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OBJECTIVE: The aim of this study was to assess systemic hemodynamic changes in patients with Manson's schistosomiasis and portal hypertension during azygoportal disconnection and splenectomy. METHODS: Sixteen patients with portal hypertension secondary to hepatosplenic schistosomiasis with indication for surgery were studied prospectively. All underwent invasive hemodynamic monitoring with pulmonary artery catheter. The first systemic hemodynamic assessment was performed preoperatively. In the intraoperative period new hemodynamic data were collected as follows: a) after laparotomy; b) 15-30 min after splenic artery ligature; c) 15-30 min after splenectomy; and d) after ligation of the collateral circulation. RESULTS: The results indicated preoperatively that the patients presented with an increased cardiac index (4.40 ± 0.94 L/min/m²) together with a reduction in the systemic vascular resistance index (1692.25 ± 434.91 dyne.s/ cm5.m²). The stroke index (53.74 ± 10.40 ml/beat/m²) and both left (5.71 ± 1.50 kg.m/m²) and right heart work indexes (1.12 ± 0.74 kg.m/m²) were also elevated. The mean pulmonary artery pressure was increased (17.81 ± 9.00 mm Hg) and the pulmonary vascular resistance index decreased (164.31 ± 138.69 dyne.s/cm5.m²). From the moment that the splenic artery was ligated until the end of the procedure, the cardiac index (3.45 ± 0.90 L/min/m²) was reduced and the systemic vascular resistance index (2059.50 ± 590.05 dyne.s/cm5.m5) increased. The systolic index (44.25 ± 11.01 ml/beat/m²) and the left ventricle work index (4.33 ± 1.29 kg.m/m²) also reduced. The mean pulmonary artery pressure (19.18 ± 9.21 mm Hg) and the right ventricle work index (0.94 ± 0.62 mm Hg) remained elevated after the surgical procedure. CONCLUSIONS: The data allowed us to conclude that... [ABSTRACT FROM AUTHOR]