Defibrillator,
implantable cardiac: A device put within the body that is designed to
recognize certain types of abnormal heart rhythms (arrhythmias) and
correct them. Defibrillators continuously monitor the heart rhythm in
order to detect rapid arrhythmias such as Ventricular tachycardia
(rapid regular beating of the ventricles, the bottom chambers of the
heart); and Ventricular fibrillation (rapid irregular beating of the
venticles). These ventricular arrhythmias impair the pumping efficiency
of the heart and greatly raise the risks of fainting (syncope) and
sudden cardiac arrest. They tend to develop in people with coronary
artery disease and heart muscle diseases (cardiomyopathies). They are
life- threatening. A defibrillator can be implanted within the body by
far less invasive techniques than in the past because the devices,
aside from being more technologically advanced, are smaller. (An
implantable defibrillator is about the size of a minicassette). The
defibrillator corrects the heart rhythm by delivering precisely
calibrated and timed electrical shocks, when needed, to restore a normal
heartbeat.
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