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Figure 1 Spectral Doppler recordings of tricuspid regurgitation jet (A), right ventricular outflow (B), mitral inflow (C), and left ventricular outflow (D) in a patient with previous device closure of a secundum atrial septal defect. Intervals a and b are used to calculate myocardial performance index (MPI) for the right and left ventricle as per the formula: MPI = (a – b)/b. bpm = beats/min; CW = continuous-wave Doppler; HR = heart rate; PW = pulsed-wave Doppler.
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