Key result
Synchronized 50 W-sec direct current discharge terminates ventricular tachycardia and restores sinus rhythm.
Why the study?
The unusual effect of direct current shock on ventricular tachycardia associated with acute myocardial infarction has been observed but not well characterized in humans.
Does synchronized direct current discharge restore sinus rhythm in a patient with ventricular tachycardia associated with myocardial infarction?
Case Report (n=1)
Does synchronized direct current discharge restore sinus rhythm in a patient with ventricular tachycardia associated with myocardial infarction?
Answers are grounded in this paper and cite their sources.
This case report documents an unusual reversal of QRS polarity following low-energy DC shock for VT in acute MI, a phenomenon previously seen only in animal models, before a higher energy shock successfully restored sinus rhythm.
A case of acute myocardial infarction and ventricular tachycardia is presented.Low energy synchronized direct current discharge caused a reversal of polarity of the QRS vector with only minor change in its rate.A second larger synchronized discharge of 50 W sec abolished the ventricular tachycardia and restored sinus mechanism.The relation between this observation and a similar phenomenon, previously described only in the experimental animal subjected to coronary ligation, is discussed.
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Kaplinsky et al. (1973) conducted a case report in Acute myocardial infarction and ventricular tachycardia (n=1). Synchronized direct current discharge was evaluated on Reversal of polarity of the QRS vector and restoration of sinus mechanism. A low energy synchronized direct current discharge caused reversal of QRS polarity, while a subsequent 50 W sec discharge successfully abolished ventricular tachycardia and restored sinus rhythm.
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