Intraoperative recording of the His bundle electrogram in man. An assessment of its precision

M Dick, E Krongrad, R E Antar, S Ross, F O Bowman, J R Malm, B F Hoffman
1976 Circulation  
To estimate the effect of distance between the electrode and the signal source on the amplitude of the His bundle electrogram (HBE) recorded during open heart surgery, a specially designed probe, containing six pairs of closely spaced (1 mm) electrodes was placed on the endocardial surface of the right atrium such that each electrode pair was parallel to the course of the His bundle. The amplitude of the HBE recorded through electrodes closest to the His bundle ranged from 0.76 to 3.44 mV, at 1
more » ... 76 to 3.44 mV, at 1 mm from 0.38 to 1.13 mV, at 2 mm from 0.27 to 0.86 mV, and at 3 mm from 0.2 to 0.44 mV. Maximal amplitude of HBE decreased by 57% at I mm, 73% at 2 mm, and 82% at 3 mm. JR: Specialized cardiac conduction system: Improved electrophysiologic identification technique at surgery.
doi:10.1161/01.cir.53.2.224 pmid:942690 fatcat:ufu46kqdlfggfasve5drl6ywwq