第16页,共38页。
PCT辅助血培养指征选择
●Of the 939 blood culture sets, 816 (87%) were true negatives and generated annualized costs of approximately 750,000 dollars. Although only 56 (6%) of the blood culture sets were false positives, they resulted in annualized costs of 1.4-1.8 million dollars and added an estimated 1450-2200 extra hospital days/year. ● If blood culture collection were limited to patients with CAP and an
第8页,共38页。
病毒感染时诱导产生 IFNγ,抑制降钙素(CT)
mRNA的表达,因此,没有 PCT产生,所以血液中检
测不到PCT。
第9页,共38页。
LnPCT
PCT鉴别G+菌或G-菌感染
• G-菌感染PCT最高,平均
25;其次是G+菌,平均
15.9;然后是厌氧菌,平 均10。
• G-菌释放内毒素,刺激 机体使PCT升高。
⊿ 研究结论:PCT可有效排除菌血症诊断,且可预测严重菌血症,但不应忽视肾功能对此的影 响。
阴性
革兰氏阳 性菌
革兰氏
阴性菌
真菌
多菌种
污染
感染
阴性
革兰氏阳性
革兰氏阴
真菌
菌
性菌