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A Long‐RP Interval Tachycardia:
Author(s) -
Chugh Aman,
Morady Fred
Publication year - 2003
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1046/j.1540-8167.2003.03008.x
Subject(s) - medicine , library science , citation , cardiology , computer science
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 msec, the AH interval was 140 msec, and the His-atrial (HA) interval was 250 msec. The response to a single ventricular extrastimulus delivered during tachycardia when the His bundle was refractory is shown in Figure 2. During tachycardia, the earliest atrial activation was recorded at the ostium of the coronary sinus. What is the mechanism of the tachycardia?