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PET scans show Transcendental Meditation with cardiac rehabilitation increases blood flow to the heart

Maharishi University of Management

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IMAGE: Cardiac PET scan machine used in the cardiac rehabilitation study with and without TM at Columbia University Irving Medical Center. view more 

Credit: Columbia University Irving Medical Center

Can more be done besides diet and exercise to better recover from a heart attack, a stroke, or to prevent one? Scientists from Columbia University Irving Medical Center and the Institute for Prevention Research conducted a study, with and without meditation, to find out.

A new study published in the Journal of Nuclear Cardiology reported that patients with coronary heart disease who included Transcendental Meditation (TM) with their cardiac rehabilitation regime increased blood flow to the heart by more than 20%.

The pilot study — "Effects of cardiac rehabilitation with and without meditation on myocardial blood flow using quantitative positron emission tomography" — was funded by the National Institutes of Health and conducted at Columbia University Irving Medical Center, in collaboration with the Institute for Prevention Research. The research involved 56 patients who had coronary heart disease, including recent heart attack, coronary artery bypass, or angina.

First study of its kind

The project was a groundbreaking proof-of-concept study, in that it was the first to combine Transcendental Meditation with other lifestyle treatment modalities, and the first to use positron emission tomography (PET) to measure the effect of mind-body lifestyle modificaiton on cardiac function.

"This was the first study to show that the cardiovascular benefits of lifestyle modification such as structured exercise and dietary counseling may be enhanced by adding Transcendental Meditation in patients with heart disease," said Robert Schneider, MD, FACC, co-director of the study and medical director of the Institute for Prevention Research. "It also found that the Transcendental Meditation technique alone was able to reverse the effects of coronary heart disease assessed by PET imaging."

Considered a gold standard for measuring myocardial flow reserve non-invasively, cardiac PET has diagnostic and prognostic significance in coronary heart disease.

Randomized, controlled pilot study

The researchers randomly divided the subjects into four groups: cardiac rehabilitation, Transcendental Meditation, Transcendental Meditation plus cardiac rehabilitation, or usual care.

The results showed that of the 37 patients who completed posttesting, myocardial blood flow increased by 20.7% in the group that did both Transcendental Meditation and cardiac rehabilitation. Blood flow in the group that practiced Transcendental Meditation alone increased 12.8%. Cardiac rehabilitation by itself showed an improvement of 5.8%. And patients who received the usual treatment showed a decrease in blood flow of -10.3%.

Stress reduction therapies in cardiac rehabilitation

"Although this is a preliminary study, it suggests that managing one's mind-body connection with Transcendental Meditation can improve the function of the heart in cardiovascular patients," said Dr. Schneider, who is also dean of Maharishi University of Management's College of Integrative Medicine.

He said that psychosocial stress is known to be a risk factor for coronary heart disease but that stress reduction therapies aren't usually included in cardiac rehabilitation.

"More research needs to be done, but this study and previous research strongly suggest that medical professionals should consider utilizing this simple yet effective mind-body intervention in their heart health treatment and prevention programs," Dr. Schneider said.

Possible mechanism

While it's not known precisely how Transcendental Meditation would increase blood flow, the researchers speculate that it's a result of improved endothelial-mediated coronary and arteriolar vasomotor function. That is, reduced levels of stress hormones and possibly inflammation may result in improved function of the endothelial cells that line the coronary arteries. They cite research, which has found that modifying risk factors for cardiovascular disease improves blood flow in the heart.

Limitations of the study

While the study suggests that the Transcendental Meditation technique can increase blood flow in cardiovascular patients, carefully conducted clinical trials with larger sample sizes are needed to confirm the benefit.

"This was a first pilot study designed to determine the size of the effect and feasibility," Dr. Schneider said. "Of the 56 original subjects, only 37 were available for the final posttesting of blood flow after the 12-week study period. In addition, compliance with cardiac rehabilitation was average, with attendance at exercise sessions about 60%. Also, the subjects practicing Transcendental Meditation may have received more attention than the rehabilitation group. This initial study paves the way for full scale clinical trials that will more rigorously evaluate these effects."

Transcendental Meditation also reduces risk factors for heart disease

Earlier studies have shown that the Transcendental Meditation technique reduces risk factors for cardiovascular disease, such as blood pressure, atherosclerosis, and insulin resistance. A 2012 study found a 48% reduction in heart attack, stroke, and death.

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Effects of cardiac rehabilitation with and without meditation on myocardial blood flow using quantitative positron emission tomography: A pilot study https://doi.org/10.1007/s12350-019-01884-9.

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