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Apparent wide-complex tachycardia. Generally, it is safe (and recommended) to provide treatment as "wide-complex tachycardia". However, in this patient, his baseline EKG was well known and has wide-complex QRS from acute myocarditis. And, based on 12-lead EKG it was decided that this is SVT with wide-complex QRS. Therefore, synchronized cardioversion was attempted and delivered (1 J/kg dose was used for this patient).
Probably due to wide QRS complexes, the defibrillator had hard time to "sync" the shock and automatically, switched off the sync and delivered the shock. Note: the QRS complexes after the DC cardioversion are paced beats (Epicardial, temporary pacing wire at VVI 100 bpm).
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