Abstract
Respiratory variables were recorded in 29 anaesthetized, chronic rabbits after bilateral vagotomy in the chest. The Hering-Breuer reflex was absent. Their breathing frequency was lowered and they became hypoxaemic compared to prevagotomy values. Movements of the vocal cords remained undisturbed and the laryngeal resistances were similar to those in the group of intact rabbits. Laryngeal palsy after midcervical vagotomy in these rabbits increased the tracheal pressures to lower values than in the group of intact, acutely vagotomized rabbits. This demonstrates the less adducted position of the paralyzed vocal cords due to the sequence of denervation steps and consequent glottal aperture proportional to increased respiratory airflow.
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