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. Author manuscript; available in PMC: 2011 Mar 1.

Published in final edited form as: Pacing Clin Electrophysiol. 2009 Dec 16;33(3):274–285. doi: 10.1111/j.1540-8159.2009.02642.x

A. ECG of the index patient (II-1) at rest shows 1^st degree AV block associated with incomplete right bundle branch block (IRBBB). B. Recorded from proband during stress test. ECG shows accentuation of R’ in right precordial leads suggestive of accentuation of IRBBB as well as the development of bifid T waves in the left precordial leads and enlarged P waves. C. Following the stress test, his heart rate returned to 60 bpm, although P wave and r’ in V₂ remain enlarged and QTc is slightly prolonged. D. ECG of proband’s 15 year old daughter (patient III-1) shows a PR interval of 178 ms (borderline first degree AV block) and bradycardia (HR, 51 bpm). E. ECG of proband’s 13 yr. old daughter (patient III-2) shows 1^st degree AV block, bradycardia, and sinus arrhythmia.

A. ECG of the index patient (II-1) at rest shows 1^st degree AV block associated with incomplete right bundle branch block (IRBBB). B. Recorded from proband during stress test. ECG shows accentuation of R’ in right precordial leads suggestive of accentuation of IRBBB as well as the development of bifid T waves in the left precordial leads and enlarged P waves. C. Following the stress test, his heart rate returned to 60 bpm, although P wave and r’ in V₂ remain enlarged and QTc is slightly prolonged. D. ECG of proband’s 15 year old daughter (patient III-1) shows a PR interval of 178 ms (borderline first degree AV block) and bradycardia (HR, 51 bpm). E. ECG of proband’s 13 yr. old daughter (patient III-2) shows 1^st degree AV block, bradycardia, and sinus arrhythmia.