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Table 4 Comparison ascending aortic flow pattern parameters before and after valve replacement

From: Differential flow improvements after valve replacements in bicuspid aortic valve disease: a cardiovascular magnetic resonance assessment

  AVR-mechanical AVR-tissue
Pre-AVR Post-AVR p-value Pre-AVR Post-AVR p-value
Number 10 10   6 6  
Absolute rotational flow (mm2/ms) 30.4 ± 16.3 7.3 ± 4.1 p = 0.001 35.6 ± 23.1 22.2 ± 6.0 p = 0.18
Systolic WSScircavg (N/m2) 1.02 ± 0.21 0.68 ± 0.21 p = 0.001 1.04 ± 0.20 0.70 ± 0.21 p = 0.048
Absolute systolic in-plane WSS (N/m2) 0.47 ± 0.20 0.20 ± 0.13 p = 0.001 0.56 ± 0.32 0.44 ± 0.19 p = 0.41
Max systolic through-plane WSS (N/m2) 1.43 ± 0.54 0.92 ± 0.39 p = 0.04 1.47 ± 0.34 0.75 ± 0.21 p = 0.01
RA-LP systolic WSScircavg (N/m2) 0.55 ± 0.66 0.28 ± 0.23 p = 0.19 0.77 ± 0.29 0.25 ± 0.27 p = 0.03
Systolic flow angle (°) 26.5 ± 9.3 17.1 ± 9.8 p = 0.77 23.8 ± 9.4 20.2 ± 7.2 p = 0.41
Normalised flow displacement 0.126 ± 0.093 0.069 ± 0.065 p = 0.18 0.166 ± 0.053 0.141 ± 0.068 p = 0.54
Peak velocity (m/s) 3.4 ± 1.5 2.0 ± 0.5 p = 0.02 3.7 ± 0.8 2.1 ± 0.4 p = 0.001
Regurgitant fraction (%) 38 ± 19 3 ± 2 p < 0.001 12 ± 14 2 ± 2 p = 0.21
Left ventricular ejection fraction (%) 71 ± 9 68 ± 16 p = 0.68 75 ± 9 75 ± 5 p = 0.91
  1. Values are mean ± standard deviation except where indicated; BAV = bicuspid aortic valve; AVR = aortic valve replacement; WSS = wall shear stress; WSScircavg = circumferentially averaged wall shear stress; RA-LP = right anterior – left posterior