Document Detail

Cardiac versus coronary dilator effects of SD-3211, a new nondihydropyridine calcium antagonist, in isolated, blood-perfused dog hearts.
MedLine Citation:
PMID:  2081139     Owner:  NLM     Status:  MEDLINE    
Coronary and cardiac effects of SD-3211 were compared in isolated, blood-perfused sinoatrial (SA) node, atrioventricular (AV) node, and papillary muscle preparations of dogs. SD-3211 was administered intraarterially. In all preparations SD-3211 produced an increase in coronary blood flow. In SA node preparations, the drug produced a decrease in sinus rate, and in high doses atrial standstill occurred. The dose that produced a 15% decrease in sinus rate was about 5.6 times the dose that doubled coronary blood flow. In AV node preparations, when injected into the artery supplying the AV node, the drug produced an increase in AV conduction time, and in high doses second- or third-degree AV block occurred. The dose that produced a 15% increase in AV conduction time was about 1.6 times the dose that doubled coronary blood flow. In the same preparations the drug slightly increased AV conduction time only at high doses when injected into the artery supplying the His-Purkinje-ventricular system. In paced papillary muscle preparations, the drug produced a decrease in the force of contraction. The dose that produced a 50% decrease in the force of contraction of the paced papillary muscle was about 50 times the dose that doubled coronary blood flow. The drug was virtually ineffective on ventricular automaticity. In short, in doses that doubled coronary blood flow, SD-3211 depressed only AV nodal conduction. This cardiovascular profile differs from those of diltiazem and verapamil, which do not discriminate between coronary vasculature and the SA and the AV node.
F Yoneyama; H Yamada; K Satoh; N Taira
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Cardiovascular drugs and therapy / sponsored by the International Society of Cardiovascular Pharmacotherapy     Volume:  4     ISSN:  0920-3206     ISO Abbreviation:  Cardiovasc Drugs Ther     Publication Date:  1990 Dec 
Date Detail:
Created Date:  1991-05-08     Completed Date:  1991-05-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8712220     Medline TA:  Cardiovasc Drugs Ther     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1469-76     Citation Subset:  IM    
Department of Pharmacology, Tohoku University School of Medicine, Sendai, Japan.
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MeSH Terms
Calcium Channel Blockers / pharmacology*
Coronary Circulation / drug effects
Coronary Vessels / drug effects*
Dose-Response Relationship, Drug
Heart / drug effects*
Heart Conduction System / drug effects
Injections, Intra-Arterial
Thiazoles / pharmacology*
Reg. No./Substance:
0/Calcium Channel Blockers; 0/Thiazoles; 116476-14-3/sesamodil

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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