Predictors of frequent relapsing and steroid-dependent nephrotic syndrome in children.

Aim: To determine the predictors of frequent relapses and steroid dependency in children with steroid-sensitive nephrotic syndrome.

Material and Methods: All children aged six months to 18 years with steroid-sensitive nephrotic syndrome registered in the nephrology clinic between 2003 and 2015 at a tertiary center who were followed up for at least 1year after onset were included in the study.

Results: Two hundred seventy-seven patients with steroid-sensitive nephrotic syndrome who were followed up for at least 1 year from onset of disease were included. There were 157 infrequent relapsers and 120 frequent relapsers (frequent relapses and or steroid-dependent). Compared with infrequent relapsers, frequent relapsers had a significantly lower age at onset (51.53±40.42 vs. 61.97±40.66 months; p=0.035), lesser time for first relapse (time from the start of initial treatment to first relapse (8.65±11.99 vs. 23.46±24.05 months; p<0.001) and a higher number of relapses with infection (8.65±11.99 vs. 1.25±1.85; p<0.001). On multivariate logistic regression analysis, time for first relapse less than six months [OR: 3.93; 95% CI: (1.97-7.82)] and concomitant infection during relapses [OR: 1.82; 95% CI:(1.56-2.14)] were significant predictors of frequent relapses, and males were less likely to become frequent relapsers [OR: 0.48; 95% CI:(0.24-0.93)]. Kaplan-Meier analysis and the log-rank test also showed that a first relapse within six months was associated with frequent relapses. Age at onset and inadequate steroid therapy at onset did not determine frequent relapses.

Conclusion: Shorter time for first relapse and concomitant infection during relapses can predict future frequent relapses. These predictors may be useful to counsel patients, to follow them up more closely, and to develop better treatment protocols and relapse-specific interventions.