Magnets help zap hearts back to normal

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It’s one of the most common heart problems, and more than two million Americans have an irregular heartbeat, or atrial fibrillation. If left untreated, it puts people at an increased risk of blood clots and stroke. Doctors are now using a new piece of machinery to help these hearts.


The heart’s two small upper chambers, the atria, quiver instead of beating effectively. Blood isn’t pumped completely out of them, so it may pool and clot. If a piece of a blood clot in the atria leaves the heart and becomes lodged in an artery in the brain, it causes a stroke.

About 15 percent of strokes happen in people with atrial fibrillation. The likelihood of developing atrial fibrillation increases with age. Three to 5 percent of people over 65 have the heart condition.

Doctors often first prescribe beta-blockers, calcium channel blockers and other drugs to try to improve the condition before resorting to surgical options such as installing a pacemaker or catheter ablation.


Catheter Ablation To Treat A-Fib

Catheter ablation is a minimally invasive procedure to treat atrial fibrillation that does not require open heart surgery. Catheters, or thin, flexible tubes, are threaded through the patient’s blood vessels from the groin to the heart. Radiofrequency energy directed from the tube’s tip heats and destroys the tissue causing the bad electrical signals.

The procedure’s risks include creating fluid in the lungs or around the heart, bleeding, clots and stroke. An international study found nearly two-thirds of people with atrial fibrillation experienced no symptoms one year after having a catheter ablation.

Seventeen percent of those in the study treated for the condition with just medications reported being arrhythmia-free in the same period.

Magnets Guide Catheter

Electrophysiologists are now using a new piece of technology in catheter ablations for atrial fibrillation. The Stereotaxis system uses powerful magnets positioned near the patient to guide the catheter to the exact problem spots, instead of guiding the tube by hand.

Software maps a pathway through the patient’s blood vessels and heart to the diseased heart tissue, and the doctor directs the ablation using a joystick and other controls from a control room.

The magnets lead the soft catheter along the pathway by guiding its magnetic tip. It allows the physician to position the catheter in the precise location of the heart’s malfunction. Doctors say it also reduces radiation exposure for the patient and the doctor.

“This technology is able to get into some nooks and corners of the heart, which is harder to do by just hand manipulation,” Kalyanam Shivkumar, M.D., director of the UCLA Cardiac Arrhythmia Center in Los Angeles, Calif., said. “It makes it a lot easier, and it’s hoped this procedure will be a lot more effective by the increased use of such technologies.”

There are studies currently going on to determine if the magnetic approach to catheter ablation is more effective in treating atrial fibrillation compared to the traditional technique.


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