Simultaneous recordings of standard electrocardiographic leads and His bundle potentials demonstrated that bidirectional tachycardia originated in the left ventricle.
Case Report (n=1)
His bundle recordings confirmed that bidirectional tachycardia in a patient with digitalis toxicity originated in the left ventricle, supporting a ventricular origin.
A case of bidirectional tachycardia is presented in a patient with cardiomyopathy, pulmonary emboli, and digitalis toxicity. The arrhythmia has usually been considered ventricular in origin. A supraventricular origin has also been suggested. Simultaneous recordings of standard electrocardiographic leads and His bundle potentials demonstrated that the abnormal rhythm originated in the left ventricle and indeed was a bidirectional ventricular tachycardia. Enhanced phase 4 depolarization in the divisions of the left bundle branch is advanced as a theoretic underlying mechanism in some instances of this arrhythmia.
Cohen et al. (Fri,) conducted a case report in Bidirectional tachycardia (n=1). Simultaneous recordings of standard electrocardiographic leads and His bundle potentials was evaluated on Origin of bidirectional tachycardia. Simultaneous recordings of standard electrocardiographic leads and His bundle potentials demonstrated that bidirectional tachycardia originated in the left ventricle.