The waveforms' alignment procedure in the averaging process for external recording of the His bundle activity.

Abstract Techniques for external recording of His bundle activity have been based on triggered signal averaging. We report on a new noninvasive method for recording the His potential, which employs cross-correlation function for the waveforms' alignment. This method is a frequency-domain analysis which uses the fast Fourier transform (FFT) for data processing. The processing is completely digital and is accomplished with a CDC-6600 computer. The method was tested by comparing the QRS-triggered signal averaging with the cross-correlation method, using simulated and recorded (real) ECG waveforms. It is concluded that the new method results in a more accurate signal and can be successfully applied in a clinical environment.

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