Abstract
Two 4-electrode, VCG lead systems have been compared, under clinical conditions, with a theoretically more accurate 7-electrode system, in 40 patients. All systems used the appropriate resistance-combining networks embodying correcting factors determined from torso models. One of the 4-electrode systems, the RLFB, which was based on the Wilson tetrahedron, had been compared with the 7-electrode system by Frank and Seiden, and had been rejected on the grounds of insufficient accuracy. The other 4-electrode system, the RAFE, was designed, unlike previous systems, to give optimal convenience of application. The results showed: 1. 1. Under conditions obtaining with ill patients, the RAFE showed a highly significant advantage with respect to accuracy as compared with the RLFB. This was due largely to improvement in the recording of sagittal components. 2. 2. The signal-to-noise ratio with the RAFE was close to that obtained with the 7-electrode system and much greater than that with the RLFB. The results indicate that the optimal convenience provided by the RAFE lead system is achieved at a relatively small cost in accuracy and signal magnitude. They suggest the use of this electrode arrangement at least in seriously ill patients, who would be unduly disturbed by the application of the 7-electrode system.
Published Version
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