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Growth hormone therapy in hypochondroplasia
U Ramaswami1, P C Hindmarsh, C G Brook
1London Centre for Paediatric Endocrinology, Middlesex Hospital, London, UK.
Acta Paediatrica (Oslo, Norway : 1992). Supplement
|April 2, 1999
Summary
Hypochondroplasia treatment varies by patient phenotype. Growth hormone (GH) therapy combined with leg-lengthening surgery can help some children achieve normal adult height. GH is typically reserved for those lacking a pubertal growth spurt.
Area of Science:
- Pediatric Endocrinology
- Genetics
- Skeletal Dysplasias
Background:
- Hypochondroplasia presents with diverse clinical features.
- Specific mutations, like Asn540Lys, are linked to severe short stature and disproportionate body segments in children.
- Growth patterns during puberty in hypochondroplasia are unpredictable.
Purpose of the Study:
- To describe the variable phenotypes of hypochondroplasia.
- To outline treatment strategies including growth hormone (GH) therapy and surgical leg-lengthening.
- To establish guidelines for initiating GH treatment based on pubertal growth response.
Main Methods:
- Clinical observation of patients with hypochondroplasia.
- Assessment of response to growth hormone (GH) therapy.
- Evaluation of outcomes with surgical leg-lengthening procedures.
- Monitoring of pubertal growth spurts.
Main Results:
- Patients with Asn540Lys mutation and severe short stature show increased spinal length with GH therapy.
- Combined GH therapy and leg-lengthening can lead to normal adult height in some individuals.
- Some children with proportionate short stature and hypochondroplasia experience a delayed or absent pubertal growth spurt, which can be restored by GH therapy.
- Predicting spontaneous pubertal growth spurts is currently not possible.
Conclusions:
- Treatment for hypochondroplasia requires individualized approaches based on phenotype.
- Growth hormone (GH) therapy is effective in improving spinal growth and can restore pubertal growth spurts.
- Surgical leg-lengthening is a viable option for achieving normal adult height in conjunction with GH therapy.
- Current practice involves monitoring all patients and initiating GH treatment only for those who do not exhibit a pubertal growth spurt, with exceptions for severe cases prior to puberty.