In presence of mitral regurgitation (MR), the rate of pressure rise in early systole (dP/dt max) may be used to evaluate global left ventricular contractility. MR jet velocity depends on the pressure gradient between the LV and left atrium. Using continuous wave Doppler MR spectral is acquired to calculate dP/dt: it represents time duration between change of velocity from 1 to 3 m/s on the MR spectral. The normal value of MR dP/dt is ≥1,000–1,200 mmHg/s and a value of <500 mmHg/s is indicative of severe systolic dysfunction.

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