Abstract
Most children infected by HIV show manifestations which mimic the clinical features of endocrine dysfunction, such as failure to thrive and hyperpigmentation. Our cross-sectional study was designed to assess the endocrine function of Thai children infected with HIV and to determine any relationship between disease severity, height and endocrine function. Thirty-six prepubertal children infected by HIV, 12 boys and 24 girls, aged 4-12 years (mean +/- SD 7 +/- 2 years), were tested for thyroid function (serum T4, T3, TSH and free T4), morning serum cortisol level, serum insulin-like growth factor-I (IGF-I) and IGF binding protein-3 (IGFBP-3). Disease severity was assessed using CD4+ T-lymphocyte percentage. Ten (28%) patients showed abnormal thyroid function. Five patients had euthyroid sick syndrome. Thyroid function tests indicated another five patients had a condition compatible with compensated hypothyroidism. Most patients had normal morning serum cortisol levels. Two-thirds and one-third of the patients showed low IGF-I and IGFBP-3 standard deviation scores (SDS), respectively. Twenty-six (72%) patients had CD4+ T-lymphocyte <15%, thus were classified as severely immune suppressed. A weak linear relationship was indicated between disease severity and endocrine function (r = -0.03 to 0.41). Statistical significance was found between CD4+ percentage and IGF-I SDS, IGFBP-3 SDS, serum T3 and free T4 (p-value = 0.03, 0.02, 0.02 and 0.01, respectively. Nearly half (44%) the patients were below the third percentile for height of Thai children. There was also a weak correlation between height SDS and endocrine function (r = -0.03 to 0.41). Statistical significance was observed between height SDS and IGF-I SDS, serum T3 and TSH (p-value = 0.02 and 0.01, respectively). We conclude that HIV-infected children with demonstrated growth failure and greater disease severity tend to have abnormal endocrine function, particularly disordered IGF-I levels.
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