Long RP interval tachycardia. What is the mechanism?

A long RP tachycardia: what is the tachycardia mechanism?

A 75-year-old man underwent an electrophysiologic procedure because of recurrent palpitations and documented tachycardia. At baseline, there was sinus rhythm with right bundle branch block. Programmed stimulation demonstrated anterograde dual AV nodal physiology. A regular, long RP tachycardia with a cycle length of 540 msec and inverted P waves in the inferior leads was induced by atrial overd...

A Wide QRS Complex, Long RP Tachycardia:

A 78-year-old man underwent an electrophysiologic procedure because of a 25-year history of recurrent episodes of paroxysmal tachycatdia. A wide QRS complex tachycardia that had a long RP interval wa.s induced by ventricular pacing (Fig. 1). The cycle length of the tachycardia was 540 msec. An atrial extrastitiiulus introduced in the high right atrium during the first half of diastole terminate...

Identical atrio-His interval and A-A intervals during long RP tachycardia: what is the mechanism? Diagnosis: Atypical AVNRT.

A Long RP' Interval Tachycardia: what is the mechanism?

A 34-year-old woman with a long history of paroxysmal supraventricular tachycardia underwent an electrophysiologic procedure. The baseline sinus cycle length, atrial-His (AH), and His-ventricular (HV) intervals were 720, 70, and 50 msec, respectively. A narrow-QRS complex tachycardia was induced by ventricular pacing at a cycle length of 380 msec (Fig. 1). The tachycardia cycle length was 400 m...

V-A-A-V Activation Sequence at the Onset of a Long RP Tachycardia: What is the Mechanism?

A 52-year-old woman with a history of multiple episodes of paroxysmal supraventricular tachycardia underwent electrophysiologic studies and a catheter ablation procedure. The 12-lead electrocardiogram during tachycardia showed a long RP tachycardia with negative P waves in leads II, III, and aVF. At baseline, dual atrioventricular (AV) and ventriculoatrial (VA) nodal conduction was elicited by ...