Myocardial infarction or acute myocardial infarction, commonly known as a heart attack, results from the interruption of blood supply to a part of the heart, causing heart cells to die. Symptoms of acute myocardial infarction include sudden chest pain (typically radiating to the left arm or left side of the neck), shortness of breath, nausea, vomiting, palpitations, sweating, and anxiety (often described as a sense of impending doom).
Urban legend warns shoveling snow causes heart attacks, and the legend seems all too accurate, especially for male winterly excavators with a family history of premature cardiovascular disease. However, until recently this warning was based on anecdotal reports.
Two of the most important cardiology associations in the US include snow shoveling on their websites as a high risk physical activity, but all the citation references indicate that this warning was based on one or two incidents.
"We thought that this evidence should not be enough to convince us that snow shoveling is potentially dangerous," says Adrian Baranchuk, a professor in Queen's School of Medicine and a cardiologist at Kingston General Hospital.
Dr. Baranchuk and his team retrospectively reviewed KGH patient records from the two previous winter seasons and discovered that of the 500 patients who came to the hospital with heart problems during this period, 7 per cent (35 patients) had started experiencing symptoms while shoveling snow.
"That is a huge number," says Dr. Baranchuk. "7 per cent of anything in medicine is a significant proportion. Also, if we take into account that we may have missed some patients who did not mention that they were shoveling snow around the time that the episode occurred, that number could easily double."
The team also identified three main factors that put individuals at a high risk when shoveling snow.
Dr. Baranchuk collaborated on this study with Wilma Hopman (Department of Community Health and Epidemiology, KGH Clinical Research Center), William McIntyre, (Queen's medical resident), and Salina Chan and David Schogstad-Stubbs (Queen's medical students).
These findings were recently published in Clinical Research in Cardiology.