By Pat Anson, PNN Editor

People recovering from a heart attack who have moderate or severe pain are significantly more likely to die -- even when the pain is not associated with heart disease – according to a large new study that highlights the deadly toll that chronic pain can have on health.

“Pain causes significant loss of function and may lead to disability, all of which contribute to major, global public health issues. Research indicates that pain is linked to higher risk of cardiovascular disease and overall death; however, the impact of pain on death after a heart attack has not yet been examined in large studies,” said lead author Linda Vixner, PhD, an associate professor of medical science at Dalarna University in Sweden.

Vixner and her colleagues analyzed 8.5 years of health data for over 18,300 Swedish adults who had a myocardial infarction (MI) – more commonly known as a heart attack. Their findings, published in the Journal of the American Heart Association, show that pain was common a year after the heart attack, with nearly 45% of participants reporting moderate or extreme pain. About two-thirds of them had persistent or long-term pain.

The effect of pain on mortality was even more pronounced than smoking, a well-known risk factor for cardiovascular disease, cancer and other health problems. Heart attack survivors who reported extreme pain were more than twice as likely to die from any cause during the study period, compared to those who had no pain. Those with moderate pain were 35% more likely to die.

Researchers say the study demonstrates that chronic pain is a major risk factor for health providers to consider when treating a patient recovering from a heart attack.

“Pain severity seems to be an important factor, because mortality among patients with chronic pain is higher than in the general population, especially when chronic pain is severe. In addition, we found that patients with extreme pain were less physically active,” they reported.

“Pain and cardiovascular diseases share many lifestyle‐related risk factors and risk factors related to socioeconomic status, which could be one explanation as to why mortality among patients with pain 1 year after MI was significantly higher than mortality in patients without pain. Pharmaceuticals commonly used in pain treatment (both opioids and nonsteroidal anti‐inflammatory agents) are associated with increased cardiovascular risk, which could also be a part of the explanation.”

Previous studies have found that long-term use of non-steroidal anti-inflammatory drugs (NSAIDs) significantly raises the risk of a heart attack or stroke. The FDA says people with a history of cardiovascular disease are at the greatest risk. But the risk is also present for those who don't have heart problems.

A 2016 Vanderbilt University study found that long-term opioid users are more likely to die from cardiovascular and respiratory problems than they are from accidental overdoses.