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【medical-news】无线植入型心脏去颤器
Implantable cardioverter-defibrillators (ICDs) are small devices that detect potentially deadly heart rhythms, stop them with an electric shock, and restore a normal heart rhythm. Although ICDs are generally implanted in older people who have survived a heart attack, another use is in younger people whose seemingly healthy hearts lapse into the fast or erratic rhythms known as ventricular tachycardia and ventricular fibrillation.
Traditional ICDs are connected to the heart via thin wires called leads (pronounced leeds) placed through a large vein and then into the heart. Placing the leads through the vein is one of the trickiest parts of the procedure, and leads sometimes fail.
A California company called Cameron Health has developed a subcutaneous (under the skin) ICD that doesn't use leads. A surgeon implants the pulse generator under the skin below the left armpit and connects it to a flexible rod placed under the skin just to the left of the breastbone. Sensors on the top and bottom of the rod constantly monitor the heart. If they detect a dangerous rhythm, the center of the rod emits a jolt of electricity.
Photo courtesy Cameron Health
The subcutaneous ICD can't pace the heart with steady pulses of electricity, as do many ICDs, so its use is limited. But it could offer an alternative for younger people who will likely live with an ICD for many years and who don't require a pacemaker.
Based on positive results from clinical trials in New Zealand, Germany, and the Netherlands (New England Journal of Medicine, July 1, 2010), the subcutaneous ICD has been approved for use in Europe. The FDA will look at the results of a clinical trial underway in the United States (the S-ICD System IDE Clinical Study) to determine if it should be approved here. 本人已认领该文献编译 48小时如仍未提交 请其他战友自由认领
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作者:admin@医学,生命科学 2010-12-25 02:22
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