Fig. 2
QPD calculations of MRvol assuming that the MA is circular geometry. a The diameter of LVOT was measured in the PLAX view, and the CSALVOT was derived as 0.785 d2. d LVOT pulsed Doppler was traced to obtain the VTILVOT. Thus, SVLVOT = 0.785 d2 × VTILVOT = 0.785 × 1.962 × 28.8 = 86.85 ml. b and c The diameter of MA was measured in the A4C and A2C view. The CSAA4C was derived as 0.785 × 3.22, and CSAA2C was derived as 0.785 × 2.712. e MA inflow pulsed Doppler was traced to obtain the VTIMA. Thus, SVA4C = 0.785 × 3.22 × 19.2 = 154.33 ml, and SVA2C = 0.785 × 2.712 × 19.2 = 110.69 ml. In this example of MR, MRvol by QPD-MAA4C = SVA4C - SVLVOT = 154.33–86.85 = 67.48 ml, and MRvol by QPD-MAA2C = 110.69–86.85 = 23.84 ml