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Figure 2 Final three stored tachyarrhythmic events (over a 38-min period) in patient no. 5, showing (A) sustained monomorphic VT terminated by a 550-V shock (*) after failed successive antitachycardia pacing therapies (ATP), occurring at 17:06 h with patient abruptly collapsing and, despite bystander cardiopulmonary resuscitation, found 6 min later by the emergency medical staff to be pulseless; (B) polymorphic VT successfully treated with a single shock after failed ATP, occurring at 17:43 h after unsuccessful advanced resuscitative efforts by the emergency medical staff and subsequently the emergency room staff; and (C) 1 min later, ongoing polymorphic VT, after ineffective ATP, inappropriately redetected as sinus rhythm (SRD). Note the progressive decrease and variability in the amplitude of the electrograms preceding SRD.
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