Inhibition by cinnarizine of the responses of smooth muscle from spontaneously hypertensive and normotensive rats

A comparison was made of the inhibition by cinnarizine, a calcium antagonist, of the contractile responses of aortic, carotid, and iliac arterial strips and vasa deferentia from 15- to 17-week-old spontaneously hypertensive rats (SHR) and their normotensive counterparts, Wistar Kyoto (WKY) rats. KCl-induced responses of the aorta from both strains of rats and carotid arteries from WKY only were more sensitive to inhibition than were responses to norepinephrine. No significant differences were observed in the inhibition of tissue responses from the two strains of rats with the exception of the K⁺-induced responses of carotid arterial strips from SHR which were significantly less sensitive to inhibition when compared with carotid strips from WKY.