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Updated: Oct 23, 2026

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
Published on: November 7, 2019
Fourier analysis of cardiac action potentials
Abstract:
Fourier analysis of the repolarization phases of cardiac action potentials showed clear differences in the frequency characteristics of atrial and ventricular recordings. The frequency spectrum of the atrial repolarization phase was in the range of 0-45Hz, with a predominant power spectral density between 0-15Hz. The frequency spectrum of the ventricular repolarization phase was in the range of 0-20Hz, with a predominant power spectral density between 0-10Hz. Physiological changes that accentuate the differences in shape between atrial and ventricular APs also accentuate the differences in frequency spectrum of their repolarization phases. Fourier analysis therefore could be a complement to the current methods used to describe and quantify differences in the shape of cardiac action potentials.
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