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Doppler tissue velocities and time intervals obtained at lateral tricuspid valve annulus. Aa, Peak velocity during atrial contraction; AT, acceleration time; Ea, peak velocity during early diastole; ET, ejection time; IVA, myocardial acceleration during isovolumic contraction; IVV, peak myocardial velocity during isovolumic contraction; Sa, peak velocity during ejection period of systole.