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Vascular reactivity to noradrenaline, potassium chloride, and angiotensin II in the rat perfused mesenteric vasculature preparation, during the development of renal hypertension.

The degree of reactivity to noradrenaline of the perfused mesenteric vasculature and the blood pressure of the renal hypertensive rat were correlated. Early (true) supersensitivity was demonstrated for noradrenaline and angiotensin but not for KCl. Later (apparent) hyperreactivity to all three substances was related to an elevated maximal response. The potentiating actions of endogenous angiotensin could cause the early (true) supersensitivity to noradrenaline.