BeforeoperationJustafteroperation GroupⅠ（n=36）GroupⅡ（n=59）GroupⅠ（n=36）GroupⅡ（n=59）MVA（cm2）0.74±0.231.19±0.24△1.52±0.301.66±0.20Meanleftatrialpressure（mmHg）32.2 ±6.715.8 ±4.5△12.1 ±5.78.87±3.88Pulmonaryarterialsystolicpressure（mmHg）103.8 ±21.239.6 ±4.6△55.2 ±6.129.3 ±3.8△Meanpulmonaryarterialpressure（mmHg）64.8 ±12.025.0 ±4.6△36.3 ±10.620.4 ±4.0△NYHA3.33±0.532.42±0.69△2.30±0.581.98±0.43
