Figure 78-14 Wide-QRS complex tachycardia at a rate of 160/min. A, Precordial lead 5. B, Lead 2. Atrioventricular dissociation is present, evident by the P wave preceding the third QRS complex, thus confirming this abnormality to be ventricular tachycardia. (From Wagner SR IV, Johnson SS, White RD: Intraoperative ventricular tachycardia responsive to adenosine. Anesth Analg 82:1086, 1996.)