CHEMORECEPTOR STIMULATION AND HYPOXIC PULMONARY VASOCONSTRICTION IN CONSCIOUS DOGS

被引:40
作者
LEVITZKY, MG
机构
[1] Department of Physiology, Louisiana State University Medical Center, New Orleans
来源
RESPIRATION PHYSIOLOGY | 1979年 / 37卷 / 02期
关键词
Arterial chemoreceptors; Bronchospirometry; Hypoxemia; Pulmonary circulation; Ventilation/perfusion ratio;
D O I
10.1016/0034-5687(79)90067-7
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Dogs with electromagnetic flow probes implanted on their left (Q̇l) and main (Q̇t) pulmonary arteries, catheters in their left atria and external jugular veins, and chronic tracheostomies were trained to accept Carlens dual-lumen endotracheal tubes into their tracheostomies, thus allowing separate ventilation of the two lungs. Swan-Ganz catheters were inserted through the jugular vein catheters. neumotachographs measured air flow to each lung. During bilateral ventilation with room air or O2, Q̇l was about 36% of Q̇t. When the left lung was ventilated with N2 while the right remained on O2, PaO was above 90 mmHg and Q̇l fell to about 25% of Q̇t. When the left lung was ventilated with N2 and the right with room air, PaO fell below 40 mm Hg and Q̇l increased to control levels. This increase in perfusion of the hypoxic lung during systemic hypoxemia was not seen in dogs after surgical deafferentation of the systemic arterial chemoreceptors, indicating that stimulation of the arterial chemoreceptors may interfere with the hypoxic pulmonary vasoconstriction. © 1979.
引用
收藏
页码:151 / 160
页数:10
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