Clinical and Experimental Pediatrics

The Korean Pediatric Society (대한소아청소년과학회)
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Spectrum of patients with hypermethioninemia based on neonatal screening tests over 14 years

14년간 신생아 선별검사에서 고메티오닌혈증으로 전원된 환아들의 임상적 고찰

  • Oh, Se Jung (Department of Pediatrics, College of Medicine, Soonchunhyang University) ;
  • Hong, Yong Hee (Department of Pediatrics, College of Medicine, Soonchunhyang University) ;
  • Lee, Yong Wha (Department of Laboratory Medicine & Genetics, Soonchunhyang University Bucheon Hospital and Soonchunhyang University College of Medicine) ;
  • Lee, Dong Hwan (Department of Pediatrics, College of Medicine, Soonchunhyang University)
  • 오세정 (순천향대학교 의과대학 소아과학교실) ;
  • 홍용희 (순천향대학교 의과대학 소아과학교실) ;
  • 이용화 (순천향대학교 부천병원 진단검사의학과) ;
  • 이동환 (순천향대학교 의과대학 소아과학교실)
  • Received : 2010.01.04
  • Accepted : 2010.02.15
  • Published : 2010.03.15
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Abstract

Purpose : The neonatal screening test for homocystinuria primarily measures methionine by using a dried blood specimen. We investigated the incidence and clinical manifestations of homocystinuria, isolated hypermethioninemia, and transient hypermethioninemia among patients with hypermethioninemia on a neonatal screening test. Methods : We performed a retrospective study of 58 patients transferred to Shoonchunhyang Hospital because of hypermethioninemia on a neonatal screening test between January 1996 and August 2009. We analyzed the level of amino acid from plasma and urine, as well as blood homocysteine.Results : Almost half of the 58 patients were identified as normal. Whereas only 3 (5.1%) patients were identified as having homocystinuria, about 20.7% (12 cases) of the patients had isolated hypermethioninemia. The ages of these two groups at initial detection of hypermethioninemia on plasma amino acid analysis were $50.0{\pm}22.5$ days and $34.9{\pm}13.5$ days, respectively. Both groups were put on diets, and they showed a normal developmental course as a result of early diagnosis and treatment. Conclusion : Hypermethioninemia without homocystinuria, referred to as isolated hypermethioninemia, was also detected. Thus, the impact of hypermethioninemia on a neonatal screening test should be carefully evaluated through analysis of amino acid levels from blood and urine, and we need to detect and treat an early stage of isolated hypermethioninemia as well as homocystinuria.

목 적 : 신생아 선별검사에서 고메티오닌혈증 소견을 보여 전원된 환아들의 혈액 및 소변 아미노산 분석과 호모시스테인 검사 결과를 통해 호모시스틴뇨증, 단독성 고메티오닌혈증, 일과성 고메티오닌혈증의 빈도를 알아보고 이들의 임상 양상에 대해 분석하고자 하였다. 방 법 : 1996년 1월부터 2009년 8월까지 신생아 선별검사상 고메티오닌혈증 또는 호모시스틴뇨증 의심 하에 본원으로 의뢰된 환아 58명을 대상으로 하였다. 각 환아의 입원 또는 외래 내원기록을 후향적으로 검토하여 혈액 및 소변 아미노산 분석 검사 결과, 혈장 호모시스테인(Homocysteine) 측정 결과 등을 조사하였다. 결 과 : 정밀검사 결과 분석을 통해 진단 기준에 따라 대상 환아 총 58명에서 28명(48.3%)가 정상으로 판명되었고 12명(20.7%)는 일과성으로 판명되었다. 호모시스틴뇨증과 단독성 고메티오닌혈증 환아들은 각각 3명(5.1%), 15명(25.9%)이었고 첫 내원시 평균 연령이 각 $50.0{\pm}22.5$일, $34.9{\pm}13.5$일이었으며 특수 분유와 식사 요법을 이용한 조기 치료 이후 현재까지 모두 정상 발달을 유지하고 있다. 결 론 : 신생아 선별검사에서 고메티오닌혈증을 보이는 경우 혈액과 소변 아미노산 분석을 시행함으로써, 치료하지 않을 경우 영구적인 기능 저하 및 발육 부진을 초래할 수 있는 호모시스틴뇨증 뿐만 아니라 비교적 양성 질환인 단독성 고메티오닌혈증을 진단할 수 있고 이러한 조기 진단과 치료를 통해 각 질환 환아의 정상적인 성장이 이루어질 수 있다는 점을 염두하여 이들의 조기 진단 및 추적 관찰을 시행해야 하겠다.

Keywords

References

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