조산아에서 발생하는 부신기능부전과 연관된 저혈압의 임상상
Clinical Picture of Adrenal Insufficiency-associated Hypotension in Preterm Infants
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목적: 본 연구에서는 부신기능부전과 연관된 저혈압의 임상적 특성과 hydrocortisone 투여에 대한 치료반응을 알아보고자 하였다. 방법: 2007년 1월 1일부터 2009년 8월 31일까지 분당서울대학교병원에서 출생하여 신생아집중치료실에 입원했던 재태주령 32주 미만의 미숙아 158명 중 미숙아 부신기능부전과 연관된 저혈압이 발생하였던 12명의 환아를 대상으로 하였고 이들의 임상적 특성과 hydrocortisone 투여 전과 후의 평균혈압, 소변량, 혈청 전해질 검사 소견을 비교하였다. 결과: 환아의 재태주령은 27.8±2.5주, 출생체중은 1,110±307g이었고 부신기능부전과 연관된 저혈압이 발생한 시기는 생후19±7일, 월경 후 주령으로는 30.6±2.4주이었고 당시 체중은1,285±365 g이었다. Dopamine 투여에도 저혈압이 발생한 미숙아는 hydrocortisone을 4.0 mg/kg/day의 스트레스 용량으로 시작해 2.2±0.7일간 유지 후 감량하였으며 hydrocortisone 투여 전의 혈청 cortisol 농도는 11.6±4.1 mg/dL이었다. Hydrocortisone 투여 당시와 2, 4, 6시간 후의 평균혈압은 25.0±5.4 mmHg에서 35.0±5.3 mmHg, 38.3±8.0 mmHg 그리고41.9±6.5 mmHg 로 증가되다가 그 후로는 안정적으로 유지되었고 소변량도 hydrocortisone 투여 전에 0.9±0.6 mL/kg/hr 에서 치료 6시간 후 4.1±3.4 mL/kg/hr로 증가되었다. 치료시작당시와 12시간 후의 dopamine 용량은 11.0±2.9 μg/kg/min 에서 8.0±2.3 μg/kg/min로 감량되었고 24시간 후에는 5.5±3.4 μg/kg/min까지 감량되었다. 혈청 Na+ 농도는 hydrocortisone hydrocortisone 투여 전 130±4 mEq/L에서 투여 12시간 후 136±4mEq/L로 증가되었고 혈청 K+ 농도는 hydrocortisone 투여 전6.1±1.1 mEq/L에서 투여 12시간 후 4.6±0.6 mEq/L로 감소하였다. 결론: 미숙아에서 부신기능부전과 연관된 저혈압이 발생한경우 hydrocortisone의 투여는 신속히 혈압을 상승시키고 소변량을 증가시켰으며 전해질 농도를 정상화시켰다.
Abstract
Purpose: This study aims to describe the clinical characteristics of adrenal insufficiency-associated hypotension in preterm infants and the effects of hydrocortisone therapy on their cardiovascular system and serum electrolytes. Methods: Twelve preterm infants less than 32 gestational weeks admitted to neonatal intensive care unit (NICU) of the Seoul National University Bundang Hospital from January 2007 to August 2009 with clinical and laboratory findings suggestive of adrenal insufficiency were analyzed retrospectively. Results: Gestational age was 27.8±2.5 weeks and birth weight was 1,110±307 g. Postnatal age, postmenstrual age, weight at the onset of adrenal insufficiency-associated hypotension were 19±7 day, 30.6±2.4 weeks, 1,285±365 g. In preterm infants who showed vasopressor resistance, intravenous hydrocortisone was started with a stress dose of 4 mg/kg/day, maintained for 2.2±0.7days, and then tapered. Serum cortisol concentration before hydrocortisone administration was 11.6±4.1 mg/dL. Mean blood pressure increased from 25.0±5.4 mmHg to 35.0±5.3 mmHg, 38.3±8.0 mmHg and 41.9±6.5 mmHg at time of hydrocortisone administration and 2, 4 and 6 hours after hydrocortisone administration. Urine output increased from 0.9±0.6 mL/kg/hr to 4.1±3.4mL/kg/hr. Twelve hours after the administration of hydrocortisone, dopamine requirement decreased from 11.0±2.9 μg/kg/min to 8.0±2.3 μg/kg/min, and to 5.5±3.4 μg/kg/min after 24 hours. Serum sodium concentration was increased from 130±4 mEq/L to 136±4 mEq/L, serum potassium concentration was decreased from 6.1±1.1 mEq/L to 4.6±0.6 mEq/L before and 12 hours after hydrocortisone administration. Conclusion: In preterm infants with adrenal insufficiency-associated hypotension, hydrocortisone administration improved blood pressure and urine output, decreased vasopressor requirement, and normalized serum electrolyte abnormalities.
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