Copyright © 1992 by the European Society of Cardiology.
© 1992 The European Society of Cardiology
Electrophysiological and haemodynamic effects of lidocaine and ajmaline in the management of sustained ventricular tachycardia
Department of Cardiology, University of Bonn Bonn, Germany
Received 15 May 1991; revised 3 January 1992; .
Correspondence: Matthias Manz, MD, Department of Cardiology, University of Bonn, Sigmund-Freud-StraBe 25, D-5300 Bonn 1, Germany
Abstract
The electrophysiological and haemodynamic effects of lidocaine (100mg) and ajmaline (50 mg) were evaluated while attempting to interrupt sustained ventricular tachycardia. The study was performed as a prospective, non-blinded, randomized investigation in 61 patients. Lidocaine terminated ventricular tachycardia in four of 31 patients, ajmaline in 19 of 30 patients (P<0.001). QRS and RR intervals during ventricular tachycardia were prolonged by ajmaline from 164±28 ms to 214±49ms and from 371±86 ms to 479±137 ms (P<0.001), respectively; lidocaine did not influence these parameters. The duration of the return cycles after termination of ventricular tachycardia did not differ between the two groups. Lidocaine did not change cardiac output during ventricular tachycardia whereas cardiac output increased significantly under ajmaline from 3.5±1.21. min–1 to 5.5±1.91. min–1 (P<0.001). It is concluded that anti-arrhythmic agents such as ajmaline, which slow conduction velocity and prolong refractoriness, are more effective than lidocaine in the medical treatment of haemodynamically stable, sustained ventricular tachycardia.
Key Words: Ventricular tachycardia • ajmaline • lidocaine • sustained ventricular tachycardia
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