Document Detail

Interruption of sympathetic and vagal-mediated afferent responses by transmural myocardial infarction.
MedLine Citation:
PMID:  4017213     Owner:  NLM     Status:  MEDLINE    
We have demonstrated previously that sympathetic and vagal afferents travel in an apical-to-basal course in the heart, and can be stimulated selectively with epicardial applications of bradykinin and nicotine, respectively. In this study we tested the hypothesis that transmural myocardial infarction interrupts sympathetic and vagal afferent fibers traveling through the infarction and produces regions of afferent denervation in areas apical to the infarction. In open-chest, chloralose-anesthetized dogs, transmural myocardial infarction was created by embolizing a diagonal branch of the left anterior descending coronary artery with a vinyl latex solution that was injected directly into the artery and hardened rapidly. The transmural nature of the infarction was verified by the nitro blue tetrazolium staining technique for dehydrogenase enzymes. Epicardial applications of bradykinin (5 micrograms) and nicotine (50 micrograms) were used to stimulate chemically sensitive sympathetic and vagal afferent nerve endings, respectively. Twenty-nine dogs were studied before and 90 min after creation of transmural myocardial infarction. In 20 dogs, epicardial bradykinin applied before production of transmural myocardial infarction produced a maximal pressor response of 13 +/- 3 mm Hg 40 sec after application (p less than .01 vs preapplication values), while topical nicotine produced a maximal depressor response of 14 +/- 2 mm Hg (p less than .01 vs preapplication values) 20 sec after application at all sites tested. Ninety minutes after production of transmural myocardial infarction, epicardial sites basal to the infarction continued to respond normally to both drugs, while sites within the area of infarction and apical to the area (noninfarcted myocardium) no longer showed a pressor response to topical bradykinin or a depressor response to topical nicotine.(ABSTRACT TRUNCATED AT 250 WORDS)
M J Barber; T M Mueller; B G Davies; R M Gill; D P Zipes
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Circulation     Volume:  72     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1985 Sep 
Date Detail:
Created Date:  1985-09-26     Completed Date:  1985-09-26     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  623-31     Citation Subset:  AIM; IM    
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MeSH Terms
Afferent Pathways / physiology*
Blood Pressure / drug effects
Bradykinin / pharmacology
Heart Rate / drug effects
Heart Ventricles / drug effects,  innervation
Myocardial Infarction / physiopathology*
Neural Pathways / drug effects
Nicotine / pharmacology
Sympathetic Nervous System / physiology*
Vagus Nerve / physiology*
Grant Support
Reg. No./Substance:
54-11-5/Nicotine; 58-82-2/Bradykinin

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

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