Reflex Respiratory Stimulation by Chest Compression in the Dog

Abstract

Ventilatory stimulation by chest compression was induced by negative pulmonary pressure breathing in dogs under deep Na pentobarbital anesthesia. Bilateral and frequently right vagus black alone abolished this reflex. The degree and pattern of the respiratory response following chest compression by negative pressure depends on the level of anesthesia and the applied pressure. During complete respiratory arrest, while breathing O2, ventilation may be induced at any time by this method. The lung volume displacement for a given negative pressure was greater the deeper the anesthesia, Vagtomy, at any stage of anesthesia, likewise produced a larger volume to pressure ratio upon appln. of pressure indicating the importance of the vagus for the Malntenance of chest tone. The appln. of chest compression in resuscitation is discussed.