Results The degree of pulmo nary stenosis is preperation to pulmonary flow velocity. ontrasting the pulmonary flow velocity before and after opera tion, the effect can be accessed.

• 结果肺动脉瓣狭窄程度与肺动脉内血流速度成正比例关系，对照手术前后肺动脉内血流速度，可估价手术效果。