Sue Leahy remembers one particular Christmas day vividly. At the time, Leahy, now president of the American Safety and Health Institute in New Paltz, N.Y., was a paramedic on call.
"A man had shoveled snow on Christmas Eve and thought he had pulled a muscle, so he let it alone for the night," she recalls. When the pain failed to subside the following morning, he dialed 911. "He actually apologized for disturbing us on the holiday," she says. But he was right to make the call, she says, "he did not pull a muscle; he had suffered a heart attack."
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A classic heart attack is marked by pain in the chest that may radiate down the left arm, but sometimes it may feel more like a muscle pull, she explains. The pain usually lasts more than a few minutes and can wax and wane in intensity. "The heart is a muscle, and the pain could be from a clogged artery in the heart," she says, but the pain can radiate, making it appear to be a pulled muscle in the back or neck.
"When in doubt, go to the emergency room or call 911 and get it checked out," she says. Leahy's advice is especially prudent in winter months when research has shown heart attacks are more common and more severe. A report in the Dec. 13, 2004, issue of Circulation: Journal of the American Heart Association found that the rate of heart disease-related deaths (as well as deaths from other causes) rose sharply between Dec. 25 and Jan. 7. In fact, the death rate peaked on Christmas Day and New Year's Day.
Exactly why winter is prime time for heart attack is still an evolving story, but many theories exist and possibly overlap.
During the winter months, "there is a change in the ratio of daylight hours to dark hours, which changes the hormonal balance, and the hormones involved, such as cortisol, can lower the threshold for a cardiovascular event," explains Stephen P. Glasser, MD, a professor of preventive medicine at the University of Alabama at Birmingham School of Medicine, in Birmingham, Ala.