Tuesday, December 12, 2006
This week's article:
Magnets may interfere with pacemakers and ICDs
Dec 08 (HealthCentersOnline) - Certain types of magnets that are becoming increasingly popular in clothing and jewelry may interfere with the function of pacemakers and other implanted cardiac devices, according to new research.
Implanted in the chest, pacemakers and implantable cardiac defibrillators (ICD) are two types of battery-powered devices that monitor and, if necessary, correct an abnormal heart rhythm by sending electrical charges to the heart.
Researchers in Europe recently evaluated several types of magnets to see if they were capable of interfering with pacemakers and ICDs that had been implanted in patients.
The study found that while traditional magnets commonly found in the home and office are not dangerous, other types of magnets can be. Specifically, the research found that powerful magnets made from neodymium-iron-boron (NdFeB) are capable of interfering with cardiac devices implanted in the chest.
NdFeB magnets are becoming increasingly popular in office products, toys, jewelry and some clothing. Because of this, the researchers urge the manufacturers of the magnets to place warning labels on their products.
The study included 70 patients, 41 with pacemakers and 29 with ICDs. Each of the patients was tested with two spherical magnets that were 8 and 10 millimeters in diameter, as well as a necklace made of 45 spherical magnets. In every instance, the magnets interfered with the implanted heart devices of the patients. After the magnets were removed, the devices all resumed their normal function.
"Physicians should caution patients about the risks associated with these magnets. We also recommend that the packaging include information on the potential risks that may be associated with these types of magnets," explained Thomas Wolber, a cardiologist at the University Hospital of Zurich in Switzerland and lead author of the study, in a recent press release.
The results of the study were published in the December 2006 issue of the journal Heart Rhythm.
