Ventricular tachycardia
From IKE
Ventricular tachycardia is a salvo of three or more consecutive ventricular beats at a rate >= 120 beats per minute (bpm).
A broad QRS complex ventricular tachycardia has a rapid regular ventricular rhythm with a QRS duration >= 120 msec, which is one of the ways it is differentiated from classic supraventricular tachycardia (SVT). When a patient presents with a broad QRS complex, ventricular tachycardia is at the top of the differential list, with bundle branch blocked supraventricular tachycardia next, and then preexcited tachycardias such as Wolf-Parkinson-White syndrome.
Diagnosis
On electrocardiogram, one would expect the P waves follow the QRS complex or otherwise be dissociated from it. The tachycardia should also not be influenced by adenosine or vagal maneuvers, both of which directly impact things supraventricularly.
