Open AccessNoninvasive recording of his bundle electrograms using vectorial leads system
Author(s) -
Nojima K.,
Otsuka K.,
Otsuka K.,
Seto K.,
Mori H.
Publication year - 1985
Publication title -
clinical cardiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.263
H-Index - 72
eISSN - 1932-8737
pISSN - 0160-9289
DOI - 10.1002/clc.4960080103
Subject(s) - bundle , medicine , amplitude , signal (programming language) , long axis , position (finance) , signal averaging , anatomy , bundle of his , nuclear magnetic resonance , physics , geometry , optics , electrocardiography , electrical conduction system of the heart , mathematics , telecommunications , analog signal , transmission (telecommunications) , materials science , finance , computer science , economics , composite material , programming language , signal transfer function
His bundle electrograms were recorded in 8 rats by a signal averaging technique using the Takayasu vectorial lead system. Animals were anesthetized and placed in the prone position. The polarity of three orthogonal leads were: the X axis, from right to left; the Y axis, from top to bottom; the Z axis, from back to front. Potentials from the X, Y, and Z leads were amplified by 20,000 with high‐pass 12 dB/octave filtering at 80 Hz, and signal averaging of 2000 beats was performed at a sampling interval of 100 μs. The His bundle potential could be clearly defined in all 8 rats. The mean amplitude of the His potential was larger in the X‐axis (23.6±9.2μV) or the Y‐axis (28.4±14.5μV) than the Z‐axis lead (11.5±8.6μV). Directions of the His potential vectors were to the left in 5 of 8 rats (62.5%), to the caudal in 4 of 6 rats (66.7%), and to the dorsal site in 6 of 8 rats (75.0%). This vectorial lead system, devised in accordance with McFee and Johnston's theory on lead field, was useful for recording His bundle electrograms.