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• W2133025090 abstract "Study objective: Electrocardiographic abnormalities are common after transthoracic defibrillation. ECG ST-segment changes are especially problematic after defibrillation and may indicate ischemic or shock-induced cardiac dysfunction after resuscitation. Biphasic defibrillation waveforms, compared with monophasic waveforms, diminish shock-induced cardiac dysfunction in laboratory preparations. This effect has not been validated in human subjects. We therefore evaluated in a prospective, blinded fashion the effect of biphasic and monophasic transthoracic defibrillation on the ECG ST segment in 30 consecutive patients during surgery for the implantation of a cardioverter-defibrillator. Methods: In each patient two low-energy truncated biphasic transthoracic defibrillation shocks (115 and 130 J) were compared with a standard clinical 200 J monophasic damped–sine wave shock. The biphasic shocks and the damped–sine wave shock have been demonstrated to have equal defibrillation efficacy of 97%. Fifteen-second ECG signals recorded across transthoracic defibrillation electrodes were digitized before ventricular fibrillation induction and immediately after each defibrillation attempt. The ST segments 80 msec after the J point were analyzed in a blinded fashion by two reviewers. The ST-segment deflection, QRS-interval duration, QT interval, and heart rate after each therapy were compared with baseline values. Results: ECG ST-segment elevation was significantly greater with the 200-J damped-sine waveform than with either biphasic waveform. The ECG ST-segment levels were –.55±.36 at baseline, –.76±.36 mm after internal shock, –.02–.36 mm after 115-J biphasic shock, .21±.38 mm after 130-J biphasic shock, and 2.09±.37 mm after 200-J damped–sine wave shock (P<.0001). QRS-interval duration, QT interval, and heart rate did not change significantly with any waveform. Conclusion: Transthoracic defibrillation with biphasic waveforms results in less postshock ECG evidence of myocardial dysfunction (injury or ischemia) than standard monophasic damped sine waveforms without compromise of defibrillation efficacy. [Reddy RK, Gleva MJ, Gliner BE, Dolack GL, Kudenchuk PJ, Poole JE, Bardy GH: Biphasic transthoracic defibrillation causes fewer ECG ST-segment changes after shock. Ann Emerg Med August 1997;30:127-134.]" @default.
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• W2133025090 date "1997-08-01" @default.
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• W2133025090 title "Biphasic Transthoracic Defibrillation Causes Fewer ECG ST-Segment Changes After Shock" @default.
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• W2133025090 doi "https://doi.org/10.1016/s0196-0644(97)70130-6" @default.
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