TY - JOUR

T1 - Converting Enzyme Inhibition and Autoregulation of Cerebral Blood Flow in Spontaneously Hypertensive and Normotensive Rats

AU - Strandgaard, S

AU - Barry, D I

AU - Paulson, O B

PY - 1984/7

Y1 - 1984/7

N2 - The cerebrovascular effects of the converting enzyme inhibitor captopril were examined after intravenous or intra-cerebroventricular administration in nornotensive and hypertensive rats. Cerebral blood flow (CBF) was measured using the intracarotid 133xenom method in halothane/nitrous oxide anaesthetised animals. Captopril given either way did not influence the absolute value of CBF. The main finding, however, was that following intravenous administration of captopril at a dose af 10 mg/kg, both the lower pressure limit of CBF autoregulation were shifted to lower pressure and the autoregulatory plateau shortened. The lower limit was shifted 20-30 mm Hg, the upper limit 50-60 mm Hg, andthr autoregulatory plateau consequently shortened by 20-30 mm Hg. In contrast to the marked effects of intrvenous captopril, intracerebroventricular captopril was without effect on CBF autoreguletion. The effect of intravenous captopril was thus probably mediatedby converting enzyme in the cerebrovascular endothelium.

AB - The cerebrovascular effects of the converting enzyme inhibitor captopril were examined after intravenous or intra-cerebroventricular administration in nornotensive and hypertensive rats. Cerebral blood flow (CBF) was measured using the intracarotid 133xenom method in halothane/nitrous oxide anaesthetised animals. Captopril given either way did not influence the absolute value of CBF. The main finding, however, was that following intravenous administration of captopril at a dose af 10 mg/kg, both the lower pressure limit of CBF autoregulation were shifted to lower pressure and the autoregulatory plateau shortened. The lower limit was shifted 20-30 mm Hg, the upper limit 50-60 mm Hg, andthr autoregulatory plateau consequently shortened by 20-30 mm Hg. In contrast to the marked effects of intrvenous captopril, intracerebroventricular captopril was without effect on CBF autoreguletion. The effect of intravenous captopril was thus probably mediatedby converting enzyme in the cerebrovascular endothelium.

U2 - 10.1080/00365599.1984.11783712

DO - 10.1080/00365599.1984.11783712

M3 - Journal article

C2 - 27786001

VL - 18

SP - 35

EP - 38

JO - Scandinavian Journal of Urology and Nephrology

JF - Scandinavian Journal of Urology and Nephrology

SN - 0036-5599

IS - sup79

ER -