Clinical trial of the non-invasive recording of His-Purkinje system signals

A clinical system has been developed to detect His-Purkinje System (HPS) signals using surface recording technology and ensemble averaging. The reproducibility of this non-invasive methodology for recording Hisbundle signals in normal human volunteers has been. tested in a controlled clinical environment. The study recorded HPS signals from eight healthy volunteers, undosed, on placebo and following a single dose of beta-blocker (atenolol). This allowed the effects of the atenolol on the His-bundle intervals to be observed in a controlled fashion. A late notch (H) is recorded about 15ms before ventricular activation for most subjects in both dosed and un-dosed conditions. However in some subjects there is a distinct increase in the A-H interval with atenolol. This indicates that the H-notch originates from the conduction system.