{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,4,3]],"date-time":"2022-04-03T10:02:09Z","timestamp":1648980129650},"reference-count":31,"publisher":"American Physiological Society","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Physiology-Heart and Circulatory Physiology"],"published-print":{"date-parts":[[2003,5,1]]},"abstract":"<jats:p> Time-sequential responses to endothelium-dependent and -independent vasodilators and angiotensin-converting enzyme (ACE) inhibitors were studied in the subendocardial arterioles (Endo) of canine renovascular hypertension (HT) compared with subepicardial arterioles (Epi; both &lt;120 \u03bcm) by charge-coupled device intravital microscope. Vascular responses to acetylcholine, papaverine, and cilazaprilat were compared between normotensive (NT) and HT dogs [4 wk and 12 wk of HT (4wHT and 12wHT)]. The acetylcholine-induced vasodilation of Endo in both 4wHT and 12wHT was smaller than that of NT (both P&lt; 0.01 vs. 4wHT and 12wHT), and that of Epi was smaller than that of NT only in 12wHT ( P &lt; 0.05). The papaverine-induced vasodilation of Endo, but not Epi, was impaired only in 12wHT (both P &lt; 0.01 vs. NT and 4wHT). Vasodilation by cilazaprilat remained unchanged at 4wHT and 12wHT in both Epi and Endo. In conclusion, at the early stage, the endothelium-dependent response of Endo was impaired, whereas at the later stage, the endothelium-dependent and -independent responses of Endo and the endothelium-dependent response of Epi were impaired. 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