(HealthDay News) — The onset of cold weather may increase the risk of ischemic stroke and ST-elevation myocardial infarction (STEMI) for some, according to two studies presented Saturday at the annual European Society of Cardiology Congress, held from August 29 to September 2 in London.

In one study, Tze-Fan Chao, MD, a cardiologist at the Taipei Veterans General Hospital and National Yang-Ming University in Taiwan, and colleagues compared daily temperature records in six regions of Taiwan between 2000–2011 and the incidence of ischemic stroke among 289,559 new-onset atrial fibrillation patients. The analysis revealed stroke risk rose by 10% in spring and nearly 20% in winter, as compared with summertime risk.

A second study led by researchers from the University of Manitoba in Winnipeg, Canada, found that with every 20-degree Fahrenheit drop in temperature, the risk for experiencing STEMI went up by 7%.

“We demonstrated that there is a clear relationship between daily temperature and the risk of STEMI,” study author Shuangbo Liu, MD, an adult cardiology resident at the University of Manitoba, noted in a news release from the European Society of Cardiology.

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