Clinical and Experimental Pediatrics

The Korean Pediatric Society (대한소아청소년과학회)
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Perinatal Factors Affecting Thyroid Stimulating Hormone(TSH) and Thyroid Hormone Levels in Cord Blood

제대혈 갑상선 자극호르몬과 갑상선 호르몬 농도에 영향을 주는 주산기 인자들

  • Kim, Eun Young (Department of Pediatrics, College of Medicine, Chosun University) ;
  • Park, Sang Kee (Department of Pediatrics, College of Medicine, Chosun University) ;
  • Song, Chang Hun (Department of Obstetrics and Gynecology, College of Medicine, Chosun University) ;
  • LIm, Sung-Chul (Department of Pathology, College of Medicine, Chosun University)
  • 김은영 (조선대학교 의과대학 소아과학교실) ;
  • 박상기 (조선대학교 의과대학 소아과학교실) ;
  • 송창훈 (조선대학교 의과대학 산부인과학교실) ;
  • 임성철 (조선대학교 의과대학 병리학교실)
  • Received : 2004.12.16
  • Accepted : 2005.01.06
  • Published : 2005.02.15
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Abstract

Purpose : The aim of the this study was to evaluate the effect of various perinatal conditions on TSH and thyroid hormone levels in cord blood. Methods : Cord blood samples were collected from 130 neonates immediately after birth. TSH, $T_3$, and free $T_4$ levels were measured by the radioimmunoassay(RIA) method. The effects of gestational age, sex, birth weight, delivery method, perinatal asphyxia, maternal diabetes mellitus(DM), and preeclampsia on TSH and thyroid hormone levels were assessed by ANOVA test, Student t-test, and multiple regression analysis. Results : Birth weight and sex did not affect TSH and thyroid hormone levels. TSH level increased according to gestational age(P<0.05). TSH level was $4.42{\pm}0.66{\mu}IU/mL$ in infants born vaginally, which was higher than that of cesarian section delivery($3.31{\pm}0.33{\mu}IU/mL$)(P<0.05). TSH level was $5.18{\pm}0.93{\mu}IU/mL$ in asphyxiated newborns and $2.97{\pm}0.84{\mu}IU/mL$ in non-asphyxiated newborns(P<0.05). TSH level in infants with maternal DM($8.911{\pm}1.25{\mu}IU/mL$) was higher than that of infants without maternal DM($4.32{\pm}0.42{\mu}IU/mL$)(P<0.05). TSH level was $5.28{\pm}0.42{\mu}IU/mL$ in infants with maternal preeclampsia and $3.65{\pm}0.46{\mu}IU/mL$ in infants without maternal preeclampsia(P<0.05). Thyroid hormones were lower in infants with perinatal asphyxia(P<0.05). In asphyxiated infants, $T_3$ level was $75.33{\pm}55.65ng/mL$ and free $T_4$ was $0.54{\pm}0.21ng/mL$. $T_3$ and free $T_4$ level was $109.85{\pm}41.77ng/mL$ and $0.76{\pm}0.22ng/mL$ each in infants without perinatal asphyxia. Among the perinatal factors, gestational age, 1 min Apgar score and maternal DM influenced TSH level independently. Conclusion : In our study, cord blood TSH and thyroid hormone levels were affected by perinatal stress events.

목 적 : 갑상선 기능은 여러 질환이나 스트레스에 의해서 영향을 받는 것으로 알려져 있다. 저자들은 분만 전과 분만 동안의 여러 인자와 제대혈 갑상선자극호르몬 및 갑상선호르몬 농도와의 상관관계를 알아보고자 본 연구를 시행하였다. 방 법 : 총 130명의 신생아를 대상으로 분만 즉시 제대혈을 10 mL 채취하여 갑상선자극호르몬, $T_3$와 유리 $T_4$ 농도를 방사면역학적 방법(CIS bio international kit, Germany)으로 측정하였다. 재태연령, 출생체중, 가사, 분만방식, 산모의 당뇨병 유무, 산모의 전자간증 유무 등에 따라 갑상선자극호르몬과 갑상선 호르몬 농도를 비교하였다. 결 과 : 1) 제대혈 갑상선자극호르몬 농도는 재태연령 34주 이하 $1.73{\pm}0.48{\mu}IU/mL$, 34주-37주 $2.60{\pm}0.51{\mu}IU/mL$, 38주 이상 $4.26{\pm}0.40{\mu}IU/mL$으로 재태연령의 증가에 따라 증가하였다(P<0.05). 2) 분만형태를 비교하면 질식 분만 군 $4.42{\pm}0.66{\mu}IU/mL$, 제왕절개 분만 군 $3.31{\pm}0.33{\mu}IU/mL$로 질식 분만 군에서 높았다(P<0.05). 3) 가사에 따른 갑상선자극호르몬 농도는 가사가 있는 군 $5.18{\pm}0.93{\mu}IU/mL$로 가사가 없는 군 $2.97{\pm}0.84{\mu}IU/mL$에 비해 유의하게 높았다(P<0.05). 4) 산모의 당뇨병에 따른 갑상선자극호르몬 농도는 당뇨병 군 $8.91{\pm}1.25{\mu}IU/mL$, 없는 군 $4.32{\pm}0.42{\mu}IU/mL$으로 산모 당뇨병 동반시 유의하게 높았다(P<0.05). 5) 산모에게 전자간증이 있는 군의 갑상선자극호르몬 농도는 $5.28{\pm}0.42{\mu}IU/mL$, 없는 군 $3.65{\pm}0.46{\mu}IU/mL$에 비해 유의하게 높았다(P<0.05). 6) $T_3$와 유리 $T_4$ 농도는 가사 군에서 없는 군보다 유의하게 낮았다(P<0.05). 7) 각 변수 간의 영향을 배제하였을때 임신주수, 1분 Apgar 점수, 산모의 당뇨병만이 독립적으로 제대혈의 갑상선자극호르몬 농도에 영향을 미치는 것으로 나타났다. 결 론 : 제대혈 갑상선자극호르몬 및 갑상선호르몬 농도는 산모의 당뇨병이나 산모 전자간증과 같은 분만 전 요인과 태아에게 저산소증을 초래할 수 있는 분만시 스트레스와 밀접한 연관이 있다.

Keywords

Acknowledgement

Supported by : 조선대학교

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