Noninvasive recording of the His bundle electrogram in neonates

Abstract

Twenty-seven normal, nonsedated neonates had high-resolution electrocardiography performed during the first four days of life. Using high amplification, analogue and digital filters, and signal averaging, easily defined His bundle deflections of 0.75-7.75 (mean 2.5) microV were detected in 25 (92.6%) of the 27 babies. The PH interval was 60-105 (mean 83) ms and the HV interval 10-25 (mean 17) ms. Surface His bundle electrocardiography is easily performed in the neonate and, as might be predicted, conduction intervals are considerably shorter than those seen in older age groups.

Noninvasive recording of His bundle activity with an analog delay device in normal subjects and patients with atrioventricular block

“…Subsequently, a noninvasive or virtually noninvasive method of recording His bundle activity was developed to overcome the limitations and complications involved in the use of the catheter technique as a routine examination [6]. The previous investigations on the noninvasive recording of His bundle activity were generally performed by the computer average response technique [7,8,[10][11][12][15][16][17][18], or by using exclusive averaging hardware [6,9,13,14,20]. For the averaging method to significantly improve the signal-to-noise ratio, the process of averaging must be driven by the trigger pulse with very accurate timing during the repeated processing.…”