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Alterations in resting tone, maximum diameter, and dilator reactivity to acetylcholine (ACH) and sodium nitroprusside (SNP) were assessed in cremaster muscle microvessels of Sprague-Dawley rats receiving angiotensin converting enzyme (ACE) inhibition with captopril for 4 days and in untreated time-control rats. The transilluminated in situ cremaster muscle was superfused with physiologic salt solution (PSS) and viewed via television microscopy; arteriolar diameter was measured using a videomicrometer. Before agonist challenge, resting arteriolar diameter was significantly increased in captopril-treated rats. Although maximum arteriolar diameter (determined during superfusion of the cremaster muscle with Ca2+-free PSS containing 10(-4) mol/L adenosine) was not altered with ACE inhibition, the maximum possible arteriolar dilation was reduced in captopril-treated rats. Captopril administration reduced both ACH- and SNP-induced dilation of cremasteric arterioles compared with responses in control rats, although this was partially a function of the reduced capacity for dilation, primarily to SNP. These observations indicate that short-term ACE inhibition reduces both resting tone and agonist-induced dilator responses of skeletal muscle arterioles.

Short-term angiotensin converting enzyme inhibition reduces basal tone and dilator reactivity in skeletal muscle arterioles*1