3. Echocardiographic evaluation of mitral regurgitation (MR) using comprehensive multi-parameter method
The evaluation of MR was based on the diagnostic criteria for heart valve disease published by American College of Cardiology (AHA) in 2017[6] and the Chinese expert consensus on echocardiographic evaluation of interventional treatment of MR[7]. Within 24 hours before CPVA, MR was evaluated during sinus rhythm and under stable clinical conditions (blood pressure control, optimal medical treatment).The vena contracta width (VCW, cm) on the parasternal long-axis plane under ZOOM mode was used as the main evaluation index of the degree of MR, the effective regurgitant orififice area (EROA) and the regurgitant volume (RVol)measured by PISA method was used as the second reference index, (1)VCW<3 mm means mild MR; (2)VCW≥3,<7mm means moderate MR;(3)VCW>7 mm imeans severe MR(Table 1). All patients received echocardiography within 3 months after the operation.