急性胆管炎は,胆管閉塞に伴う急激な胆管内圧の上昇によって感染胆汁が胆管から体循環に流入して全身の 炎症反応をきたすことにより発症し,この状態が持続すれば敗血症となる。重症急性胆管炎は,敗血症による
表 9 急性胆管炎の予後不良因子
予後規定因子 基準・基準値 文献
ビリルビン高値
> 2 mg/dL 13
> 2.2 mg/dL 70
> 2.93 mg/dL 71
> 4 mg/dL 17,18
> 5.26 mg/dL 20
> 5.56 mg/dL 72
> 8.1 mg/dL,> 9.2 mg/dL 25
> 9.1 mg/dL 73
> 10 mg/dL 74
アルブミン低値 < 3.0 g/dL 71,20,60
急性腎不全 BUN(> 20 〜> 64 mg/dL)
Creatinin(> 1.5〜> 2.0 mg/dL)
75
13,70,17,76
ショック 13,18,20,75
血小板減少 < 100,000 〜< 150,000 /mm3 20,60,76
エンドトキシン血症 / 菌血症 70,71,72,76
高熱
> 38 ℃ 13
> 39 ℃ 18
> 40 ℃ 73
併存疾患あり 13,17,20,60,75
高齢
≧ 50 yo 17
≧ 60 yo 13
≧ 70 yo 75,77
≧ 75 yo 78
原疾患が悪性腫瘍 70,17,72
PT 時間延長 14 sec ≦ 71,78
15 sec ≦ 13
白血球数 12,000 ≦ 13
20,000 ≦ 73,74
現在の喫煙 Yes 77,78
(文献 8 より和訳引用)
臓器障害をきたした病態であり,近年,敗血症の血清マーカーである血清プロカルシトニンの測定がより簡便 かつ迅速に急性胆管炎の重症度判定を行える可能性が報告されている。
血清プロカルシトニン値と急性胆管炎の重症度との関連に関して,症例集積研究 3 編が報告されている。血 清プロカルシトニン値は,TG 07 重症度判定基準の重症度に従って有意に高値であった(CS)79)と報告され,
さらに TG 13 重症度判定基準によって重症と判定された症例は軽症よりも有意に高値(CS)80),そして重症度 に従って有意に高値であった(CS)81)と報告されている。したがって,血清プロカルシトニン値は急性胆管炎 の重症度判定に有用であることが示唆される。しかし,まだエビデンスは少なく単施設の小規模な症例集積研 究のみであり,その有用性に関しては今後さらなる臨床研究が必要である。
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