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J Appl Physiol 67: 954-958, 1989;
8750-7587/89 $5.00
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Journal of Applied Physiology, Vol 67, Issue 3 954-958, Copyright © 1989 by American Physiological Society

ARTICLES

Influence of CPAP on reflex responses to tracheal irritation in anesthetized humans

T. Nishino, K. Sugimori, K. Hiraga and Y. Hond
Department of Anesthesiology, National Cancer Center Hospital, Tokyo, Japan.

We investigated the effects of lung inflation during continuous positive airway pressure breathing (CPAP) on airway defensive reflexes in 10 enflurane-anesthetized spontaneously breathing humans. The airway defensive reflexes were induced by instillation into the trachea of 0.5 ml of distilled water at two different levels of end-expiratory pressure (0 and 10 cmH2O CPAP). The tracheal irritation at an end-expiratory pressure of 0 cmH2O caused a variety of reflex responses including apnea, spasmodic panting, expiration reflex, cough reflex, an increase in heart rate, and an increase in blood pressure. Lung inflation during CPAP of 10 cmH2O did not exert any influence on these reflex responses in terms of the types, latencies, and durations of reflex responses although the intensity of the expiration reflex and cough reflex was augmented by lung inflation. Our results suggest that the pulmonary stretch receptors do not play an important role in the mechanisms of airway defensive reflexes in humans.


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[Abstract] [Full Text] [PDF]


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