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  • Title: Long-acting GnRH analogue triptorelin therapy in central isosexual precocious puberty.
    Author: Bajpai A, Sharma J, Kabra M, Gupta AK, Menon PS.
    Journal: Indian Pediatr; 2002 Jul; 39(7):633-9. PubMed ID: 12147888.
    Abstract:
    OBJECTIVE: To evaluate the efficacy of long acting GnRH analogue in improving the auxological outcome of patients with central isosexual precocious puberty (CIPP) and to determine the factors influencing the response. METHODS: Thirty-five patients (30 girls, 5 boys) with CIPP were treated with a long acting GnRH analogue, triptorelin. Final height outcomes and factors affecting treatment were analyzed. RESULTS: Treatment was started at the chronological age (CA) of 6.5 1.8 years in girls and 4.4 1.5 years in boys and continued for a period of 3.7 1.8 years in girls and 6 1.8 years in boys. Follow-up period after discontinuation of treatment was 2.2 0.5 years in girls and 2.6 0.3 years in boys. Treatment led to regression of precocious puberty and reversal of secondary sexual characteristics. There was decline in growth rate reflected by a fall in heightSD of 0.8 0.8 in girls and 2.3 0.9 in boys (p = 0.014), an even greater retardation in bone age (BA) advancement with a decrease in BA-CA of 1.7 1 years in girls and 2.7 1 years in boys and a fall in heightSDBA of 1.5 1.1 in girls and 2.1 1.6 in boys. Final height (149.8 6.9 cm in girls and 161.9 3.9 cm in boys) exceeded projected height at the onset of treatment (143.4 8.3 cm in girls and 154.3 2.7 cm in boys) by 6.4 2.4 cm in girls and 7.6 1.5 cm in boys ( p < 0.001 in both the groups). Factors influencing height gain included age at start of therapy (r = 0.715), BA-CA at the time of initiation of treatment (r = 0.734), heightSDBA at the onset of treatment ( r = 0.566) and the duration of treatment (r = 0.711). Girls treated at an age of less than 6 years (n = 9) had a greater height gain (8.7 1.6 cm versus 5.3 1.9 cm, p < 0.001) and achieved similar final height (148.7 8 cm versus 150.2 6.6 cm) in those treated after this age (n = 21). No side effects of GnRH therapy were observed in the study. CONCLUSION: Long acting GnRH therapy is effective in improving the auxological outcome of patients with CIPP. Maximum benefit is observed in girls with greater bone age advancement treated at a younger age and for a longer duration of treatment. These girls had lower bone age advance at discontinuation of treatment.
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