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October 1959

Influence of Tropical Weather on Cardiac Output, Work, and Power of Right and Left Ventricles of Man Resting in Hospital

Author Affiliations

New Orleans

From the Department of Medicine, Tulane University School of Medicine, and Charity Hospital of Louisiana.

AMA Arch Intern Med. 1959;104(4):553-560. doi:10.1001/archinte.1959.00270100039007

It has been noted previously1-4 that a warm and humid environment increases the output of the heart. Cardiac output was measured by the direct Fick method in five volunteer subjects resting in bed in wards of the Charity Hospital during the New Orleans tropical weather of July and August, 1957.3 The cardiac output in all patients was found to be higher (mean about 50%) when they were in a warm and humid ward open to the outside weather than when in an air-conditioned and comfortable one. Because of the importance of these findings it was considered advisable to repeat these studies in five more volunteer patients during the New Orleans tropical weather of August, 1958. This report is concerned with the data obtained during the summers of 1957 and 1958.

Materials and Methods  Five additional adult Negro subjects (Subjects 6 through 10), four of whom had no

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