心脏储备指数和射血分数量化心功能分级的相关性研究

目的研究心音图运动试验的心脏储备指数（CRI）与X线左心室造影射血分数（EF）量化纽约心功能分级的相关性。方法对79例志愿者进行心音图运动试验，得到运动前后S1幅值、心率与6min步行距离，求出CRI，并进行X线造影得到左心室EF。结果随着纽约心功能分级的增加，CRI与EF均降低（P〈0．005）。EF与CRI呈正相直线相关关系，r=0．79（P〈0．001）。CRI与纽约心功能分级的符合率为63．29％（P〈0．01）。结论CRI和EF可作为客观量化心功能分级的客观指标，且CRI对心功能的总体评价较EF更全面。

A correlation study on cardiac reserve index and ejection fraction for quantifying heart function classification

Objective to study the correlation of cardiac reserve index(CRI) obtained from phonocardiogram exercise test(PCGET) and ejection fraction(EF) measured by left ventricular x-ray contrast examination for quantifying heart function classification.Methods PCGET was performed for 79 volunteers.The amplitude of the first heart sound,heart rate,and walking distance during 6 min walking test were measured,and CRI was calculated.EF values for each subject was obtained from left ventricular x-ray contrast examination.Results Both CRI and EF decreased as the increase in NYHA FC(P<0.005).There was a positive correlation between EF and CRI,r=0.79(P<0.001).The coincident rate between CRI and NYHA FC was 63.29%(P<0.01).Conclusion CRI and EF might be used as sujective indicators for quantifying heart function classification and CRI might be more comprehensive for evaluating cardiac function than EF.