18세 이하 무비증 환자에서 발생한 침습성 세균 감염증에 대한 후향적 연구
A Retrospective Study of Invasive Bacterial Infections in Children with Asplenia
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목적: 무비증 환자에서 높은 사망률을 보이는 침습성 세균 감염의 위험성은 잘 알려져 있으며 예방적항생제 처방 및 특히 피막세균에 대한 예방접종이 강조된다. 최근 피막세균에 대한 국내 백신 영역에서많은 변화가 있었으나 국내 무비증 소아청소년 환자의 현황과 침습성 세균 감염, 예방적 항생제 처방및 예방접종의 실태에 관한 보고는 찾기 어렵다. 방법: 1997년 1월부터 2016년 12월까지 20년간 단일 3차 병원의 18세 이하 소아청소년 무비증 환자를 대상으로 후향적 의무기록 분석 기술 연구를 시행하였다. 결과: 총 213명의 소아청소년 무비증 환자 중 선천성 무비증은 114명(53.5%), 기능성 무비증은 58명(27.2%)이었으며 나머지 41명(19.3%)은 후천성 무비증이었다. 비장절제술을 받은 중앙 연령은 12.2 세(범위, 5.0–16.9세)였으며 수술의 가장 흔한 원인은 유전구형적혈구증(39.0%)이었다. 전체 무비증환자 중 16.4%만이 1년 이상 예방적 항생제를 유지하였고 항균제는 amoxicillin이 94.3%로 가장 흔하였으며 유지기간 중앙값은 41개월(범위, 12–161개월)이었다. 전체 무비증 환자 중 168명(78.9%)에서 예방접종력을 확인할 수 있었으며, 각 피막세균에 대한 예방접종률은 폐렴사슬알균이 44.1%, b형인플루엔자균(Haemophilus influenzae type B)은 53.0%, 수막알균은 10.7%로 낮았고 3가지 백신을모두 완료한 환자는 8.7%에 불과하였다. 연구 기간 동안 총 6명에서 6예(2.8%, 0.28/100인년)의 침습성 세균 감염증이 발생하였고 5예는 선천성 무비증, 1예는 기능성 무비증군에서 발생하였으며 발생 중앙 연령은 15개월(범위, 4–68개월)이었다. 6예 중 5예는 균혈증, 1예는 뇌수막염이었고, 가장 흔한균은 폐렴사슬알균(n=3)이었으며 그 외 H. influenzae 가 1예 있었다. 6예 중 3예(50.0%)가 사망하였고 모두 폐렴사슬알균 균혈증이었다. 6예 모두 예방적 항생제를 처방받지 않았고 예방접종력을 확인할수 있었던 4예 중 1예만 Hib의 접종을 완료하였으나 나머지 모두는 피막세균 예방접종을 전혀 받지 않았다. 결론: 무비증 환자에서 높은 사망률을 보이는 침습성 세균 감염의 위험은 전통적으로 잘 알려져 있음에도 불구하고 적절한 예방적 항생제 처방 및 필수 예방접종률은 여전히 낮은 수준이다. 따라서 임상 의사는 무비증 환자의 정기적 추적 관찰뿐만 아니라 적절한 예방적 항생제 및 필수 예방접종에 대해 숙지할 필요가 있다.
Abstract
Purpose: Because children with asplenia have an increased risk of fulminant infection associated with a high fatality, chemoprophylaxis, and vaccinations against encapsulated bacteria are recommended. However, there have been few reports of the burden of severe bacterial infection and the current status of chemoprophylaxis and immunization among children with asplenia in Korea. Methods: We conducted a retrospective study including children with asplenia who were treated at our institute between January 1997 and December 2016. Results: From a total of 213 children with asplenia, 114 (53.5%) had congenital asplenia and 58 (27.2%) had functional asplenia. The remaining 41 (19.3%) had acquired asplenia with the median age at splenectomy being 12.2 years (range, 5.0 to 16.9 years); the most common cause of splenectomy was hereditary spherocytosis (39.0%). The chemoprophylaxis rate was 16.4%. The immunization rates were 44.1% for pneumococcus, 53.0% for Haemophilus influenzae type B, and 10.7% for meningococcus. The incidence of invasive bacterial infection among children with asplenia was 0.28/100 person-year; a total of six episodes (2.8%) were observed in five patients with congenital asplenia and one patient with functional asplenia. The median age for these infections was 15 months (range, 4 to 68 months). Five of the six episodes were bacteremia, and the other was meningitis. The most common pathogen was Streptococcus pneumoniae (n=3), followed by H. influenzae (n=1). Three of the six patients (50.0%) died, all of whom had pneumococcal bacteremia. None of the six had chemoprophylaxis or proper vaccinations. Conclusions: Although there is an increased risk of a severe infection proper vaccinations and chemoprophylaxis are still lacking. Physicians should be encouraged to implement appropriate chemoprophylaxis and immunizations for patients with asplenia.
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