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  • Title: Accessory atrioventricular pathway, supra-, and infrahisian conduction impaired due to mitral annulus calcification.
    Author: Kriwisky M, Goldstein J, Gotsman MS.
    Journal: Clin Cardiol; 1987 Dec; 10(12):818-20. PubMed ID: 3690909.
    Abstract:
    Disorders of conduction occurring simultaneously in both normal and accessory pathways of patients with Wolff-Parkinson-White (WPW) syndrome have only rarely been observed. To our knowledge this is the first report of impaired conduction in both pathways in WPW syndrome due to mitral annulus calcification (MAC). This case of WPW syndrome type A presented the following conduction abnormalities: (1) right bundle-branch block; (2) transient second-degree AV block with prolonged PR interval of the conducted beats; (3) during electrophysiological study, induction of tachycardia, dependent (phase 3) second-degree AV block, and occasionally conduction of two consecutive beats, the second showing an increased H-V interval (from 25 to 60 ms) and left bundle-branch block (LBBB) pattern, due to (4) infrahisian conduction abnormality.
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