The cardiovascular effects of ICI 118,587: A beta 1-adrenoceptor partial agonist.
1 In a preparation in which cardiovascular reflexes were prevented from occurring, ICI 118,587 (1-(p-hydroxyphenoxy)-3-beta-(morpholinocarbonamido) ethylamino-2-propranol fumarate) caused dose-dependent positive chronotropic and inotropic effects upon the dog heart. 2 The increase in heart rate brought about by ICI 118,587 was about 43% of the maximum increase produced by isoprenaline. 3 For a given chronotropic effect produced by either ICI 118,587 or isoprenaline, each compound produced a similar inotropic effect as indicated by an increase in LV dp/dtmax. 4 In contrast to the direct stimulant action of ICI 118,587 on the heart no direct effects on vascular smooth muscle were observed. 5 ICI 118,587 was shown to be a competitive antagonist of the chronotropic and vasodilator effects of isoprenaline on the heart and blood vessels and of the chronotropic effects of noradrenaline on the heart. 6 It is concluded that ICI 118,587 is a selective beta 1-adrenoceptor partial agonist.
D000318:Adrenergic beta-Agonists / Q000494:pharmacology*; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D004285:Dogs; D004558:Electric Stimulation; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects*; D006614:Hindlimb / Q000098:blood supply; D066298:In Vitro Techniques; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects; D011412:Propanolamines / Q000494:pharmacology*; D012039:Regional Blood Flow / Q000187:drug effects; D013564:Sympathetic Nervous System / Q000502:physiology; D017307:Xamoterol
D000318:Adrenergic beta-Agonists; D011412:Propanolamines; D017307:Xamoterol