Hearts, Mending Broken Hearts - National Geographic Magazine
There are five million cases of heart failure in the United States each year. When a heart fails, its ventricles-or pumping chambers-become too weak to pump blood. In such cases, doctors will often implant a Ventricular Assist Device (VAD) to aid the heart. When both of the heart's ventricles fail, however, a VAD may not be effective. Instead, doct
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