4Jiang L,Stewart WJ,King ME,et al.An improved method for estimation of pulmonary artery pressureusing Doppler velocity time intervals[J].J Am Coll Cardiol.1984,3:613.
5Henry GW.Intraluminal pulsed Doppler evaluation of the pulmonary artery velocity time curve in a canine model of acute pulmonary hypertension[J].Chest.1991,100:474.
6Ambrosino N.Noninvasive mechanical ventilation in acute respiratory failure[J].Eur RespirJ,1996,9:795-807.
7Beard JT,Newman JH,Loyd JE,et al.Doppler estimation of changes in pulmonary artery pressure during hypoxia breathing[J].J Am Soc Echocardiography,1991,4:121.
9Yock PC,, Popp RL. Noninvasive estimation of right ventricular systolic pressure by Doppler ultrasound in patients With tricuspid regurgitation. Circulation, 1984,70 (4): 657 - 662.
