BEIJING, May 14 (Xinhuanet) -- "Loving your iPod and duly keeping it close to your heart might be bad for your health, especially if you're fitted with a pacemaker," according to a study initiatedby Jay Thaker, a 17-year-old U.S. high school student.

Thakerfinds that iPods can cause cardiac implantable pacemakers to malfunction by interfering with the electromagnetic equipment monitoring the heart.

The study tested the effect of the portable music devices on 100 patients, whose mean age was 77, outfitted with pacemakers. Electrical interference was detected half of the time when the iPod was held just 2 inches from the patient's chest for 5 to 10 seconds.

The study was held at the Thoracic and Cardiovascular Institute at Michigan State University. The results were presented at the Heart Rhythm Society annual meeting in Denver.

Thaker, whose father is an electrophysiologist and whose mother is a rheumatologist, said he asked his dad about a potential interaction between pacemakers and iPods.

"We looked online but didn't see anything. Then, one of his patients asked him if there would be a problem, so (my father) put me in touch with Dr. Krit (Jongnarangsin)," Thaker said in a telephone interview.

Jongnarangsin, a long-time friend of Thaker's father, is the senior author of the study and an assistant professor in the Division of Cardiovascular Medicine at the University of Michigan.

"Most pacemaker patients are not iPod users," Jongnarangsin said. For that reason, he said, it is unclear how often iPods cause misdiagnosis.

Thaker said he is interested in doing a similar study about how implantable cardioverter defibrillators, known as ICDs, are affected by iPods.