Experimental Physiology
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Quarterly Journal of Experimental Physiology 73.1 pp 87-94
© The Physiological Society 1988
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RETROGRADE OESOPHAGEAL CONTRACTIONS IN THE DOG

L. H. Heywood 1 and A. K. W. Wood 2

1 Department of Veterinary Physiology, University of Sydney, N.S.W. 2006, Australia
2 Department Veterinary Clinical Studies, University of Sydney, N.S.W. 2006, Australia

Retrograde oesophageal contractions were observed by simultaneous radiography and electromyography during naturally occurring post-prandial eructations in six dogs. The contractions progressed cranially at 85 ± 16 cm s-1 (S.E.M., n = 50) displacing, to the mouth, gastric gas which had previously passed into and distended the thoracic part of the oesophagus for 304 ± 22 ms (S.E.M., n = 30). Ninety per cent (n = 100) of retrograde oesophageal contractions were followed immediately by a slower aboral contraction (17·1 ± 0·02 cm s-1; S.E.M., n = 15). This appears to be the first description of naturally occurring retrograde oesophageal contractions in a non-ruminant animal.

Submitted on June 3, 1987
Accepted on July 13, 1987






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