Volume 8, Issue 1 (5-1994)                   Med J Islam Repub Iran 1994 | Back to browse issues page

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DEHGHANI G A, BAHAEDINI A. HY POXIA AND I TS INFLUEN CES ON THE CARDIOVASCULAR AND RESPIRATORY SYSTEMS OF SPONTANEOUSLY BREATHING CATS. Med J Islam Repub Iran 1994; 8 (1) :43-46
URL: http://mjiri.iums.ac.ir/article-1-1403-en.html
HY POXIA AND I TS INFLUEN CES ON THE CARDIOVASCULAR AND RESPIRATORY SYSTEMS OF SPONTANEOUSLY BREATHING CATS
GHOLAM A. DEHGHANI , A BAHAEDINI
From the Dept. of Physiology. Shiraz Medical School, Shiraz University of Medical Sciences, Shiraz.lslamic Republic of Iran
Abstract:   (4024 Views)
Effects of acute systemic hypoxia on the cardiovascular system (CYS) and respiration of spontaneously breathing cats were studied in two conditions. 1): Hypoxic air (6-8% 02 in N2) was given to the animal to induce systemic hypoxia for 20 minutes. Hyperventilation at this condition lowered arterial C02 tension (PaC02 hypocapnia). 2): In the second run, induction of hypocapnia was prevented by adding 3-5% C02 to hypoxic air. Comparison of the results of this study indicated that hypoxia, independent of the presence of hypocapnia, caused a significant increase in respiratory rate, aortic flow and arterial blood pressure. However, in the presence of hypocapnia, the increased respiratory rate was 10% less and a general arterial vasconstriction was observed.
Keywords: hypocapnia; arterial chemoreceptors; cardiovascular system.
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Type of Study: Original Research: Basic Science in Medicine | Subject: Physiology
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