New findings which are presented on August 28, 2017, at ESC Congress is that the air temperature is the outer trigger for heart attack. This study is 16-year study and the patients who suggested this is about 280, 000.
First author Dr. Moman A. Mohammad who is from the Department of Cardiology at Lund University, Skane University Hospital, Lund, Sweden said “There is seasonal variation in the occurrence of heart attack, with an incidence in summer and peaking in winter. It is unclear whether this is due to colder temperature or behavioral changes.”
This is the 16-year observational study which is done nationwide by Professor David Erlinge from Lund University. And this is the largest study also which inspect the link between heart attack commonness and weather conditions like sunshine duration, air pressure, precipitation, and air temperature.
In this study, the Swedish myocardial infarction registry (SWEDEHEART), is used and the sequential heart attacks treated at a coronary care unit from 1 January 1998 to 31 December 2013 were also taken into account in this study. The researchers took into the account the particular weather conditions during which heart attacks happened. Using the local meteorological data from hundreds of weather stations in the Swedish Meteorological and Hydrological Institute (SMHI).
And during the time period of study, total numbers of heart attacks which occurred was about 280, 873 of which meteorological data were available for 99%. And what is examined by the researchers was that the number of heart attacks per day was more during the colder temperature as compared to warmer. And the results across healthcare region were consistent.
It is said by Dr. Mohammad that: “Our results consistently showed a higher occurrence of heart attacks in sub-zero temperatures. The findings were the same across a large range of patient subgroups and at national as well as regional levels, suggesting that air temperature is a trigger for heart attack.”
The reason is that the body reacts to cold by compressing superficial blood vessels, which lower down the thermal conduction in the skin and ultimately increases arterial blood pressure. And the other responses are trembling and increased heart rate, which blows the metabolic rate and in the result of that body temperature increases.
Dr. Muhammad said: “In the majority of healthy people these mechanisms are well tolerated. But in people with atherosclerotic plaques in their coronary arteries, they may trigger a heart attack.”