<unk>  is a cardiac rhythm of more than 100 beats per minute with a QRS duration of 120 milliseconds or more.  It is critical to differentiate whether the<unk>  is of ventricular origin and is ventricular<unk>  (VT), or if it is of supraventricular origin with aberrant conduction (SVT with aberrancy).  Rapid differentiation between these two causes of<unk>  is absolutely critical because the treatment options are quite different for VT versus SVT with aberrancy.<unk>  should be assumed to be due to ventricular<unk>  even in a hemodynamically stable patient unless proven otherwise, and first line treatment with verapamil should be avoided.
Wide complex tachycardia
Narrow complex tachycardia
Fascicular VT
Supraventricular arrhythmias
Junctional tachycardia
Ventricular escape beat
Second degree AV block
Sinus arrhythmia