Abstract
In two infants with Wolff-Parkinson-White type B, right bundle branch block was concealed during sinus rhythm and pacing from close to the atrial entrance of the right-sided accessory pathway. However, pacing from the vicinity of the A-V node, the A-V node itself, and the His bundle exposed the right bundle branch block by producing exclusive ventricular activation through the normal, A-V nodal His-Purkinje pathway. In addition, pacing from close to the A-V node also resulted in fusion beats characterized by absence of delta waves with (pseudo) normal QRS complexes and short H-V intervals. False patterns of tachycardia-dependent and bradycardia-dependent block in the accessory pathway also occurred. These dynamic phenomena were attributed to the (peri-A-V nodal) pacing-related, relatively early arrival of excitation at the ventricles through the normal pathways coexisting with delayed arrival of excitation via the accessory pathway. The latter in turn was due to the longer intra-atrial conduction time from paced (peri-A-V nodal) site to atrial entrance of the accessory pathway.
| Original language | English |
|---|---|
| Pages (from-to) | 662-668 |
| Number of pages | 7 |
| Journal | American Heart Journal |
| Volume | 96 |
| Issue number | 5 |
| DOIs | |
| State | Published - Jan 1 1978 |
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ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine
Cite this
Exposure of concealed right bundle branch block in Wolff-Parkinson-White type B by pacing from the vicinity of the A-V node. / Garcia, Otto L.; Castellanos, Agustin; Sung, Ruey J.; Gelband, Henry.
In: American Heart Journal, Vol. 96, No. 5, 01.01.1978, p. 662-668.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Exposure of concealed right bundle branch block in Wolff-Parkinson-White type B by pacing from the vicinity of the A-V node
AU - Garcia, Otto L.
AU - Castellanos, Agustin
AU - Sung, Ruey J.
AU - Gelband, Henry
PY - 1978/1/1
Y1 - 1978/1/1
N2 - In two infants with Wolff-Parkinson-White type B, right bundle branch block was concealed during sinus rhythm and pacing from close to the atrial entrance of the right-sided accessory pathway. However, pacing from the vicinity of the A-V node, the A-V node itself, and the His bundle exposed the right bundle branch block by producing exclusive ventricular activation through the normal, A-V nodal His-Purkinje pathway. In addition, pacing from close to the A-V node also resulted in fusion beats characterized by absence of delta waves with (pseudo) normal QRS complexes and short H-V intervals. False patterns of tachycardia-dependent and bradycardia-dependent block in the accessory pathway also occurred. These dynamic phenomena were attributed to the (peri-A-V nodal) pacing-related, relatively early arrival of excitation at the ventricles through the normal pathways coexisting with delayed arrival of excitation via the accessory pathway. The latter in turn was due to the longer intra-atrial conduction time from paced (peri-A-V nodal) site to atrial entrance of the accessory pathway.
AB - In two infants with Wolff-Parkinson-White type B, right bundle branch block was concealed during sinus rhythm and pacing from close to the atrial entrance of the right-sided accessory pathway. However, pacing from the vicinity of the A-V node, the A-V node itself, and the His bundle exposed the right bundle branch block by producing exclusive ventricular activation through the normal, A-V nodal His-Purkinje pathway. In addition, pacing from close to the A-V node also resulted in fusion beats characterized by absence of delta waves with (pseudo) normal QRS complexes and short H-V intervals. False patterns of tachycardia-dependent and bradycardia-dependent block in the accessory pathway also occurred. These dynamic phenomena were attributed to the (peri-A-V nodal) pacing-related, relatively early arrival of excitation at the ventricles through the normal pathways coexisting with delayed arrival of excitation via the accessory pathway. The latter in turn was due to the longer intra-atrial conduction time from paced (peri-A-V nodal) site to atrial entrance of the accessory pathway.
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U2 - 10.1016/0002-8703(78)90204-1
DO - 10.1016/0002-8703(78)90204-1
M3 - Article
VL - 96
SP - 662
EP - 668
JO - American Heart Journal
JF - American Heart Journal
SN - 0002-8703
IS - 5
ER -