Space-age help for the heart
Each year 300,000 people in the U.S. die from cardiac arrest, usually caused by uncontrolled contraction of muscle fibers in the heart's pumping chambers. Known as ventricular fibrillation, these attacks cut off circulation and halt the flow of blood to the brain. Only powerful electrical shocks administered directly to the chest or heart with bulky machines called defibrillators seem to stop such life-threatening episodes. But all too often, victims are stricken at home or in the streets and help does not arrive in time.
Last week a team of...
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