Pharmacological profile of a new beta-adrenoceptor blocker, 4-[3-(tert-butylamino)-2-hydroxypropoxy]-N-methylisocarbostyril hydrochloride (N-696).
To characterize the pharmacological profile of a new beta-adrenoceptor blocker, 4-[3-(tert-butylamino)-2-hydroxypropoxy]-N-methylisocarbostyril hydrochloride (N-696), experiments were performed in the isolated atria and trachea of the guinea pig, in the pithed rat, in the anesthetized rabbit, in anesthetized dogs and in anesthetized open-chest dogs. Antiarrhythmic action was assessed in conscious as well as in anesthetized dogs. Although N-696 was a non-selective beta-blocker 15-20 times less potent than propranolol under in vitro conditions, it was as effective a blocker as propranolol under in vivo conditions. N-696 produced a fall of the blood pressure in the pithed rat and attenuated the blood pressure rise produced by stimulation of the preganglionic sympathetic nerve. In the anesthetized rabbits, it produced a hypotensive effect associated with an increased discharge of the renal nerve. In anesthetized dogs it produced a hypotensive effect and a decrease in the myocardial blood flow. However, the decrease in the myocardial blood flow was smaller than that produced by propranolol. All these findings indicate that N-696 has a direct vasodilatory effect besides its beta-blocking action. As a beta-blocker N-696 was unique in that it produced a potent antiarrhythmic effect in two-stage coronary ligation arrhythmia.
D000317:Adrenergic alpha-Antagonists; D000319:Adrenergic beta-Antagonists / Q000494:pharmacology*; D000818:Animals; D000889:Anti-Arrhythmia Agents; D001794:Blood Pressure / Q000187:drug effects; D003326:Coronary Circulation / Q000187:drug effects; D004285:Dogs; D005260:Female; D006168:Guinea Pigs; D006439:Hemodynamics / Q000187:drug effects; D066298:In Vitro Techniques; D007546:Isoquinolines / Q000494:pharmacology*; D007668:Kidney / Q000294:innervation; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009638:Norepinephrine / Q000494:pharmacology; D011817:Rabbits; D051381:Rats; D011919:Rats, Inbred Strains; D013564:Sympathetic Nervous System / Q000187:drug effects
D000317:Adrenergic alpha-Antagonists; D000319:Adrenergic beta-Antagonists; D000889:Anti-Arrhythmia Agents; D007546:Isoquinolines; C036593:tilisolol; D009638:Norepinephrine