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J Appl Physiol 42: 761-766, 1977;
8750-7587/77 $5.00
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Journal of Applied Physiology, Vol 42, Issue 5 761-766, Copyright © 1977 by American Physiological Society

ARTICLES

Mucus clearance: in vivo canine tracheal vs. in vitro bullfrog palate studies

A. Giordano Jr, C. K. Shih, D. S. Holsclaw Jr, M. A. Khan and M. Litt

Tracheal mucociliary clearance was studied by a radioisotope technique in pentothal-anesthetized beagles in the control, atropinized, or dehydrated state. Mucus collected from a tracheal pouch in each dog was used for in vitro bullfrog (Rana cantesbiana) palate clearance studies and compared to the in vivo clearance rates. In all three experimental states, there was a significant correlation between in vivo and in vitro rates, suggesting that tracheal pouch mucus is a good model for investigating the mucociliary flow properties of intact airway mucus. When compared to matched controls, atropine appeared to cause a slowing of the in vivo clearance rate but not of the in vitro rate. Dehydration had no effect on either. The appropriateness of the frog palate method in the study of human respiratory disease (e.g., chronic bronchitis, cystic fibrosis) as well as its potential as an objective method of assessing the effects of various therapeutic modalities in these diseases is discussed.


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