Altered vascular reactivity and baroreflex sensitivity induced by chronic central administration of captopril in the spontaneously hypertensive rat.

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Abstract
Previous studies from our laboratory have shown that chronic intracerebroventricular administration of captopril attenuates the development of hypertension in the spontaneously hypertensive rat of the Okamoto strain (SHR) without altering sodium and water balance, plasma renin, or sympathoadrenal activities. To determine whether the depressor effect of intracerebroventricular captopril was associated with an alteration in peripheral vascular reactivity and/or baroreflex sensitivity, vascular reactivity to phenylephrine and vasopressin was assessed in renal, mesenteric, and hindquarter vascular beds using pulsed Doppler flow probes. Captopril was infused into the jugular vein or lateral ventricle of male SHR and Wistar-Kyoto (WKY) rats for 4 weeks (osmotic mini pump, 1.25 micrograms/0.5 microliter/hr). Control SHR or WKY received intracerebroventricular infusions of vehicle. Four weeks of captopril decreased arterial pressure in both SHR and WKY. In response to phenylephrine and vasopressin, SHR and WKY tr...

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