Title
Equivalence of the standard monophasic waveform shocks delivered by automated external defibrillators? Equivalence of the standard monophasic waveform shocks delivered by automated external defibrillators?
Author
Faculty/Department
Faculty of Medicine and Health Sciences
Publication type
article
Publication
Limerick ,
Subject
Human medicine
Source (journal)
Resuscitation. - Limerick, 1972, currens
Volume/pages
53(2002) :1 , p. 41-46
ISSN
0300-9572
1873-1570
ISI
000175509200007
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Objective: To study whether two different types of monophasic waveform shocks (i.e. monophasic damped sinusoidal [MDS] and monophasic truncated exponential [MTE] waveform shocks) are of equivalent efficacy. Methods: Retrospective review of defibrillation efficacy and outcome in ventricular fibrillation/ventricular tachycardia (VF/VT) patients treated in the same EMS system with AEDs delivering either MDS waveform shocks (n=40) or MTE waveform shocks (n=40). Results: Defibrillation efficacy of the first shock was 82.5% in the MDS group and 70% in the MTE group (P=0.19). Termination of VF by at least one of the first three shocks was found in 95 and 85% of the patients treated with MDS and MTE waveform shocks, respectively (P=0.22). Restoration of spontaneous circulation occurred in 75% of the MDS group and 30% of the MTE group (P=0.0001). Hospital admission rates were 52.5% in the MDS group and 17.5% in the MTE group (P=0.001). Hospital discharge rates were 17.5% in the MDS group and 7.5% in the MTE group (P=0.18). Conclusions: Our data suggest disparity in efficacy between MDS waveform shocks and MTE waveform shocks. Furthermore, our findings should be taken into consideration when the issue of the control group(s) in future clinical trials on new waveforms is discussed.
E-info
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