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J Appl Physiol 92: 2229-2235, 2002. First published October 19, 2001; doi:10.1152/japplphysiol.00761.2001
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Vol. 92, Issue 6, 2229-2235, June 2002

Mechanical properties of the passive pharynx in Vietnamese pot-bellied pigs. I. Statics

Stephanie A. Tuck and John E. Remmers

Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada T2N 4N1

The static mechanical properties of the passive pharynx were investigated in Vietnamese pot-bellied pigs by using an isolated upper airway preparation. During general anesthesia 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 of displacement) and decreased Pclose of the oropharynx (from -18.2 ± 9.9 cmH2O to -24.1 ± 10.5 and -28.7 ± 12.3 cmH2O with 1 and 2 cm of displacement, respectively). 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.

caudal tracheal displacement; sleep apnea; pharyngeal compliance; closing pressure


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