Reuters Jonathan Grant and Jirka Taylor Nurses prepare a flu shot vaccine at a clinic in Boston
24, 2018 A bad case of the flu can trigger a short-lived, but substantial, spike in some people's heart attack risk, new research suggests. 75% of these patients were over the age of 65, while 25% had experienced a heart attack once before.
The findings come in the midst of a particularly brutal flu season.
Flu viruses are quick-change artists. The most recent figures put the rate at 31.5 hospitalizations per 100,000 Americans, versus only 13.7 per 100,000 two weeks earlier.
Researchers also looked at other illnesses, including respiratory syncytial virus (RSV, an infection of the lungs and respiratory tract) and respiratory viruses other than the flu or RSV, and found the former to increase the risk of heart attack by 3.5 times, while the latter raised the risk by 2.77 times.
"We found that you're six times more likely to have a heart attack during the week after being diagnosed with influenza, compared to the year before or after the infection", says study author, an epidemiologist and family physician with the Institute for Clinical Evaluative Sciences and Public Health Ontario in Canada.
And for years, the American College of Cardiology (ACC) and other groups have recommended that people with heart disease get an annual flu shot.
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The animation explains why we need a new flu vaccine every year. Bufalino said he doubted those medications play into the link between flu and heart attacks. In addition, the infection causes inflammation in the heart and blood vessels, which if damaged, could lead to clots. When a plaque breaks apart, it can completely block an artery supplying the heart, causing a heart attack.
Sixty nine percent of the 332 people in the study who had a heart attack following a flu diagnosis had not gotten a flu shot, according to the study.
In collaboration with Public Health Ontario (PHO), researchers looked at almost 20,000 adult cases of confirmed influenza infection from 2009 to 2014, and identified 332 patients who were hospitalized for a heart attack within one year of receiving a flu diagnosis.
Based on these records, they identified 332 patients who were admitted to the hospital due to a heart attack a year before and after their flu diagnosis. "But the flu poses the highest risk". "The platelets - the little sticky things in your blood that cause clotting - are activated during the infection, so we know that might be part of what causes the heart attack", Bufalino said.
Nonetheless, Kwong advised that getting immunized for the flu is still a good idea, as it reduces one's chances of having a heart attack by preventing infection. But, Kwong pointed out, "even some protection is better than no protection".
"Address all of the traditional risk factors you have - obesity, high blood pressure, high cholesterol", he said.
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