Accelerated growth rates in children treated with growth hormone after renal transplantation

To determine the usefulness of growth hormone treatment among children with renal allografts, we treated nine children with functioning renal transplants who were<16 years of age and had poor growth. The nine children, who were aged 12.6±4.0 years, had (1) heights >2.5 SD less than the mean for age, (2) growth rates ≤5 cm/yr, and (3) additional growth potential, as assessed by bone age (8.9±2.8 year). Insulin-like growth factor I, thyrotropin, and thyroid hormone levels were normal for age in all children. Growth hormone treatment increased growth rates from 1.9±1.1 cm/yr to 7.2±1.8 cm/yr without accelerating skeletal maturation and without advancing pubertal status. During growth hormone treatment, serum creatinine concentration rose from 140±50 to 190±80 μmol/L (1.6±0.6 to 2.1±0.9 mg/dl) (p<0.05), and creatinine clearances decreased from 0.79±0.37 to 0.58±0.30 ml/sec per 1.73 m² (47±22 to 35±18 ml/min per 1.73 m²) (p<0.05) but then remained stable. Growth rates of two patients returned to pretreatment rates when growth hormone treatment was discontinued after 5 and 7 months because of increased serum creatinine values. Growth hormone treatment may be useful as adjunctive therapy for increasing growth rates in selected children with renal allografts who have poor growth; however, serum creatinine concentrations should be closely monitored during such treatment.