Hemodynamic changes in hypertensive patients at rest and during physical exercise before and after acute i.v. administration of bufuralol-HCl or propranolol.

The hemodynamic effects of 20 mg Bufuralol-HCl and of 15 mg Propranolol given to hypertensives i.v. at rest and under physical exercise conditions were examined. It could be shown that Bufuralol-HCl lowered the diastolic BP and PR at rest already in the acute experiment, contrary to Propranolol. Under physical exercise conditions the diastolic BP is lowered, the PR remains unchanged in spite of reduced CO. After exclusion of other possible explanations, Bufuralol-HCl may lower the diastolic BP acutely at least partly by inhibition of cerebral beta-receptors. A faster and better liquor diffusion could be the reason for these results. It can be assumed that the acute BP lowering effect is mediated by the same mechanism as the chronic effect of the other beta-receptor blocking drugs.