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(A) The current conventional triangle approximation to characterize E- and A-wave shapes. Using this approximation, Epeak, Apeak, the duration of E-wave (Edur), AT, DT, Epeak/Apeak, and EVTI/AVTI are measured. (B) The often observed curvature change (inflection point) of the E-wave contour that is not a feature of the triangle approximation to E-wave shape. See text for details.
