Document Detail

Swallowing-induced cardio-respiratory responses in man.
MedLine Citation:
PMID:  19864774     Owner:  NLM     Status:  In-Data-Review    
Swallowing transiently increases heart rate. One of the authors developed pronounced bradycardia while breath holding, particularly after an expiration. The objective, therefore, was to study his cardiac responses during swallowing as pronounced bradycardia developed. When, after a maximum inspiration (supine), the heart rate slowly fell below 50 beats min' well-defined P waves (lead II) disappeared. By swallowing 6 times on command after the P waves disappeared his heart rate increased immediately (68 +/- I beats min-'; n=6). P waves with similar morphology to those pre-swallowing were recorded 0.7 +/- 0.1 s (n=6) after the first swallow. He continued breath holding after swallowing. P waves again disappeared, although at faster heart rates (57 +/- I beats min'; n=6). Furthermore, well-defined P waves were observed after the second disappearance at heart rates within the range 30-40 beats min'. Small amplitude P waves continued to be recorded from lead I with P wave disappearance in lead II, suggesting a pacemaker shift, although not to the av node. Autonomic nerves can shift the dominant pacemaker within the sa node. The present report indicates that increased vagal tone may be rapidly reversed by swallowing.
M A Ballal; P A Sanford
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Saudi journal of gastroenterology : official journal of the Saudi Gastroenterology Association     Volume:  4     ISSN:  1319-3767     ISO Abbreviation:  Saudi J Gastroenterol     Publication Date:  1998 May 
Date Detail:
Created Date:  2009-10-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9516979     Medline TA:  Saudi J Gastroenterol     Country:  Saudi Arabia    
Other Details:
Languages:  eng     Pagination:  81-9     Citation Subset:  -    
Department of Physiology, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
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