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Abstract

A method and apparatus for determining A, C, and V waves in an atrial pressure waveform. The method includes the acts of establishing a time reference based on R waves in an ECG. A first interval in the an atrial pressure waveform between a first point offset ahead of a first R wave and a second point offset behind the first R wave is determined. The highest peak within the first interval is then identified. This peak is the A wave. Once the A wave is identified, a second R wave in the ECG, ahead of the first R wave, is identified. A second interval in the atrial pressure waveform that extends from the second point to a third point is established. The third point is positioned at a distance ahead of the second point equal to a percentage of the interval from the second point to a location behind the second R wave. The highest peak in the second interval is the V wave. After identifying the V wave, a third interval in the atrial pressure waveform is established. The third interval extends from the highest peak in the first interval to a fourth point. The fourth point is positioned at a distance ahead of the highest peak in the first interval (the A wave) equal to a second percentage of the distance between the highest peak in the first interval and the highest peak in the second interval (the V wave). The C wave is the highest peak in the third interval.

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