Exposure to extremely hot or cold temperatures raises a heart disease patient’s risk of dying, according to a new study.

Combing through four decades worth of global data on heart disease patients, the authors found that such extremes were collectively responsible for about 11.3 additional cardiovascular deaths for every 1,000 such incidents.

Patients with heart failure were more likely than those with other types of heart disease to face negative impacts from very cold and hot days, the authors observed, publishing their findings on Monday in the American Heart Association’s journal Circulation. 

These individuals experienced a 12-percent greater risk of dying on extreme heat days and a 37-percent increased risk of dying on extreme cold days, in comparison to optimal temperature days in a given city, according to the study. ... Read More: The Hill