多普勒超声和心导管同步测定肺动脉楔压

目的探讨连续波多普勒超声在评估二尖辨返流患者的肺动脉楔压中的作用。方法对59例患者进行多普勒超声和左、右心导管检查，同步测定肺动脉楔压，经多普勒测得的肺动脉楔压是用估测的左室收缩压减去测得的二尖瓣返流压差。结果对于正常肺血管阻力的患者，经多普勒测得的肺动脉楔压与心导管测定的肺动脉楔压存在高度相关（r=0.964）；然而，这两种技术测定的肺动脉楔压在肺血管阻力升高的患者中低度相关（r=0．596）。结论连续波多普勒超声尽管在无创性评估肺动脉楔压中有一些局限性，但仍不失为一项可靠并且准确的技术。

Measurement of Pulmonary artery wedge pressure using Doppler ultrasound diagnositic apparatus and cardiac catheter

[Objective] To confirm the utility of continuous wave Doppler echocardiography in assessing pulmonary artery wedge pressure in patients with mitral regurgitation. [Methods] 59 patients underwent simultaneous determination of the pulmonary artery wedge pressure by Doppler and left and right cardiac catheterization. Doppler-derived pulmonary artery wedge pressure was determined using the estimated left ventricular systolic pressure minus the measured mitral regurgitant gradient. [Results] A high correlation (r =0.964) and a close agreement were observed between Doppler and catheter-determined pulmonary artery wedge pressures in patients with normal pulmonary vascular resistance. However, there was a lower correlation (r =0.596) in pulmonary artery wedge pressures between the two techniques in patients with elevated pulmonary vascular resistance. [Conclusion] Continuous wave Doppler echocardiography is a useful and accurate technique which nevertheless has some limitations in the non-invasive assessment of pulmonary artery wedge pressure.