Influence of Temperature and Oxygen Concentrations in Oxygen Tents
- 24 June 1961
- journal article
- research article
- Published by American Medical Association (AMA) in JAMA
- Vol. 176 (12) , 1017-1025
- https://doi.org/10.1001/jama.1961.63040250005013
Abstract
IT HAS BEEN SHOWN that a hot and humid environment increases the cardiac output, work, and power of the right and left ventricles,1the average increase in cardiac output being 57% for 10 subjects exposed to the hot and humid summer weather of New Orleans (92° F., 71% R.H. [relative humidity]) over that for the same subjects in an air-conditioned, comfortable ward (73° F., 59% R.H.). When subjects were exposed to even higher temperatures and relative humidities (111° F., 86% R.H.) in our experimental climatic rooms, the stress on the heart was greater. Under these circumstances patients with congestive heart failure were able to increase their cardiac output, work, and power only slightly.2The increase in cardiac output and work in a man subjected to a hot and humid environment is a normal physiologic response to maintain thermal equilibrium. Patients in congestive heart failure are unable to perform the extraKeywords
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