Hemodynamic Changes After Chronic Pindolol Administration in Pregnant Renal Hypertensive Rats

The aim of the present study on pregnant renal hypertensive rats was to investigate the effects on central hemodynamics and uteroplacental blood flow after chronic administration of pindolol, a nonspecific g-adrenergic receptor blocking agent with intrinsic 6-stimu-latory effect.Renal hypertension was induced by partial clamping of both renal arteries four weeks before pregnancy. Pindolol was administered with the food during the entire pregnancy period. Two to four days before expected delivery mean arterial pressure, heart rate, cardiac output, (dye-dilution technique) and utero-placental blood supply (microsphere technique) were determined. The chronic pindolol treatment reduced heart rate by 25 per cent while both mean arterial pressure and cardiac output remained unchanged. However, blood flow to uterus and placentae was reduced by 43 and 64 per cent, respectively, after pindolol treatment.Clinical as well as experimental studies (15, 16) demonstrate a reduced utero-placental blood supply when pregna...