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J Appl Physiol (October 19, 2001). doi:10.1152/japplphysiol.00761.2001
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Articles in PresS, published online ahead of print October 19, 2001
J Appl Physiol, 10.1152/jap.00761.2001
Submitted on July 23, 2001
Accepted on October 15, 2001

Mechanical properties of the passive pharynx in Vietnamese pot-bellied pigs: I statics

Stephanie A Tuck1* and John E Remmers1

1 Medicine, University of Calgary, Calgary, Alberta, Canada

* To whom correspondence should be addressed. E-mail: stuck{at}po-box.mcgill.ca.

The static mechanical properties of the passive pharynx were investigated in Vietnamese pot-bellied pigs using an isolated upper airway preparation. During general anaesthesia and neuromuscular blockade, cross-sectional area (A) of the pharynx was measured while airway pressure (PAW) was held at various pressures in the absence of airflow. The static A-PAW relationship was measured during application of 0, 1, and 2 cm of caudal tracheal displacement. Relative to humans, closing pressures (PCLOSE) of the pig pharynx were very low (-15 to -35 cmH2O). Tracheal displacement significantly decreased compliance of the hypopharynx (from 0.074±0.02 cm2/cmH2O with no displacement to 0.052± 0.01 cm2/cmH2O with 2 cm displacement) and decreased PCLOSE of the oropharynx (from -18.2±9.9 cmH2O to -24.1±10.5 and -28.7±12.3 cmH2O). Tracheal displacement did not affect A of the pharyngeal segments. In conclusion, tracheal displacement decreased collapsibility of the passive pharynx. The pharynx of the pot-bellied pig is structurally more resistant to collapse than the human pharynx.




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