RESUMO
BACKGROUND: Accurate diagnosis of portal vein (PV) stenosis by real-time and color Doppler US (CD-US) after segmental liver transplantation in children can decrease morbidity by avoiding unnecessary biopsy, PV hypertension, thrombosis and loss of the graft. OBJECTIVE: To evaluate CD-US parameters for the prediction of PV stenosis after segmental liver transplantation in children. MATERIALS AND METHODS: We retrospectively reviewed 61 CD-US examinations measuring the diameter at the PV anastomosis, velocities at the anastomosis (PV1) and in the segment proximal to the anastomosis (PV2), and the PV1/PV2 velocity ratio. The study group comprised patients with stenosis confirmed by angiography and the control group comprised patients with a good clinical outcome. RESULTS: PV stenosis was seen in 12 CD-US examinations. The mean PV diameter was smaller in the study group (2.6 mm versus 5.7 mm) and a PV diameter of <3.5 mm was highly predictive of stenosis (sensitivity 100%, specificity 91.8%). CONCLUSION: A PV diameter of <3.5 mm is a highly predictive CD-US parameter for the detection of hemodynamically significant stenosis on angiography.
Assuntos
Hepatopatia Veno-Oclusiva/diagnóstico por imagem , Transplante de Fígado , Veia Porta/diagnóstico por imagem , Complicações Pós-Operatórias/diagnóstico por imagem , Ultrassonografia Doppler em Cores , Adolescente , Anastomose Cirúrgica , Angiografia , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Masculino , Valor Preditivo dos Testes , Curva ROC , Estudos Retrospectivos , Sensibilidade e EspecificidadeRESUMO
BACKGROUND: Accurate diagnosis of hepatic vein (HV) stenosis by real-time and color Doppler US (CD-US) after segmental liver transplantation in children can decrease morbidity because it allows unnecessary biopsy, obstruction or thrombosis and loss of the graft to be avoided. OBJECTIVE: To evaluate CD-US parameters to predict HV stenosis after segmental liver transplantation in children. MATERIALS AND METHODS: Retrospective review of 79 CD-US examinations measuring velocity at the HV anastomosis (HV1) and the main trunk 1-2 cm proximal to the HV/IVC anastomosis (HV2), the HV1/HV2 ratio and the spectral waveform of HV2. The study group comprised patients with stenosis confirmed by angiography. The control group comprised patients with a good clinical outcome. RESULTS: HV stenosis was seen in 12 CD-US examinations. The mean HV1/HV2 ratio was higher in the study group (6.0 versus 4.0). An HV1/HV2 ratio of >4.1 was predictive of HV stenosis (sensitivity 83%, specificity 76%). CONCLUSION: An HV1/HV2 ratio of >4.1 is a highly predictive CD-US parameter for the detection of hemodynamically significant HV stenosis on angiography.