The other morphology has an R larger than the R' in lead V1 indicating a ventricular origin. Note the pause, one sinus beat, then the resumption of the bidirectional ventricular tachycardia.

A 12-lead electrocardiogram ... myocarditis — which can also cause left ventricular systolic impairment, hypotension, and nonsustained ventricular tachycardia — or an acute necrotizing ...

The rhythm is either ventricular tachycardia or supraventricular tachycardia ... This is not obvious on the 12-lead ECG tracing, although the heart rate during the tachycardia is almost exactly ...

As noted above, the precordial leads are unreliable, compromising by their inclusion calculations deriving from the set of 12 ECG leads. It appears, therefore, that using sums of data from the six ...

CV evaluation included history, PE, 12-lead and exercise ECG ... and systemic hypertension in 11 (4%). In addition, ventricular (polymorphic, couplets or non-sustained ventricular tachycardia) or ...

Reproducibility of exercise-induced ventricular arrhythmia/PVBs on serial EST or ECG Holter. CV, cardiovascular; EST, exercise stress testing; LBBB, left bundle branch block; NSVT, non-sustained ...