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要旨●抗菌薬関連出血性大腸炎(AAHC)症例の臨床的特徴を明らかにするために,AAHC自験例を対象として抽出し,Klebsiella oxytoca(K. oxytoca)陽性例の臨床的特徴を,非陽性例との比較を含め,遡及的に検討した.最近10年間に計18例(平均年齢は63.7歳,男性7例,女性11例)がAAHCと診断されていた.18例全例で培養検査が施行され,K. oxytoca陽性例は18例中14例(77.8%)を占めていた.K. oxytoca陽性14例の平均年齢は65.8歳で,男性7例,女性7例であった.投与されていた抗菌薬は8例がペニシリン系薬剤で半数を占め,陽性14例中3例で低用量アスピリンを含む非ステロイド性抗炎症薬(NSAIDs)の併用内服を認めた.便培養検査では14例中5例でペニシリン系耐性腸内細菌が同時に検出された.大腸内視鏡検査では9例で右半結腸中心に区域性出血性大腸炎を認めた.14例全例で抗菌薬の中止ないし変更で臨床症状が改善した.陽性14例と非陽性4例の臨床像と内視鏡像を比較したが,大差なかった.
To determine the clinical characteristics of AAHC(antibiotic-associated hemorrhagic colitis), we compared Klebsiella oxytoca(K. oxytoca)-positive with -negative AAHC patients. In the past 10 years, we have diagnosed 18 patients with AAHC(7 men and 11 women ; average age, 63.7 years). We tested cultures in all 18 subjects ; 14 patients(77.8%)were positive for K. oxytoca.
The 14 patients included seven men and seven women with an average age of 65.8 years. Eight patients had been taking penicillin antibiotics, and simultaneously, three patients had been taking NSAIDs(nonsteroidal anti-inflammatory drugs), including low-dose aspirin. According to the results of the stool culture tests, five among the 14 patients had some species of Enterobacter that is resistant to penicillin. Colonoscopy revealed that nine patients had segmental hemorrhagic colitis mainly in the right-side colon. All 14 patients recovered by discontinuing or changing their antibiotics. We compared the clinical characteristics and endoscopic findings of the 14 K. oxytoca-positive patients with four K. oxytoca-negative patients ; there were almost no differences between them.
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