Objective To validate the four chronic kidney disease epidemiology collaboration (CKD-EPI) predictive equations based on serum creatinine (SCr) and cystatin C (Cys C) in Chinese CKD patients,and try to develop the GFR predictive equations for Chinese CKD patients.Methods254 CKD patients were randomly selected from four Grade ⅢA hospitals in different regions in China from September 2007 to December 2010.Clearance of dual plasma sampling 99mTc-DTPA was used to measure glomerular filtration rate (rGFR) in 254 CKD patients.The serum concentration of Cr and Cys C were measured.CKD-EPI SCr equation,Cys C equation,Cys C equation adjusted for age,sex and race,SCr/Cys C combinated equation adjusted for age,sex and race were used to estimate GRF ( labeled as eGFR1,eGFR2,eGFR3 and eGFR4,respectively).The correlation,bias and precision of eGFRs were compared with rGFR by Wilcoxon signed rank test,intraclass correlation coefficient (ICC) and Spearman correlation analysis.The deviation degree between rGFR and different eGFRs was compared via Bland-Altman graph.The accuracy within 15％,25％,30％ ( P15,P25,P30) and the staging correctness of eGFR against CKD at different stages was calculated.ResultsThe rGFR in 254 CKD participants was [ 48.07 (26.19 -92.97 )] ml · min -1·(1.73 m2) -1.The Spearman correlatiou coefficients (CC) of eGFR and rGFR varied within the range of 0.873 - 0.896 ( P =0.000 ).The intra-class CC ( ICC ) varied within the range of 0.920 - 0.942.The correlation of eGFR4 was the best.The absolute deviations of 4 eGFRs and deviation precision were eGFR4 ＜eGFR3 ＜ eGFR2 ＜ eGFR1.The 95％ confidence intervals for the regression line of 4 eGFRs shown by Bland-Altman graphs were 92.5,87.3,83.0 and 76.1 ml · min-1 · ( 1.73 m2 ) -1,respectively,with the best result of eGFR4.For P30,the correctness of 4 eGFRs were eGFR4 ＞ eGFR3 ＞ eGFR2 ＞ eGFR1,but no significant difference was found by Chi square test (x2 =6.448,P =0.092).The overall correctness rate in 4 eGFRs against CKD stages were 48.4％ -57.5％,with the highest consistency of eGFR4,but their staging correctnessratewerenotideal(Kappa values were 0.405,0.348,0.366 and 0.463,respectively).Conclusions Compared with CKD-EPI SCr equation,no advantage was found in CKD-EPI Cys C equation.The Cys C equation adjusted by age and sex shows a little advantages over CKD-EPI Cys C equation in bias,precision,correlation and accuracy.The CKD-EPI SCr/Cys C combinated equation adjusted by age,sex and race has advantage over other three equations not only in bias,precision,correlation and accuracy,but also in staging correctness.However,the validation of this equation is still not fairly ideal for Chinese CKD patients.Based on these findings,it is essential for the Chinese CKD patients to develop SCr/Cys C combined predictive equation which adjusted by age,sex or other factors.(Chin J Lab Med,2012,35:798-804)

Objective:To report the clinical characteristics, diagnosis and treatment of a patient with linear scleroderma en coup de sabre (LSCS), and review the relevant literature in order to provide the basis for early diagnosis and timely treatment of the disease.Methods:The clinical data and treatment process of a patient with LSCS admitted to Hangzhou Traditional Chinese Medicine Hospital Affiliated to Zhejiang Chinese Medical University on September 22, 2022 were summarized, and the case reports or case series studies related to LSCS with epilepsy or Coats-like response at home and abroad were systematically analyzed. The gender, age, onset time, clinical manifestations, treatment and prognosis of this type of patients were summarized.Results:The patient is a 22 years old female with a history of scalp patchy alopecia and ipsilofrontal en coup de sabre for over 10 years and was diagnosed as Coasts disease due to decreased vision in the right eye 5 years ago, and now she is blind. This visit was due to "episodic loss of consciousness for more than 2 hours" with epileptic seizures and Coats-like response of the left eye. Treatment with antiepileptic drugs, glucocorticoids and immunosuppressants showed satisfactory results. The clinical data of all 20 patients with LSCS reported in domestic and foreign literature were analyzed. The age of onset was 11.00 (6.75, 20.50) years, with a male to female ratio of 1∶1. The imaging findings of patients with LSCS with epilepsy were mainly manifested as multiple brain calcifications, soft tissue atrophy and skull thinning on the focal side. The results of fundus examination and fundus fluorescein angiography in patients with LSCS with Coats-like response were mainly exudative inflammation and retinal detachment, including 1 case with cerebral cerebrovascular inflammation. In terms of treatment, most of the patients with LSCS with epilepsy were treated with antiepileptic drugs, glucocorticoids combined with immunosuppressant, interleukin-6 inhibitor tozizumab, and the other 2 cases were treated with surgery. Patients with LSCS with Coats-like response were treated with intravitreal bevacizumab in combination with glucocorticoids and immunosuppressive therapy or retinal targeted photocoagulation or local laser therapy with triamcinolone. The above treatment can control the patient′s refractory epilepsy and improve the vision loss.Conclusions:The main manifestations of LSCS are en coup de sabre lesion with pigmentation on the forehead above the eyelid, accompanied by Coats-like response of the eye, epilepsy, and brain imaging abnormalities. The above clinical features may appear successively or simultaneously. In some patients, these symptoms may progress slowly, and can lead to blindness and refractory epilepsy severely. Glucocorticoids combined with immunosuppressive therapy should be given as early as possible, and intravitreal bevacizumab therapy can improve visual loss of LSCS patients.