Effect of long-term glucocorticoid therapy on bone mineral density of the patients with congenital adrenal hyperplasia

Abstract

Background and objectives. Congenital adrenal hyperplasia (CAH) is characterized by androgen excess which should be treated with life-long glucocorticoid therapy, thus can affect bone mineralization. We aimed to evaluate the bone mineral density (BMD) and determine the factors affecting bone mineralization in patients with CAH.Method. This prospective case-control study was conducted in children, adolescents and young adults with classical 21-hydroxylase CAH, and age-, sex-, and pubertal stage matched healthy controls. Lumbar1-4 BMD was determined by dual-energy X-ray absorptiometry. BMD z-score was calculated using national standards with respect to height age and was referred as “low BMD” if z-score < 0.001. Number of patients with low BMD was similar in both groups; [CAH: 6(16.2%), control: 5(13.5%); p= 0.744]. BMI-z-score was higher in patients with CAH when compared to control group; p= < 0.001. BMI z-score was lower in low BMD group as comparison to normal BMD group; p= 0.041. Each 1.0 decrease in BMI z-score, risk of having low BMD was found to increase by 1.79 (%95 CI: 1.03-3.12, p= 0.040). BMI-z-score, average serum 17-hydroxyprogesterone level, duration of treatment, average and cumulative glucocorticoid doses were not found to be correlated with BMD z-score.Conclusion. Long-term glucocorticoid therapy did not have negative effect on BMD of patients with CAH. Higher BMI z-score in patients with CAH may have a positive effect on preserving bone health. Precautions should be taken for increased risk of obesity.