RESUMO
Objective The age and seasonal variation in children's serum 25-hydroxyvitamin D (25(OH) D] were analyzed retrospective and to provide some guides on clinical application.Methods The serum 25(OH) D level was detected by using enzyme-linked immunosorbent assay kit in 13 502 children that took health examination in Guangzhou Women and Children's Medical Center in February,march,September and October from 2009 to 2011.The cases were divided into five age groups.The average levels,deficiency and overdose of vitamin D (VD),were analyzed.Results The average 25(OH)D in serum was (80.81±42.39) nmol/L in 13 502 cases,(72.71 ± 33.47) nmol/L in Feb.and Mar.group,(89.91 ± 49.01) nmol/L in Sep.and Oct.group.There was statistically significant difference on serum 25 (OH)D level between seasons and between boys and girls for 6 years older groups.The serum 25 (OH) D levels significantly decreased with increasing age.There were statistically significant differences in serum 25 (OH) D levels and between the VD deficiency and the lack of number of cases in the 5 age groups of the two seasons.The number of VD deficiency was 482 cases (3.57％) whose 25 (OH) D ＜ 37.5 nmol/L,and 1850 cases (13.7％) whose 25 (OH) D ＜ 50.0 nmol/L.The VD deficiency in each age group was 8.19％,13.97％,37.72％,52.63％,57.92％ in Spring,and 2.38％,4.15％,10.36％,16.85％,27.47％ in Summer.The number of lack of VD was in 6 973 cases (51.64％);Excessive and poisoning of VD were 34 cases (0.25％) and 35 cases (0.26％).Conclusions Children had a relatively low level of VD in Guangzhou area,especially in the spring and school-age children with more severe VD deficiency.It is necessary to supplyVD timely in accordance with the age and season,and children were encouraged to spend more time outdoors.
RESUMO
Objective To investigate the early diagnostic value of serum Cystatin C in the diagnosis of acute kidney injury (AKI) in critically ill children.Methods Ninety-eight children of the severe case patients' rooms were divided into two groups:33 cases were AKI,65 cases were NAKI.Cystatin C and SCr in blood serum were detected by immunoturbidimetry and enzymic method every day.And compared serum Cystatin C,SCr concentrate and median diagnosis time between the two groups.Results Thirty-three cases in 98 cases of critically ill children occurred the AKI,65 patients without AKI.Comparing with the NAKI,the Cystatin C of AKI patients were significantly higher ((2.68 ±0.86) mg/L vs (0.76 ±0.15) mg/L) and SCr ((209.21 ± 100.53 ) μmol/L vs (77.46 ± 8.11) μmol/L),the differences were statistically significant (t =10.55,17.56,P ＜0.001) ; Cystatin C was in positive correlation with SCr (r =0.874,P ＜ 0.001) ; Median diagnosis time of AKI-Ⅰ,Ⅱ,and Ⅲ stage with Cystatin C were (3.0 ± 2.5) d,(5.0 ± 3.0) d and (9.0 ± 4.0) d,respectively,which was earlier than that of SCr ((5.0 ± 2.0) d,(7.0 ± 2.5) d and (10.0 ± 3.0) d,respectively; t =4.39,2.29,3.16,respectively ;P ＜ 0.01 or P ＜ 0.05).Conclusion In the process of AKI,the level of serum Cystatin C elevated significantly earlier than SCr,so it could as be one of the early dynamic criteria in the critically ill children.