Beta 1-selectivity of bisoprolol, a new beta-adrenoceptor antagonist, in anesthetized dogs and guinea pigs - PubMed (original) (raw)

. 1984 Nov-Dec;6(6):1156-60.

• PMID: 6084774

Beta 1-selectivity of bisoprolol, a new beta-adrenoceptor antagonist, in anesthetized dogs and guinea pigs

H J Schliep et al. J Cardiovasc Pharmacol. 1984 Nov-Dec.

Abstract

The beta-adrenoceptor activity of the newly synthesized antagonist bisoprolol [+/-)-1-[4-(2-isopropoxyethoxymethyl)-phenoxy]-3-isopropylamino-2- propranol, hemifumarate), has been compared with the effect of several reference compounds in anesthetized dogs and guinea pigs. In anesthetized, bivagotomized dogs, isoprenaline dose-response relations for increase in heart rate and decrease in diastolic blood pressure were established. Bisoprolol had the largest beta 1/beta 2 ratio, i.e., 147 (102-292). Practolol showed a beta 1/beta 2 ratio greater than 17; betaxolol 6-15; acebutolol, atenolol, and metoprolol 1.1-3.2; mepindolol 0.6-1 and propranolol 0.2. In artificially ventilated guinea pigs, the activity of bisoprolol on histamine-induced increase in tracheal lateral pressure (TLP) and basal heart rate (HR) was tested: using doses taken at TLP (30 mm Hg) and HR (250 beats/min), bisoprolol exhibited the most pronounced ratio TLP/HR of 124 +/- 59, followed by atenolol 33 +/- 23, metoprolol 25 +/- 15, betaxolol 12 +/- 4, propranolol 1 +/- 0.3, and celiprolol 0.23 +/- 0.19. These experiments indicate that bisoprolol possesses a pronounced beta 1-selectivity, which seems to be superior to that of known beta 1-selective antagonists.

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