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Untreated atrial septal defect can lead to pulmonary hypertension, chest infection, Eisenmenger's syndrome, atrial fibrillation, atrial flutter, stroke, or right-sided heart failure.
Defibrillation-A procedure to stop the type of irregular heart beat called ventricular fibrillation, usually by using electric shock.
An ICD is a device used primarily to treat ventricular tachycardia and ventricular fibrillation, two life-threatening heart rhythms.
This includes people who have heart disorders (including congestive heart failure and arterial fibrillation.