality behind cardiovascular disease. While the majority of de-novo malignancies after transplant usually consist of skin cancers, there has been an increasing rate of solid tumor cancers over the last 15 years. Although, recurrence of hepatocellular carcinoma (HCC) is well understood among patients transplanted for HCC, there are increasing reports of de-novo HCC in those transplanted for a non-HCC indication. The proposed pathophysiology for these cases has been mainly connected to the presence of advanced graft fibrosis or cirrhosis and always associated with the presence of hepatitis B or C virus. We report the first known case of de-novo HCC in a recipient, 14 years after a pediatric living related donor liver transplantation for end-stage liver disease due to biliary atresia without the presence of hepatitis B or C virus before and after transplant. We present this case report to increase the awareness of this phenomenon and address on the utility for screening and surveillance of hepatocellular carcinoma among these individuals. One recommendation is to use similar guidelines for screening, diagnosis, and treatment for HCC as those used for primary HCC in the pre-transplant patient, focusing on those recipients who have advanced fibrosis in the allograft, regardless of etiology.

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