Melbourne, Feb 24 (IANS): An episode of intense anger could lead to an eight-fold increase in the risk of heart attack. A high level of anxiety also increases the risk by about nine times, says new research.

"The increased risk of heart attack following intense anger or anxiety is most likely the result of increased heart rate and blood pressure, tightening of blood vessels and increased clotting, all associated with triggering of heart attacks", explained Thomas Buckley, senior lecturer at the University of Sydney, Australia.

The study was an investigation of patients suspected of myocardial infarction (MI, heart attack) and admitted for primary angioplasty at the Royal North Shore Hospital in Sydney, Australia, between 2006 and 2012. It involved 687 participants.

Based on the participants' usual frequency of anger, the risk of heart attack was found to be 8.5 times higher in the two hours following an acute episode of anger than during the "usual frequency" patterns of anger.

Anger,as evident over the 48 hours preceding the onset of symptoms, was self-assessed by a questionnaire based on a seven-point scale.

For study purposes, the threshold of acute anger was defined by level five - "very angry, body tense, maybe fists clenched and ready to burst".

However, high levels of anxiety (greater than the 90th percentile on a validated anxiety scale) were associated with a 9.5-fold increased risk of triggering MI in the two hours after the anxiety episode when compared with anxiety levels the previous day.

The researchers advised that propensity to anger or anxiety should be assessed when managing an individual with heart disease or preventing heart disease in others.

"It should be part of helping individuals to take care of themselves," Buckley noted.

The study appeared in the European Heart Journal; Acute Cardiovascular Care.