Growth of children with beta-thalassemia major.
Hypertransfusion and regular chelation therapy have allowed improved survival in patients with thalassemia major (TM). Despite medical advances, growth failure and hypogonadism remain significant clinical problems in these patients in adolescence. Disproportionate truncal shortening which is common especially among adolescents with thalassemia, is due to platyspondyly resulting from a combination of factors like hemosiderosis, desferrioxamine toxicity or deficiency of trace elements. Although growth hormone (GH) deficiency and GH neurosecretory dysfunction have been described in TM patients, most short TM patients have normal GH reserve. The low serum IGF-1 and IGFBP-3 concentrations in TM patients despite having normal GH reserve and serum GH binding protein levels suggest that a state of secondary GH insensitivity exists. The pubertal growth spurt may be impaired in TM patients going through spontaneous or induced puberty and may have a negative effect on final adult height. GH therapy in dosages ranging from 0.5-1.0 IU/kg/wk has resulted in a significant improvement in growth velocity in short TM children without any adverse effects on skeletal maturation, blood pressure, glucose tolerance and serum lipids. There is limited evidence that GH treatment can result in an improved final adult height in short TM children. Careful and regular clinical and biochemical monitoring should be preformed on these patients while they are treated with GH.
Low
Louis Ck
LC
Department of Pediatrics and Adolescent Medicine, The University of Hong Kong, Queen Mary Hospital, Pokfulam Road, Hong Kong SAR, PR China. lcklow@hkucc.hku.hk
D000293:Adolescent; D001827:Body Height; D002648:Child; D005260:Female; D006128:Growth; D006130:Growth Disorders / Q000188:drug therapy / Q000209:etiology*; D013007:Growth Hormone-Releasing Hormone / Q000378:metabolism; D019382:Human Growth Hormone / Q000378:metabolism / Q000627:therapeutic use*; D006801:Humans; D007006:Hypogonadism / Q000209:etiology; D007334:Insulin-Like Growth Factor I / Q000378:metabolism; D008297:Male; D017086:beta-Thalassemia / Q000150:complications* / Q000503:physiopathology
D019382:Human Growth Hormone; D007334:Insulin-Like Growth Factor I; D013007:Growth Hormone-Releasing Hormone