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J Appl Physiol 69: 1676-1681, 1990;
8750-7587/90 $5.00
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Journal of Applied Physiology, Vol 69, Issue 5 1676-1681, Copyright © 1990 by American Physiological Society

ARTICLES

Recovery of breathing pattern after 15 min of cerebral ischemia in rabbits

R. Pluta and J. R. Romaniuk
Department of Neuropathology, Polish Academy of Sciences, Warsaw.

The study was undertaken to ascertain the neural control of breathing and vagal reflexes during and after cerebral ischemia. The experiments were performed on anesthetized, paralyzed, and artificially ventilated rabbits. Cerebral ischemia was induced by reversible intrathoracic occlusion of the brachiocephalic trunk and the left subclavian and both internal thoracic arteries for 15 min. The effect of cerebral ischemia on breathing pattern was assessed by monitoring the integrated activities of phrenic and recurrent laryngeal nerves. Ischemia produced enhancement of breathing followed by apnea and gasping. During enhanced breathing as well as during gasping, the inspiratory-inhibiting effect of lung inflation (Breuer-Hering reflex) was abolished. When brain circulation was restored, respiratory activity started with gasps, which later were intermingled with eupneic type of inspirations. During the onset of a eupneic breath, lung inflation produced inspiratory facilitation but never an inhibition. However, after 30 min of recovery from cerebral ischemia, the Breuer-Hering reflex was restored. Results show that precise analysis of vagal reflexes and respiratory pattern during ischemia and resuscitation may be used as an indicator of resumption of autonomic activity in the brain stem.


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