Rajaram P C, Razak R, Lakshmikanthan C
Angiology. 1979 Sep;30(9):610-9. doi: 10.1177/000331977903000905.
Chest roentgenograms of 125 patients (115 with pure or predominant mitral stenosis) were studied by the pulmonary arterial angle method to estimate systolic pulmonary artery pressure without prior knowledge of catheterization data. First the angle between the line drawn along the right upper lobe artery and the tangent drawn along the point of junction of superior and lateral borders of the right pulmonary artery was determined. Next the angle between the right middle lobe artery and the descending pulmonary artery is determined. The difference between these angles equals systolic pulmonary artery pressure. Catheter and angle values were identical in 26 patients. There was a 1- to 5-mm difference in 70, a 6- to 10-mm difference in 18, an 11- to 15-mm difference in 8, and a difference greater than 15 mm in 3.
采用肺动脉角法对125例患者（115例为单纯或主要为二尖瓣狭窄）的胸部X线片进行研究，以在不预先了解心导管检查数据的情况下估计收缩期肺动脉压。首先确定沿右上叶动脉绘制的线与沿右肺动脉上缘和外侧缘交界处绘制的切线之间的角度。接着确定右中叶动脉与降肺动脉之间的角度。这两个角度的差值等于收缩期肺动脉压。26例患者的导管测量值与角度测量值相同。70例患者两者相差1至5毫米，18例相差6至10毫米，8例相差11至15毫米，3例相差大于15毫米。
