Population
9 patients with left bundle-branch block (LBBB), normal QRS axis, and normal P-R interval
Design
Case_series
Authors
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May indicate trifascicular involvement in LBBB with normal axis; leaves open whether EP testing informs prognosis or therapy.
Electrophysiological testing in patients with LBBB and normal QRS axis reveals trifascicular conduction abnormalities and functional silence of the left posterior fascicle.
Cannom et al. (1972) studied this question.
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