Objective To observe the changes of serum cystatin C(Cys C) in patients with coronary heart disease(CHD) and normal kidney function ,and evaluate the predictive value of Cys C concentration on coronary arterial lesions .Methods Serum levels of Cys C were detected in 316 patients with coronary heart disease and normal renal function .The relationship between serum 1evels of Cys C and coronary heart disease was evaluated from three aspects :the number of diseased vessels ,the severity of diseased ves‐sels and the CHD Gensini scores .Results The Cys C level in CHD group was significantly higher than that of non‐CHD group [(1 .24 ± 0 .32)mg/L vs .(1 .12 ± 0 .27)mg/L ,P<0 .01] .Serum Cys C was significantly higher in the multi‐vessel disease group than that of the single‐vessel disease group[(1 .31 ± 0 .31)mg/L vs .(1 .20 ± 0 .32)mg/L ,P<0 .01] .Serum Cys C was significantly higher in the severe coronary artery stenosis group than in the mild stenosis group [(1 .29 ± 0 .36)mg/L vs .(1 .16 ± 0 .23)mg/L , P<0 .01] .Cys C was positively correlated with the Gensini scores of coronary arterial lesion (r=0 .195 ,P<0 .01) .Conclusion Cys C levels increased in patients with coronary heart disease and normal renal function .Cys C was positively correlated with the Gensini scores of coronary arterial lesion .Serum Cys C levels has certain predictive value on coronary arterial lesions in patients with CHD .%目的：观察肾功能正常的冠心病患者血清胱抑素C水平（Cys C）变化，探讨Cys C对冠状动脉病变严重程度的预测价值。方法检测316例肾功能正常的冠心病者及102例无冠心病者Cys C水平，从冠状动脉病变支数、冠状动脉狭窄程度、冠状动脉病变Gensini总评分三方面分析Cys C水平与冠心病之间的关系。结果冠心病组Cys C水平较对照组升高[（1．24±0．32）mg／L vs ．（1．12±0．27）mg／L ， P＜0．01）]；多支病变组Cys C水平较单支病变组显著升高[（1．31 ± 0．31）mg／L vs ．（1．20 ± 0．32）mg／L ，P＜0．01]；冠状动脉严重狭窄组Cys C水平较轻度狭窄组显著升高[（1．29 ± 0．36）mg／L vs ．（1．16 ± 0．23）mg／L ，P＜0．01]，且冠心病患者Cys C与冠状动脉病变Gensini评分呈正相关（r＝0．195，P＜0．01）。结论冠心病患者Cys C水平增高，且与冠状动脉病变程度呈正相关。血清Cys C水平对冠状动脉病变程度具有一定的预测价值。
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