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In page Cardiomegaly:

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  • Pacemaker: Coordinates contractions between ventricles. In people at risk of arrhythmias, drug therapy or an implantable cardioverter-defibrillator (ICD).[citation needed]
  • ICDs: Small devices implanted in the chest to monitor heart rhythm and deliver electrical shocks to control abnormal heartbeats. The devices can also work as pacemakers.[citation needed]