RT Journal
A1 BURCH GE, DePASQUALE NN, HYMAN A, DeGRAFF AC
T1 INfluence of tropical weather on cardiac output, work, and power of right and left ventricles of man resting in hospital
JF A.M.A. Archives of Internal Medicine
JO A.M.A. Archives of Internal Medicine
YR 1959
FD October 1
VO 104
IS 4
SP 553
OP 560
DO 10.1001/archinte.1959.00270100039007
UL http://dx.doi.org/10.1001/archinte.1959.00270100039007
AB 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