[Comparative studies between the effects of captopril and nitrendipine on the hemodynamics and angiotensin converting enzyme of pigs with acute hypoxic pulmonary hypertension].

Pulmonary artery pressure (PAP), pulmonary capillary wedge pressure (PCWP), cardiac output (CO), blood pressure (BP) were monitored before and after hypoxia, Captopril and Nitrendipine injected (7 mg/kg and 100 micrograms/kg) in group A(n = 9), and group B(n = 7) respectively results showed that during hypoxia PAP in all the pigs increased significantly (P < 0.05), compared with normoxia, and after captopril and nitrendipine intravenous injection, the PAP dropped significantly (from 3.76 +/- 0.25 to 3.43 +/- 0.1 kPa versus from 4.21 +/- 0.19 to 3.18 +/- 0.17 kPa. ACE in captopril group was significant reduced P < 0.05 (58.4 +/- to 27.0 +/- 3.0 mumol.min-1/L), but in nitrendipine group was not markedly changed (P > 0.05), we found that reducing the degree of PAP and its duration time, lowered the pulmonary vascular resistance (PVR) and right ventricle stroke index (RVSWI), also improved capacity of oxygen delivery. Nitrendipine was better than captopril, maybe it is an useful drug for patients with pulmonary hypertension.