Apnoea and Bradycardia from Submersion in “Chronically” Decerebrated Cats

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Abstract
In chronically but not in acutely decerebrated cats, submersion of the head caused apnea and marked bradycardia, associated with a maintained or slightly raised arterial pressure. Since these reflex adjustments, though very reproducible, occurred with a varying latency and could be induced also by nasal injection of water, they appeared to be, at least in part, elicited from the upper respiratory passages. A terrestrial mammal, reputed to shun any form of immersion, can exhibit adjustments during head submersion, similar to those in habitually diving species. This response pattern is basically organized at the lower brainstem level.