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Slowing of growth in height and weight on stimulants: a characteristic pattern
1Department of Paediatrics, Nepean Hospital, Penrith, New South Wales, Australia. tbraj@bigpond.net.au
Insights
Children on stimulant medication for attention-deficit/hyperactivity disorder experienced decreased height and weight velocity, particularly in the first six months. This growth pattern requires monitoring during treatment.
Area of Science:
- Pediatric Endocrinology
- Neurodevelopmental Disorders
- Pharmacology
Background:
- Attention-deficit/hyperactivity disorder (ADHD) is commonly treated with stimulant medications.
- The impact of these medications on pediatric growth patterns requires careful evaluation.
Purpose of the Study:
- To describe the growth patterns of children initiating stimulant medication.
- To analyze changes in height, weight, and height velocity over time in treated ADHD patients.
Main Methods:
- Retrospective review of growth data from a pediatric practice.
- Analysis of data from 51 children (44 boys, 7 girls) treated with dexamphetamine or methylphenidate for 6-42 months.
Main Results:
- 86% of children showed below-average height velocity in the first 6 months; 76% experienced weight loss.
- A statistically significant progressive decline in height and weight standard deviation scores (SDS) was observed after 6 and 18 months.
- Height velocity was significantly attenuated for up to 30 months, with the most pronounced effect in the initial 6 months.
Conclusions:
- Stimulant medication is associated with a decrease in height and weight SDS.
- This effect is evident within the first 6-30 months of treatment.
- A characteristic pattern emerges on growth charts for children receiving stimulant therapy.
Objective:
The aims of the present study were to describe the growth pattern of children starting stimulant medication and to analyse the changes over time in height, weight and height velocity in a cohort of treated patients.
Methods:
Retrospective review of growth data from files of all newly treated patients with attention-deficit/hyperactivity disorder in one paediatric practice. Forty-four boys and seven girls were treated for 6-42 months with either dexam-phetamine (n = 32) or methylphenidate (n = 19).
Results:
During the first 6 months on stimulant medication 44 children (86%) had a height velocity below the age-corrected mean and there was weight loss in 39 (76%). The height and weight standard deviation score (SDS) showed a progressive decline that was statistically significant after 6 and 18 months (P < 0.001, paired t-test). The height velocity was significantly attenuated for the first 30 months (P < 0.01), being lowest during the first 6 months. The mean height deficit during the first 2 years was approximately 1 cm/year. The change in weight SDS was 2.4 times the change in height SDS after 30 months on treatment with a significant correlation (Pearson's correlation coefficient r = 0.88, P < 0.001).
Conclusions:
Stimulant medication is associated with a decrease in height and weight SDS during the first 6-30 months with a characteristic pattern on the growth chart.
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