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J Appl Physiol 68: 2649-2655, 1990;
8750-7587/90 $5.00
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Journal of Applied Physiology, Vol 68, Issue 6 2649-2655, Copyright © 1990 by American Physiological Society

ARTICLES

Hypopharyngeal and neck cross-sectional changes monitored by inductive plethysmography

G. Liistro, D. Stanescu, G. Dooms, C. Veriter, G. Aubert-Tulkens and D. Rodenstein
Pulmonary Laboratory, Cliniques Universitaires St-Luc, Brussels, Belgium.

We present a method to assess cross-sectional area (CSA) changes of the extrathoracic airways (EA) by using an inductive plethysmograph (IP) band placed around the upper part of the neck. Measurements of mouth pressure (Pm) (or flow rate, V) and neck CSA changes during respiratory efforts against a high (or infinite) resistance have shown a highly significant relationship between Pm changes (or V changes, respectively), reflecting CSA changes of the EA and CSA changes of the neck. Simultaneous measurements of CSA of the neck (by IP) and of EA (by computerized tomography) during sustained inspiratory and expiratory efforts against a closed airway showed a high correlation between changes in the former and latter structures. Changes in CSA of the neck were larger with positive than negative transmural pressures, in keeping with the known larger compliance of this airway during expiration. We found this method helpful to assess the behavior of the EA during obstructive apnea episodes, hypopneas, and snoring.


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M. J. Morrell and M. S. Badr
Effects of NREM sleep on dynamic within-breath changes in upper airway patency in humans
J Appl Physiol, January 1, 1998; 84(1): 190 - 199.
[Abstract] [Full Text] [PDF]


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