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The effect of elevated temperature on mortality is a public health threat of considerable magnitude. Every year, a large number of hospitalizations and deaths occur in association with exposure to elevated ambient temperatures (1, 2). An average of 400 deaths annually are counted as directly related to heat in the United States, with the highest death rates occurring in persons aged 65 years or more (3). The actual magnitude of heat-related mortality may be notably greater than what has been reported, since we do not have widely accepted criteria for determining heat-related death (4, 5–7), and heat may not be listed on the death certificate as causing or contributing to death. Persons living in urban environments may be at particularly increased risk for mortality from ambient heat exposure, since urban areas typically have higher heat indexes (combinations of temperature and humidity (8)) than surrounding suburban or rural areas, a phenomenon known as the “urban heat island effect” (9). Moreover, urban areas retain heat during the night more efficiently (10). Thus, as the US population becomes more urbanized and the number of elderly people continues to increase (11), the threat of heat-related mortality will probably become more severe. Many of these deaths may be preventable with adequate warning and an appropriate response to heat emergencies, but preventive efforts are complicated by the short time interval that may elapse between high temperature exposure and death. Thus, prevention programs must be based around prospective and rapid identification of high-risk conditions and persons. We carried out this review to assess the current epidemiologic evidence available for this purpose.

Relation between Elevated Ambient Temperature and Mortality: A Review of the Epidemiologic Evidence