Bundle branch aberrancy in predicting mechanism of SVT

0 2 332 8 months ago
The VA interval increases from 100 msec to 189 msec as the tachycardia becomes broader, contributing to slowing of SVT as aberrancy develops. Fig 3 and 4 show the corresponding intracardiac electrograms of narrow and wide complex tachycardia. The atrial activation sequence during tachycardia shows earliest atrial electrograms in distal CS (CS 12) suggesting involvement of a left sided accessory pathway. The slowing of tachycardia in SVT with the development of bundle branch block indicates the presence of accessory pathway on the same side. In this case the increase in tachycardia cycle length with development of LBBB denotes the participation of left sided accessory pathway in the SVT

Last seen:  1 day ago

cardiologist, electrophysiologist.

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