An implantable cardioverter-defibrillator (ICD) delivers a shock to the heart of a patient once it is triggered. Sometimes the shock delivery is appropriate but sometimes it is not.
Conditions when a shock is appropriate:
(1) ventricular fibrillation
(2) ventricular tachycardia (monomorphic or polymorphic)
(3) torsades de pointes
Conditions when a shock is inappropriate - arrhythmia related
(1) atrial fibrillation
(2) atrial flutter
(3) atrial tachycardia
(4) supraventricular tachycardia
(5) junctional tachycardia
(6) sinus tachycardia
(7) premature ventricular contraction (PVC)
Conditions when a shock is inappropriate - device related
(1) triggering by a T wave
(2) double counting of a QRS complex
(3) lead failure or insulation break
(4) triggering by a diaphragmatic myopotential
(5) electromagnetic interference
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