Document Detail

Atropine and neuromuscular fade in the mouse phrenic nerve-diaphragm.
MedLine Citation:
PMID:  8825542     Owner:  NLM     Status:  MEDLINE    
PURPOSE: These studies were intended to resolve the conflict between the reasonable inference from the scientific literature that atropine might alter neuromuscular fade and the expectation from informal clinical experience that it does not. METHODS: We examined the effect of a high concentration of atropine (20 microM) on moderate neuromuscular block and fade produced by d-tubocurarine (dTC). Isometric twitch tension was measured in the mouse phrenic nerve-diaphragm preparation. In one set of experiments, the phrenic nerve was stimulated with trains of 5 pulses at 10 Hz every second. Block and fade were measured in two groups, control and with atropine (n = 6 each). In another set of experiments, the phrenic nerve was stimulated with standard train-of-four stimulation (TOF, 4 pulses at 2 Hz every 11.5 seconds). Block and fade were measured first in a control period and then in a treatment period with either saline (n = 4) or atropine (n = 4). RESULTS: During 10 Hz train stimulation, atropine had no significant effect on either the block of the first twitch (control: 62 +/- 17; atropine: 75 +/- 4) or fade (control: 55 +/- 12: atropine; 57 +/- 14) produced by dTC. Similarly, atropine did not differ significantly from saline in altering dTC-induced block of first twitch (saline: 92.5 +/- 14; atropine 92.5 +/- 9.6% control) or fade (saline 119 +/- 50; atropine 102 +/- 30% control) during TOF stimulation. CONCLUSIONS: While atropine may alter ACh release under some conditions, its action is not great enough to alter either block or fade.
R J Storella; T S Ackerman
Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Canadian journal of anaesthesia = Journal canadien d'anesthésie     Volume:  43     ISSN:  0832-610X     ISO Abbreviation:  Can J Anaesth     Publication Date:  1996 Feb 
Date Detail:
Created Date:  1996-12-04     Completed Date:  1996-12-04     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8701709     Medline TA:  Can J Anaesth     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  169-71     Citation Subset:  IM    
Department of Anesthesiology, Medical College of Pennsylvania and Hahnemann University, Philadelphia, PA 19102, USA.
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MeSH Terms
Acetylcholine / secretion
Atropine / pharmacology*
Muscarinic Antagonists / pharmacology*
Neuromuscular Junction / drug effects*,  physiology
Grant Support
Reg. No./Substance:
0/Muscarinic Antagonists; 51-55-8/Atropine; 51-84-3/Acetylcholine

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