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A methodology is described for noninvasive recording of the electrical activity generated by the His-Purkinje system of man utilizing filtering, high amplification, and signal averaging. A waveform ranging between 1 and 10mu V was observed during the P-R segment. In many individuals, there was temporal overlap between the terminal P wave and the initial portion of the His-Purkinje waveform. In ten patients with long P-R intervals there was a strong correlation (r greater than 0.95) between the H-V time measured by electrode catheter and the duration of the His-Purkinje waveform. In two patients with atrial fibrillation the resultant His-Purkinje waveform was similar in morphology and duration to those observed in the ten patients. In each group H-V time was determined noninvasively and a waveform associated with electrical activation of the major portions of the His-Purkinje system was obtained.

The His-Purkinje electrocardiogram in man: an initial assessment of its uses and limitations.