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a. Tei index is defined by the equation (a-b)/b, where “a” represents the interval between cessation and onset of mitral inflow, and “b” represents the ejection time of the left ventricular outflow. b. The isovolumic relaxation time was measured by dual Doppler echocardiography, with the green imaginary line representing the end of aortic flow and the yellow full line representing the beginning of mitral flow
