Abstract
Acute experiments on normal subjects and patients with chronic congestive heart failure, at rest, revealed that a hot and humid environment produced a considerable increase in cardiac work, cardiac output, and stroke volume in the normal subjects and definite, but less, increase in the patients with congestive heart failure. The increase in cardiac work and output occurred more as a result of a larger stroke volume than greater cardiac rate, in comparison with effects of exercise reported by others. Other cardiovascular and respiratory phenomena were also observed. There is evidence from these results and the cardiac response that a hot and humid environment produced a considerable stress upon the heart and circulation. The possible therapeutic implications in subjects with cardiovascular disease and other illnesses have been discussed.
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