Air pollution poses bigger risk of heart attack for those with A, B, or AB blood type

Previous studies have also shown links between small-particulate PM2.5 pollution and heart attacks, admission to the hospital with unstable chest pain, heart failure, and atrial fibrillation.
While various studies have associated air pollution with heart problems, a study has said that a person's blood type may determine whether they have a risk of a heart attack due to pollution or not.
According to the study, people who have A, B, or AB blood types are at an elevated risk of having a heart attack during periods of significant air pollution, compared to those with the O blood type.
The ABO gene – which is present in people who have A, B, and AB blood types – is the only gene that is been validated in large international studies to predict heart attacks among people with coronary disease, researchers said.
"At levels higher than 25 microgrammes per cubic meter of pollution, the increase in risk is linear, while below that level there is little if any difference in risk," said Horne.
Researchers found that people with type O blood also have higher risk of heart attack or unstable chest pain in times of high air pollution.
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