Effect of intranasal triamcinolone acetonide on basal hypothalamic-pituitary-adrenal axis function in children with allergic rhinitis.

: Intranasal corticosteroids are the most effective medication class for controlling allergic rhinitis (AR) symptoms. However, limited data are available on their effects on basal hypothalamic-pituitary-adrenal (HPA) axis function in children. This study was designed to determine the effect of 6-week triamcinolone acetonide aqueous (TAA-AQ) nasal spray treatment on HPA axis function by measuring 24-hour serum cortisol area under the curve (AUC(0-24h)) in children with AR aged 2-11 years. This phase 4, multicenter, double-blind, placebo-controlled, parallel-group study randomized children with AR to receive TAA-AQ (110 μg, 2-11 years old, or 220 μg, 6-11 years old) or placebo. At pre- and posttreatment domiciled visits, 24-hour serum cortisol and reflective total nasal symptom scores (rTNSSs) were assessed. Safety assessment included treatment-emergent adverse events (TEAEs) at each visit and trough levels of 24-hour serum cortisol. A total of 140 subjects (mean age, 7.2 years; males, 59%) were randomized; 66 from each group completed treatment. The ratio of TAA-AQ to placebo for change from baseline in serum cortisol AUC(0-24h) was 0.966 (95% confidence interval, 0.892-1.045). Reduction from baseline in mean rTNSS was significantly greater in the TAA-AQ than in the placebo group (difference: least square mean ± SE = -0.85 ± 0.24; p = 0.0007). The safety profile was similar (TEAEs, TAA-AQ, 27.5%; placebo, 25.4%), and so was the mean change in serum cortisol trough level (TAA-AQ, -0.4 μg/dL; placebo, -0.1 μg/dL; p = 0.1818 for treatment difference) from pre- to posttreatment. TAA-AQ was safe, well tolerated, and not associated with clinically meaningful suppression of serum cortisol AUC(0-24h) in children with AR. Clinical trial NCT01154153, www.clinicaltrials.gov.