Management of altered hydrocortisone pharmacokinetics in a boy with congenital adrenal hyperplasia using a continuous subcutaneous hydrocortisone infusion.
BACKGROUND
Conventional hydrocortisone dosing schedules do not mimic the normal circadian rhythm of cortisol, making it difficult to optimize treatment in congenital adrenal hyperplasia (CAH).


METHODS
We report a 14.5-year-old boy with CAH who had reduced bioavailability [42% (normal 80% orally and 100% by im route)] and increased clearance [half-life 50 min (normal range, 70-100 min)] of oral doses of hydrocortisone leading to ambient serum 17-hydroxyprogesterone concentrations of 400 nmol/liter (14.5 ng/ml) and androstenedione concentrations of 24.9 nmol/liter (7.1 ng/ml).


METHODS
Using a continuous but variable sc hydrocortisone infusion via an insulin pump, rapid control of his CAH was attained with a normal cortisol circadian profile. Average daily hydrocortisone dose was 17.4-18.6 mg/m(2), which produces on average 24-h serum cortisol and 17-hydroxyprogesterone concentrations of 316 nmol/liter (115 ng/ml) and 4.3 nmol/liter (1.4 ng/ml), respectively. Therapy has been maintained over 4 yr with suppression of normal adrenal androgen production and normal progression through puberty.


CONCLUSIONS
Continuous sc infusion of hydrocortisone may prove a valuable adjunct to therapy for CAH, particularly in patients requiring high doses of oral hydrocortisone and in those with abnormal hydrocortisone pharmacokinetics.
Bryan
Sinead M
SM
Developmental Endocrinology Research Group, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, United Kingdom.
Honour
John W
JW
Hindmarsh
Peter C
PC
D019326:17-alpha-Hydroxyprogesterone / Q000097:blood; D000293:Adolescent; D000312:Adrenal Hyperplasia, Congenital / Q000378:metabolism*; D006801:Humans; D006854:Hydrocortisone / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics*; D055104:Infusions, Subcutaneous; D008297:Male
D019326:17-alpha-Hydroxyprogesterone; D006854:Hydrocortisone