[Long-acting gonadotropin-releasing hormone analogue in treatment of idiopathic central precocious puberty in girls].

OBJECTIVE

To investigate the efficacy and side-effects of long-acting gonadotropin-releasing hormone analogue (GnRHa) in treatment of idiopathic central precocious puberty (ICPP) in girls.

METHODS

Thirty six ICPP girls were treated with GnRHa. The secondary sexual characteristics, uterus volume, ovary volume, follicle development, bone age/chronological age (BA/CA), predicted adult height (PAH), serum inhibitor A (INHA) and inhibitor B (INHB), body mass index (BMI) and growth rate were compared before and after treatment. Bone age was assessed using the Greulich-Pyle method, PAH was calculated by the Payley-Pinneau method, serum INHA and INHB were measured by ELISA, and serum LH and FSH were measured by chemoluminescence.

RESULT: (1) Breast development was reduced after 3 to approximately 6 months of treatment, and no continued development were observed. In 12 girls the breast development returned from Tanner II to B1. (2) Both uterus and ovary volume were decreased after 6 months [(3.28 +/-2.20)ml comrade with (1.27 +/-0.69)ml and (3.62 +/-1.94)ml compared with (1.24 +/-0.50)ml, respectively]; the follicle was reduced or even disappeared; and the serum INHA and INHB were decreased from Log(0.93 +/-0.35)ng/L and Log(1.95 +/-0.37)ng/L to Log(0.60 +/-0.32)ng/L and Log(1.46 +/-0.32)ng/L, respectively. (3) BA/CA was decreased from 1.40 +/-0.20 to 1.26 +/-0.15; PAH was increased from (149.12 +/-4.04)cm to (152.84 +/-3.72)cm after one-year treatment; BMI showed no significant changes (16.04 +/-1.68 compared with 15.93 +/-1.69).

CONCLUSION

GnRHa can effectively inhibit the development of sex gland and the secondary sexual characteristics, stabilize or delay bone maturation, improve the predicted adult height, and has no observed side-effects in the short-term treatment for ICPP girls.