P2 may be augmented in pulmonary hypertension and diminished in pulmonicstenosis.
肺动脉高血压可加剧P2，肺动脉瓣狭窄时则P 2减轻。
2
Objective: to improve the diagnostic rate of pulmonicstenosis using two dimensional and Doppler echocardiography and to reduce the rate of misdiagnosis.
目的：提高二维及多普勒超声对肺动脉口狭窄的诊断正确率，降低漏诊率。
3
Objective To explore the diagnosis value of contrast echocardiography of right heart in the atrial septal defects (ASD) complicated with pulmonicstenosis (PS).