특발성 진성 성조숙증 여아에서 생식샘자극호르몬방출호르몬 작용제 치료 중 성장속도에 영향을 주는 인자
Factors Affecting Growth Velocity during Gonadotropin- Releasing Hormone Agonist Treatment in Girls with Idiopathic Central Precocious Puberty
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목적: GnRHa 치료를 받는 진성 성조숙증 여아들의 일부에서 성장속도가 해당 연령 정상 범위 미만으로 감소되는 것이 관찰된다. 본 연구를 통하여 저자들은 GnRHa 치료 중 성장속도 변화와 관련된 임상 인자 및 검사실 인자들을 확인하고자 하였다. 방법: 특발성 진성 성조숙증으로 진단되어 GnRHa 치료를 받은 49명의 여아(역연령 7.8±0.5세)를 연구 대상으로 하였다. 대상 여아들의 성장속도, 키 SDS, 호르몬 측정치, 사춘기 단계, 연역령 및 골연령을 분석하였다. 결과: 치료 첫 번째 해의 성장속도는 5.9±1.0 cm/yr이었고, 치료 두 번째 해의 성장속도는 5.4±1.1 cm/yr로 치료첫 해에 비해 유의하게 감소하였다(P =0.005). 치료 세 번째 해의 성장속도는 5.0±1.0 cm/yr로 두 번째 해의 성장속도와 차이를 보이지 않았다. 치료 두 번째 해의 성장속도가 4 cm/yr 미만인 환아는 4명(8.2%), 5 cm/yr 미만인 환아는18명(36.7%)이었다. 치료 두 번째 해의 성장속도가 5 cm/yr 미만인 여아 가운데 골연령이 11세 이상인 환아의 비율은55.6%로서 성장속도가 5 cm/yr 이상인 여아 가운데 골연령이 11세 이상인 환아의 비율 19.4%보다 유의하게 높았다(OR, 5.2; P =0.022). 치료 두 번째 해의 상대적인 성장속도 저하(<5 cm/yr)에 대한 다변량 로지스틱 회귀분석 결과,치료 1년 후 골연령이 양의 연관성(OR, 6.13; 95% CI, 1.57-23.87)을, 치료 1년 후 골연령 기준 키 SDS가 음의 연관성(OR, 0.24; 95% CI, 0.06-0.94)을 보였다. 결론: 본 연구의 결과는 특발성 진성 성조숙증 여아들은 GnRHa 치료 후 두 번째 해부터 유의한 성장속도 감소를 보이지만 이 성장속도는 사춘기 전 정상 성장속도 범위 안에 있으며, 상대적으로 더 낮은 성장속도와 관련된 인자는 진행된골연령과 낮은 골연령 기준 키 SDS임을 시사한다.
Abstract
Purpose: In some girls with central precocious puberty (CPP), growth velocity (GV)decreases below the age-appropriate normal range during gonadotropin-releasing hormone agonist (GnRHa) treatment. The purpose of this study was to investigate clinical and laboratory factors related to changes in GV during GnRHa treatment in girls with CPP. Methods: We analyzed clinical and laboratory data of 49 girls (aged 7.8±0.5 years)with idiopathic CPP who were treated with GnRHa. GV, height standard deviation score (SDS), hormonal parameters, pubertal stage, chronological age and bone age (BA) were evaluated. Results: GV during the first year of GnRHa treatment was 5.9±1.0 cm/yr and decreased significantly to 5.4±1.1 cm/yr during the second year of treatment (P = 0.005). GV during the third year (5.0±1.0 cm/yr) was not different from GV during the second year. During the second year of treatment, 8.2% and 36.7% of the girls had a GV < 4cm/yr and < 5 cm/yr, respectively. Girls with relatively low GV during the second year of treatment (< 5 cm/yr) showed higher risk of advanced BA (≥ 11 yr) at 1 year (55.6% vs. 19.4%; odds ratio [OR], 5.2; P = 0.022). In multivariate logistic regression analysis, more advanced BA at 1 year (OR, 6.1; 95% confidence interval [CI], 1.57-23.87) and lower height SDS for BA at 1 year (OR, 0.24; 95% CI, 0.06-0.94) were associated with relatively decreased GV (< 5 cm/yr) during the second year of GnRHa treatment. Conclusion: GV during and after the second year of GnRHa treatment in girls with idiopathic CPP remains within the normal prepubertal range, and relatively low GV during GnRHa treatment is associated with more advanced BA and lower height SDS for BA.
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