Usefulness of a ventricular extrastimulus from the summit of the ventricular septum in diagnosis of septal accessory pathway in patients with supraventricular tachycardia.
To compare usefulness of a ventricular extrastimulus (VES) from the right ventricular (RV) apex versus the RV septum in patients with a septal accessory pathway (AP), VES was applied from the RV apex and the summit of the RV septum in patients with septal APs. A VES from the RV apex and from the summit was diagnostic of the presence of an AP in 13 of 28 patients (83%) and in 10 of 12 patients, respectively (46% p <0.05), and VES proved an AP as a part of the tachycardia circuit in 5 of 28 patients (18%) and 6 of 12 patients, respectively (50%, p <0.05). A VES during His bundle refractoriness from the RV summit increases the diagnostic yield for both the presence of an AP and its participation in the tachycardia circuit with respect to RV apical VES.
Section of Cardiac Electrophysiology, University of California-San Francisco, San Francisco, California 94143, USA.
Takehiko
T
Matsushita
Nitish
N
Badhwar
Kathryn K
KK
Collins
George F
GF
Van Hare
Gaetano
G
Barbato
Byron K
BK
Lee
Randall J
RJ
Lee
Melvin M
MM
Scheinman
D000293:Adolescent; D000328:Adult; D000368:Aged; D002036:Bundle of His / Q000503:physiopathology; D002648:Child; D004558:Electric Stimulation / Q000379:methods*; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac / Q000379:methods*; D005260:Female; D006346:Heart Septum / Q000503:physiopathology*; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015398:Signal Transduction / Q000502:physiology*; D013617:Tachycardia, Supraventricular / Q000503:physiopathology* / Q000628:therapy