Laboratory tests and intervention of early renal damage in children with Henoch-Schonlein purpura / 中国小儿急救医学

ABSTRACT

Objective To investigate the efficacy of laboratory tests in the renal damage early diagnosis of children with Henoch-Schoalein purpura (HSP) and clinical effect of early intervention.Methods For the 143 HSP patients with normal repeated urine routine test findings,renal function biomarkers including urinary proteins ( immunoglobulin G (IgG),micro-albumin ( MA ),transferrin (TRF),a1 -microglobulin ( α1 -MG),β2-Microglobulin (β2-MG) ) and urinary enzymes ( N-acetyl-beta-D-glucosaminidase ( NAG ),γ-glutamyltransferase (y-GT) ) were detected to investigate the details of renal function changes.One hundred and thirty-one HSP patients,who had abnormal laboratory test findings of renal function biomarkers mentioned above,were randomly divided into control group ( n =65 ) and intervention group ( n =66 ),and both groups received comprehensive treatment including cimetidine,loratadine and calcium agents.However,66 patients in intervention group received low-dose heparin via micropump-based continuous intravenous infusion and regular oral diammonium glycyrrhizinate treatment.Sixty-five patients were enrolled in control group,without further treatment.Results Among the 143 patients with normal urine routine examination,131 cases (91.61％ ) had abnormal findings of renal function biomarkers.After therapy either for 2 months or 4 months,urine protein and urine enzymes were lower than before treatment,and the difference was significant (P ＜ 0.01 ).In the control group only β2-MG,NAG,γ-GT3 indexes significantly lowered at the end of 2 months ( P ＜0.01 ),and all parameters were significantly decreased at the end of 4 months ( P ＜0.01 ).Furthermore,Intervention group had lower levels of renal function biomarkers at the end of 2 months or 4 months,as compared with the control group,showing significant difference ( P ＜0.05 or P ＜0.01 ).Urinary IgG,MA,TRF,NAG recovered rapidly in the intervention group after 4 months and almost returned to the normal,but urinary α1-MG,β2-MG,γ-GT recovered slowly and still remained abnormal after 4 months due to the varying severity.After treatment for 4 months,the rate of urine testing abnormalities was higher in the control group than in the intervention group (36.92％ vs 6.10％ ),and the difference was significant (P ＜0.05).Conclusion Combined detection of renal function biomarkers is helpful for early diagnosis of renal damage in HSP patients.Early intervention with heparin and diammonium glycyrrhizinate can prevent kidney damage,delay disease progress.Early diagnosis and early intervention should be emphasized for the treatment strategy of the renal damage of children with HSP.