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2017 ; 4
(ä): 2054358117709496
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Glomerular Filtration Rate Trends During Follow-up in Children With
Steroid-Sensitive Nephrotic Syndrome
#MMPMID28607687
Alsaidi S
; Wagner D
; Grisaru S
; Midgley J
; Hamiwka L
; Wade A
; Nettel-Aguirre A
; Samuel S
Can J Kidney Health Dis
2017[]; 4
(ä): 2054358117709496
PMID28607687
show ga
BACKGROUND: Overall prognosis of children with steroid-sensitive nephrotic
syndrome (SSNS) is regarded as generally favorable. However, only a few recent
studies have evaluated changes in kidney function and blood pressure over time in
children with SSNS. OBJECTIVES: We describe clinical features of SSNS patients
and characterize changes in calculated estimated glomerular filtration rate
(eGFR) and use of antihypertensive medications during follow-up. DESIGN: This is
a retrospective cohort study. SETTING: This study was conducted in a Canadian
pediatric nephrology center. PATIENTS: This study included patients aged 1 to 18
years with SSNS. MEASUREMENTS: eGFR was calculated from recorded serum creatinine
and height measurements using the modified Schwartz equation. METHODS: eGFR was
calculated at yearly intervals, and the trend of eGFR was assessed using linear
mixed effects model. Patients were also evaluated for use of antihypertensive
medications during follow-up. RESULTS: Seventy-eight patients-median age, 3.2
years (interquartile range [IQR], 2.65) and median follow-up of 4.37 (IQR,
5.6)-were evaluated. Sixty-three (80.8%) had at least 1 relapse. Twenty-two
(28.2%) and 20 (25.6%) were steroid dependent and frequently relapsing,
respectively. Forty-three patients (55.1%) received at least 1 steroid-sparing
agent, and of these, 18 (41.8%) received a calcineurin inhibitor. One patient had
eGFR ?90 mL/min/1.73 m(2) during observation. eGFR remained unchanged over the
follow-up period in this cohort of patients. Four patients (5.1%) were on
antihypertensive medications at the end of follow-up. LIMITATIONS: Patients who
had frequent relapses had more measurements available for serum creatinine and
height, creating a sampling bias. The number of eGFR measurements was overall
small, making it difficult to ascertain eGFR trend. CONCLUSION: eGFR remained
unchanged over time in this cohort, and a small proportion of patients required
antihypertensive therapy at the end of follow-up. Our study highlights the needs
for carefully constructed long-term observational studies of children with
nephrotic syndrome.