Risk Factors for the First-Year Relapse in Children with Nephrotic Syndrome

Shin, Hye Kyoung; Kim, Ji Hee; Yoo, Kee Hwan; Hong, Young Sook; Lee, Joo Won; Kim, Soon Kyum

Abstract

PURPOSE
This study aimed to evaluate risk factors of the first year relapse in children with nephrotic syndrome(NS) without the need for biopsy.
METHODS
We reviewed, retrospectively, 78 children diagnosed with steroid responsive nephrotic syndrome between July 1997 and June 2002. Median years to follow up were 4.4 years(range: 1-5 years). We divided the patients into two groups(group I: primary responders with no relapse or with only two relapses in the first year after initial response; group II: initial steroid responders with three or more relapses within the first year). We retrospectively reviewed and compared variables - sex, onset age, serum albumin, serum cholesterol, 24 hours urinary protein, creatinine clearance(Ccr), presence of hematuria and hypertension(HTN), and days from initial attack to remission.
RESULTS
Of 78 patients(male: 61(78.2%), female: 17(21.8%), age range 1.1 years to 14 years, median 5.1+/-3.0 years), 47(60.3%) were in group I and 31(39.7%) were in group II. There were no statistically significant differences in sex, serum albumin, serum cholesterol, 24 hours urinary protein, Ccr, presence of hematuria or HTN. The median age of onset showed no statistical difference between the two groups. However, if the patients are dividing into two groups according to the age of onset of three-years, patients theree yrs old or less fit into group II, as opposed to patients older than three yrs in age(63.2% vs. 32.2%, P<0.05). The days from initial attack to remission was longer in group II(12.9+/-0.5 vs. 16.2+/-1.1, P<0.05).
CONCLUSION
We may conclude that the age of onset of three yrs old or less, and the longer time remission to initial steroid therapy, are risk factors of the first year relapse.