wide complex tachycardia


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wide complex tachycardia

Abbreviation: WCT
An arrhythmia with a sustained rate of more than 100 bpm in which the surface electrocardiogram reveals QRS complexes lasting at least 120 msec. WCT is usually caused by ventricular tachycardia, although it may occasionally result from a supraventricular tachycardia whose conduction through the ventricles produces an abnormally wide QRS complex.
See also: tachycardia
References in periodicals archive ?
* Regular, wide complex tachycardias include monomorphic VT (in 80% of cases), SVT with right BBB (RBBB) or LBBB, preexcited tachycardia over an accessory pathway, and pacemaker tachycardias.
* Irregular, wide complex tachycardias include PMVT, AF or AFL with RBBB or LBBB and pre-excited AF.
If digoxin or verapamil is used in wide complex tachycardias, it should be used with caution because both slow conduction through the AV node but may increase conduction through the AP, causing enhancement of conduction to the ventricles.