Key result
Hot, humid environments trigger overt heart failure symptoms in ~78% of vulnerable patients.
Why the study?
The effects of hot, dry and hot, humid environments on the cardiovascular system in patients with cardiac failure were not well characterized.
Does exposure to hot environments worsen clinical symptoms and cardiovascular parameters in patients with cardiac failure?
Comparison
Hot, dry (90 F, 41% RH) and hot, humid (90 F, 75% RH) environments vs neutral environment (75 F, 41% RH)
Design
Observational clinical study
Authors
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Hot, humid conditions may precipitate decompensation in heart failure; Level 5 data leave open whether environmental control alters outcomes.
Observational (n=23)
Does exposure to hot environments worsen clinical symptoms and cardiovascular parameters in patients with cardiac failure?
Hot and humid environments impose a significant cardiovascular burden and can precipitate overt congestive heart failure in patients with underlying cardiac failure.
Azam Ansari (1969) conducted an observational in cardiac failure (n=23). Hot environments (hot, dry and hot, humid) vs. Neutral environment (75 F, 41% RH) was evaluated on Clinical evidence of overt congestive heart failure. Exposure to hot, humid environments induced symptoms of overt congestive heart failure in 18 of 23 patients (78.3%), imposing a greater cardiovascular burden than hot, dry conditions.
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