His bundle electrography demonstrated that the bidirectional tachycardia, precipitated by effort and emotional stress, was ventricular in origin.
Case Report (n=1)
This is a report of a case of bidirectional tachycardia in a 6-year-old girl with no evidence of any structural abnormality of the heart. The patient had never received digitalis. The arrhythmia appeared to be precipitated by effort and emotional stress, and could be induced by increasing the heart rate by atrial pacing or isoprenaline administration. His bundle electrography showed that the arrhythmia was ventricular in origin. This emphasizes the importance of recording an effort electrocardiogram in all children with unexplained syncopal episodes, even when the resting electrocardiogram is normal.
Reid et al. (Sat,) conducted a case report in Bidirectional tachycardia (n=1). His bundle electrography was evaluated on Origin of arrhythmia. His bundle electrography demonstrated that the bidirectional tachycardia, precipitated by effort and emotional stress, was ventricular in origin.