Abstract
If cardiac rest is indicated as a therapeutic measure, placing the patient at rest in a warm and humid environment (as for example a non-air-conditioned hospital ward in midsummer) may actually increase rather than decrease cardiac work."<sup>1</sup>This judgment based upon more than two decades of experimental and clinical study by Burch and DePasquale dramatizes the role of hot climate upon the heart. From observations in specially constructed climatic rooms these investigators learned that a hot, humid environment resulted in a marked increase in cardiac output and stroke volume.<sup>1</sup>Cardiac work increased in all subjects. Patients with congestive heart failure had a slower rate of sweating than normal subjects, and this impairment of body heat elimination resulted in still greater cardiac stress. The patient may have been at "bed rest," but the environmental effect upon the heart was as though he were engaged in strenuous exertion. As the
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