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The effect of angiotensin converting enzyme inhibition with captopril (10 mg/kg i.v.) on CBF autoregulation was studied in 16 spontaneously hypertensive rats (8 control and 8 treated with captopril) subjected to acute cervical sympathectomy. CBF was measured repetitively by the intra-arterial  133 Xe injection method, during the manipulation of MABP by norepinephrine or hemorrhagic hypotension. Prior to the administration of drugs, baseline MABP was 112 ± 10 mm Hg in the control group and 119 ± 11 mm Hg in the captopril group. Baseline CBF was 99 ± 19 ml/100 g/min, with no difference in the two groups. In agreement with previous findings in rats with intact sympathetic nerves, the lower limit of CBF autoregulation was reduced from the MABP interval of 70–89 to 50–69 mm Hg by captopril.

journal of cerebral blood flow and metabolism

Acute Sympathetic Denervation Does Not Eliminate the Effect of Angiotensin Converting Enzyme Inhibition on CBF Autoregulation in Spontaneously Hypertensive Rats