Can Cold Weather Cause More Heart Attacks?
The weather is not typically at the top of the list when we think of the causes of heart attacks. To be sure, lack of exercise and poor dietary choices are the primary causes behind this deadly condition. However, patients must understand what they’re feeling during cold weather and whether it is a warning sign of cardiovascular disease or an impending heart attack.
Here in Nevada, temperatures can get pretty cold, and regardless of what we wear, our bodies try to compensate for even small temperature changes. The body does so in the cold by constricting blood vessels to retain more heat in the core. This is why your skin turns white and blue if exposed to very cold conditions. Remember that your vascular system requires body heat to work correctly, so by reducing blood flow to less important peripheral structures, our body can keep us alive longer, for example, in an emergency. Of course, when a blood vessel constricts, less blood circulates. This is rarely a concern in an adult with a healthy cardiovascular system, as even reduced blood flow still provides enough oxygen throughout the body.
However, someone with heart disease, particularly atherosclerosis, a condition in which the arteries are narrowed by plaque along their walls, can feel significant effects associated with this normal constriction of blood vessels, not least of which is angina or chest pain. Cold weather can also cause:
- Increased heart rate
- Increased blood pressure
- Increased viscosity of the blood
All of which can increase the likelihood of heart trouble.
As we’ve said before, the goal of this vessel constriction is to preserve the function of the heart and brain. Therefore, the coronary arteries are not as constricted as the peripheral arteries. Further, the coronary arteries are substantially wider to accommodate the blood flow needs of the heart. However, significantly occluded coronary arteries can lead to pain and a heightened risk of a heart attack. Studies¹ have shown that adults have a higher chance of heart attack in the coldest weather versus the warm summer months.
Other Clues
Patients can get other clues about their arterial health from how their body reacts in cold weather. The peripheral arteries, those that go to the legs and arms, are smaller than the coronary arteries, and those, too, can begin to narrow due to plaque buildup. Therefore, if you are experiencing pain in your extremities during cold weather, and your feet or hands seem to have much-reduced circulation, turning white or even blue very quickly, you should see a cardiovascular specialist both for the potential diagnosis of peripheral artery disease and to get screened for coronary artery disease and atherosclerosis.
Remember that our bodies are finely tuned machines; even small changes can make a significant difference. Keeping an eye on the signs associated with heart disease can help you get an earlier diagnosis that often results in a more effective treatment plan. At the same time, brushing off cardiovascular-related aches and pains may be tempting, but some can be significant harbingers of larger concerns in the future.
If you are experiencing any extremity or chest pain during these cold winter months, we encourage you to schedule an appointment with one of our cardiologists. If this pain is significant, or you believe you are having an emergency like a heart attack, do not delay calling 911 or going to your nearest emergency room.
Reference:
- M.A. Mohammad, S. Koul, R. Rylance, O. Frobert, J.G. Alfredsson, T. Jernberg, J. Muller, D. Erlinge, 2949
Air temperature as an external trigger of ST-segment elevation myocardial infarction – a SWEDEHEART nationwide observational study, European Heart Journal, Volume 38, Issue suppl_1, August 2017, ehx504.2949, https://doi.org/10.1093/eurheartj/ehx504.2949