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研究 Ｌ Ｓ法在预测病人肺动脉压力方面的功效。 方法：对２２ 例患者于术前行肺灌注显像研究，应用 Ｌ Ｓ法计算出肺动脉压力（ Ｐ Ａ Ｐ），并与病人心导管资料或术中测压资料做对比。 结果：计算出的 Ｐ Ａ Ｐ与测出的 Ｐ Ａ Ｐ呈明显相关（ｒ＝ ０．９２， Ｐ＝ ０００１），与病人心胸比率（ｒ＝ ０．７５， Ｐ＝ ０．０００１），肺细血管嵌压（ｒ＝ ０．９０， Ｐ＝ ０．０００９）和全肺阻力（ｒ＝０．８０， Ｐ＝ ０．０１）明显相关；该方法诊断肺动脉高压的敏感度和特异度均为 ９２％ ，阳性抑然比为１１．５，阴性抑然比为０．０８７。 结论： Ｌ Ｓ法可准确直接地预测病人肺动脉压力。
To study the efficacy of L S method in predicting pulmonary artery pressure in patients. Methods: Twenty-two patients underwent lung perfusion imaging before operation. The pulmonary arterial pressure (P A P) was calculated by L S method and compared with the data of cardiac catheterization or intraoperative manometry. Results: The calculated P A P was significantly correlated with the measured P A P (r = 0.92, P = 0001) and was significantly related to the cardiothoracic ratio (r = 0.75, P = 0.0001) (R = 0.90, P = 0.0009) and total lung resistance (r = 0.80, P = 0.01). The sensitivity and specificity of this method in diagnosis of pulmonary hypertension were 92 %, Positive inhibition ratio was 11.5, negative inhibition ratio was 0.087. Conclusion: L S method can accurately and directly predict the patient ’s pulmonary artery pressure.