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Dog Study Raises Prospect of Biological Pacemaker for Humans
Date:2/27/2013

By Randy Dotinga
HealthDay Reporter

WEDNESDAY, Feb. 27 (HealthDay News) -- If your heart doesn't beat correctly, you can get an electronic pacemaker and live happily ever after -- or at least until it wears out and you need another one.

Now, the results of an animal study add to existing evidence that people may one day have an alternative to living out their days with an electronic device implanted in their chests: gene therapy.

The research, reported recently in the Journal of the American College of Cardiology, is preliminary and was performed only in dogs with heart trouble. It's too early to know if a similar strategy would work in humans, how long it would last and if the costs and side effects would be tolerable.

"It's not something I would expect to be working in the short term," said Matteo Vatta, director of the cardiovascular genetics section at Indiana University, who co-wrote a commentary about the findings. Still, he said, "it's not impossible to think about a biological pacemaker."

So what's wrong with traditional pacemakers, which have been around for decades and now often come with defibrillators to shock the heart into a steady rhythm if necessary? They can cause side effects, Vatta said, and require surgery that can spawn complications.

In the new study, researchers induced heart problems in 24 dogs, implanted electronic pacemakers in them and then injected a gene-carrying virus into their hearts. The researchers found that the hearts of some of the dogs were able to beat properly without needing the pacemakers to kick into gear.

Dr. Steven Pogwizd, a professor of cardiac arrhythmia research at the University of Alabama at Birmingham, said the study's findings show promise.

"Ultimately, the goal of a pacemaker is to replicate the normal electrical activation of the heart as closely as possible, and this approach may have the potential to do so," Pogwizd sai
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