Individualized dose titration of growth hormone (GH) during GH replacement in hypopituitary adults

Clinical Endocrinology
G JohannssonB A Bengtsson

Abstract

Until now, GH treatment in GH-deficient adults has employed dose schedules of GH based on body weight or body surface area and has ignored individual responsiveness to GH. This trial has studied the effects of an individualized GH dose adjusted to match a combination of clinical response, normalization of serum IGF-I concentration and body composition. Two closely-matched groups, each comprising 30 GH-deficient adults, 38 men and 22 women aged 48 years, were treated with GH for 12 months. The high dose (HD) group received a target dose of 12 micrograms/kg per day and the individualized dose (ID) group received an initial daily GH dose of 0.17 or 0.33 mg per day (0.5 and 1 IU, respectively), independent of body weight, with dose adjustments thereafter. Serum concentrations of IGF-I, lipoprotein(a), insulin, calcium, intact PTH, osteocalcin and blood glucose were measured. Body composition was determined according to a 4-compartment model using total body potassium and tritiated water as input variables. Total body nitrogen was measured by in vivo neutron activation and total body bone mineral content by dual energy X-ray absorptiometry. At 12 months, the daily dose of GH was 0.55 +/- 0.03 mg and 0.45 +/- 0.03 mg in the HD and ID...Continue Reading

Citations

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