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Study: Temperature, dew point might affect stroke risk

Friday February 14, 2014
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Stroke hospitalization and death rates might rise and fall with changes in environmental temperature and dew point, according to a study.

“Weather is not something people would typically associate with stroke risk; however, we’ve found weather conditions are among the multiple factors that are associated with stroke hospitalizations,” Judith H. Lichtman, PhD, MPH, study author and an associate professor in epidemiology at the Yale School of Public Health in New Haven, Conn., said in a news release.

As presented at the American Stroke Association’s 2014 international conference in San Diego, researchers identified a nationwide sample of 134,510 people, ages 18 and older, who were admitted to hospitals in 2009-10 for ischemic stroke. They obtained temperature and dew point data during that period.

They found larger daily temperature changes and higher average dew point (indicating higher air moisture) were associated with higher stroke hospitalization rates.

Lower average annual temperatures were associated with stroke hospitalizations and death. With each one-degree increase in average temperature, there was a 0.86% decrease in the odds of stroke hospitalization and a 1.1% decrease in the odds of dying in the hospital after stroke.

Increases in daily temperature fluctuation and average dew point were associated with increased odds of stroke hospitalization, but not with dying in the hospital.

“This study suggests that meteorological factors such as daily fluctuations in temperature and increased humidity may be stressors that increase stroke hospitalizations,” Lichtman said. “People at risk for stroke may want to avoid being exposed to significant temperature changes and high dew point and, as always, be prepared to act quickly if they or someone they know experiences stroke signs and symptoms.

“Future research is needed to better understand the cause and effect of changes in weather conditions, as well as to explore potential mechanisms for this association.”

Stroke risk factors that can be changed, treated or controlled include hypertension, cigarette smoking, diabetes, carotid or other artery disease, peripheral artery disease, atrial fibrillation, other heart disease, sickle cell disease, high blood cholesterol, poor diet, physical inactivity, obesity and excessive alcohol consumption.

Stroke signs and symptoms include facial drooping; arm weakness; speech difficulty; sudden numbness or weakness of the leg, arm or face; sudden confusion or trouble understanding; sudden trouble seeing in one or both eyes; sudden trouble walking; dizziness, loss of balance or coordination; and sudden severe headache with no known cause.


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