Key result
Simultaneous intracardiac recordings demonstrated that left bundle to ventricular activation time ranged from 20 to 25 msec, supporting simultaneous bilateral septal activation.
Population
8 patients (5 with normal A-V conduction, 1 with left axis deviation, 2 with bundle-branch block)
Design
Case_series
Authors
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Case-level data should not alter practice; leaves open generalizability of simultaneous bilateral septal activation.
Observational (n=8)
Simultaneous recordings of the His bundle and bundle branches from both sides of the heart demonstrate that interventricular septal activation occurs almost simultaneously on both sides in normal conduction.
Narula et al. (1970) conducted an observational in Normal A-V conduction, left axis deviation, or bundle-branch block (n=8). Simultaneous intracardiac recordings from left and right heart was evaluated on Electrogram durations and conduction times (BH, LB, RB, LB-V, RB-V). Simultaneous intracardiac recordings demonstrated that left bundle to ventricular activation time ranged from 20 to 25 msec, supporting simultaneous bilateral septal activation.
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