소아 천식에서 측정기기에 따른 호기산화질소 농도의 비교
Comparison of Exhaled Nitric Oxide Analyzers in Childhood Asthma
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초록
목적:호기산화질소(exhaled nitric oxide, eNO)는 천식환자의 기도염증을 반영하는 생물학적 지표로 잘 알려져 있지만, 검사 방법과 환자의 상태에 따라서 검사 결과가 달라질 수 있다. 본 연구에서는 소아 천식 환자에서 호기산화질소 측정기기 CLD88^® (Ecomedics; Durnten, Switzerland)과 Niox mino^® (Aerocrine; Solna, Sweden)의 호기산화질소 측정치를 비교하고 그 임상적 의의를 알아보고자 하였다. 방법:세브란스 어린이병원에 내원한 천식환자 104명, 대조군 59명을 대상으로 하였으며 Niox mino^®와 CLD88^®을 이용하여 호기산화질소를 측정하고, 기관지확장제 투여 전후 폐기능검사, 메타콜린 유발시험, 유도객담검사를 시행하였다. 결과:Niox mino^®로 측정한 호기산화질소는 천식군(38.4±27.9 ppb)에서 대조군(17.2±9.0 ppb, P<0.001)에 비해 유의하게 높았고, CLD88^®을 이용한 경우에도 천식군(47.8±31.8 ppb)에서 대조군(22.2±12.7 ppb, P< 0.001)보다 높았다. 측정치는 Niox mino^®로 측정한 경우 약 9.0 ppb 낮았다. 측정치의 급내상관계수(intraclass correlation coefficient)는 0.786(P<0.001)이었다. 호기산화질소 농도는 폐기능의 지표 중 FEV_1/FVC, 유도 객담 내 호산구 비율과 유의한 상관관계를 보였으며, PC_(20) 농도와는 전체를 대상으로 분석하는 경우 유의한 상관관계를 보였으나, 천식환자만을 대상으로 분석하였을 때에는 유의한 상관관계를 보이지 않았다. 결론:호기산화질소 측정치는 Niox mino^®와 CLD88^®로 측정한 모두에서 천식군에서 대조군에 비하여 유의하게 높으므로 천식의 보조적인 진단도구로 사용될 수 있을 것으로 생각된다. 그러나 측정 기기에 따라 호기산화질소 농도의 측정치가 다를 수 있음을 유의해야 한다.
Abstract
Purpose:The measurement of exhaled nitric oxide (eNO) is a noticeable tool that reflects asthmatic airway inflammation. However, the eNO values might be variable according to the patient's condition and the method of measurement. The aim of this study was to compare the values of eNO measured by two different eNO analyzers in asthmatic children (Niox mino^® [Aerocrine; Solna, Sweden] and CLD88^® [Eco Medics; Durten, Switzerland]. Methods:One hundred four asthmatic children and 59 healthy controls were enrolled. The study participants underwent pulmonary function testing before and after inhaled bronchodilator treatment, a methacholine provocation test, and sputum induction; the eNO concentration was then measured. Results:The value of eNO measured by Niox mino^® was significantly lower than the value of eNO measured by CLD88^® (30.7±25.0 vs. 38.6±29.2 ppb, P<0.001). The intraclass correlation coefficient was 0.786 (P<0.001). The eNO concentration was significantly increased in asthmatic children than controls (38.4±27.9 vs. 17.2±9.0 ppb, P<0.001 by Niox mino^®; 47.8±31.8 vs. 22.2± 12.7 ppb, P<0.001 by CLD88^®). The eNO concentration was significantly correlated with the FEV_1/ FVC (r=-0.382, P<0.001 [Niox mino^®]; r=-0.273, P=0.001 [CLD88^®], percent sputum eosinophils (r=0.257, P=0.032 [Niox mino^®]; r=0.297, P=0.017 [CLD88^®]), and PC_(20) (r=-0.333, P<0.001 [by Niox mino^®] r=-0.240, P=0.003 [CLD88^®]). Conclusion:The measurement of eNO might be a supportive tool for the diagnosis of asthma in children; however, the eNO values differ according to analyzers.
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