Adrenal suppression (AS), a glucocorticoid (GC) side effect with potentially significant morbidity, is poorly understood. The purpose of our study was to determine frequency, duration, and predictors of AS following a gradual taper of GC in children with rheumatic conditions.
A prospective, observational cohort study was conducted. All patients ages ≤16 years ready to discontinue GC after >4 weeks of therapy were included. Morning cortisol was tested 4 weeks after GC taper to physiologic doses and then repeatedly until normalization. GCs were subsequently discontinued and a low-dose adrenocorticotropic hormone stimulation test was performed.
The study was completed by 31 of 39 patients. The median age was 12.9 years and median duration of GC therapy was 39.6 weeks. Seventeen patients (54.8%) had AS. Of the patients with AS, 50% showed recovery by 7 months. Two patients had persistent AS at 12 months and 1 patient at 2 years. A higher maximum GC dose was a significant predictor for the development of AS.
More than 50% of our patients had AS after GC discontinuation, despite a gradual taper of GC. Stress steroids should be considered in children treated with long-term GC, even after steroid discontinuation, to prevent possible adrenal crisis.