Pattern and determinants of hospitalization during heat waves: an ecologic study

Area of Science:

• Environmental Health
• Geriatric Medicine
• Public Health

Background:

• Limited research quantifies heatwave-associated morbidity, focusing instead on mortality.
• This study investigates the link between hospital admissions and heatwave characteristics.

Purpose of the Study:

• To examine the relationship between hospital admissions and heatwave intensity, duration, and timing.
• To identify specific health conditions exacerbated by heatwaves in the elderly population.

Main Methods:

• Analysis of hospital discharge records for individuals aged 75+ in the Veneto Region, Italy (2002-2003).
• Focus on heat diseases (HD), respiratory diseases (RD), circulatory diseases (CD), and femur fractures (FF).
• Generalized Estimating Equations used to analyze daily hospital admissions during five heatwaves.

Main Results:

• Each additional day of heatwave duration increased risk for heat diseases (HD) by 16% and respiratory diseases (RD) by 5%.
• A minimum of four consecutive hot days was needed for significant increases in HD (over twofold) and RD (approx. 50%).
• No correlation found between heatwaves and admissions for circulatory diseases (CD) or femur fractures (FF).

Conclusions:

• Heat health system alerts should prioritize the duration of hot, humid days, as the initial four days have minor effects.
• Adaptation to extreme temperatures in late summer appears limited, suggesting a need for proactive public health interventions.