肾移植术后随访中检测受者血清胱抑素C的临床价值

目的 探讨血清胱抑素C(SCys C)浓度检测能否作为肾移植受者随访中移植肾功能测定的理想指标.方法 选择肾移植术后接受长期随访的受者70例,于随访当日检测受者SCys C和血清肌酐(SCr)水平,同时用99mTc-DTPA肾动态显像测定肾小球滤过率(GFR),比较SCys C和SCr与GFR的相关性,并应用受试者工作特征曲线(ROC曲线)评价两者在诊断移植肾功能轻度损伤(GFR＜1 ml/s)中的效果.结果 随访的肾移植受者中,SCys C和SCr与GFR均呈负相关,相关系数分别为-0.82和-0.66(P＜0.01).SCys C用于诊断移植肾功能轻度损伤的敏感度、特异度和阳性预测值(PPV)均高于SCr.SCys C的ROC曲线下面积高于SCr(分别为0.935和0.877),但两者比较,差异无统计学意义(P＞0.05).结论 在肾移植术后的随访中,受者SCys C与GFR的相关性比SCr更高,可作为评估移植肾功能的较理想指标.

Assessment of glomerular filtration rate in renal transplant recipients using serum cystatin C during follow-up

Objective To evaluate whether serum cystatin C (SCys C) could be used as an ideal index to assess renal function of renal transplant recipients during posttransplant follow-up.Methods Seventy patients who were followed up for at least 6 months after renal transplantation in our centre were recruited in the study. SCys C and serum creatinine (SCr) were determined during the follow-up period, and glomerular filtration rate (GFR) was measured using an isotope Tc99m DTPA.The correlation between SCys C, SCr and GFR was analyzed. The performance of SCys C and SCr in diagnosing the mild impairment of renal allgraft function (GFR ＜ 1 ml/s) was evaluated using ROC curve. Results Both SCys C and SCr had a linear negative correlation with GFR (r = -0. 82 and -0. 66 respectively, P＜0. 01 ). The sensitivity, specificity and positive predictive values (PPV) of SCys C for diagnosing the mild impairment of renal allgraft function were higher than those of SCr,but the AUC of SCys C did not differ from that of SCr significantly (0. 935 vs. 0. 877, P＞0. 05).Conclusion SCys C could be used an ideal index to evaluate the allograft renal function for its better correlation with actual GFR.