1975 年 16 巻 6 号 p. 629-638
Our studies recently conducted on the correlation between pulmonary vascular resistance and pulmonary arterial diastolic pressure in 467 cases, identified an extremely high correlation between the two. The correla-tion coefficient between pulmonary arterial diastolic pressure (PAdp) and pulmonary to systemic resistance ratio (Rp/Rs) was 0.799 and that between pulmonary vascular resistance index (RP-index) and PAdp was found to be 0.791. And a still higher correlation was observed between pul-monary vascular resistance and pressure gradient between PAdp and left atrial mean pressure (LAmp), where the correlation coefficient between Rp/Rs and (PAdp-LAmp) was 0.851 and that between Rp-index and (PAdp-LAmp) was 0.813.
Those correlations are found to be higher in degree than the correla-tions between pulmonary arterial mean pressure or pulmonary arterial systolic pressure and pulmonary vascular resistance, leading to the con-clusion that the pulmonary arterial diastolic pressure is of extremely high clinical importance as an index for increase in pulmonary vascular re-sistance