胃腔定植菌在机械通气相关性肺炎发病机制中的作用

被引:48
作者
李华茵
何礼贤
胡必杰
王葆青
张杏怡
陈雪华
董荔
机构
[1] 复旦大学附属中山医院呼吸疾病研究所,复旦大学附属中山医院呼吸疾病研究所,复旦大学附属中山医院呼吸疾病研究所,复旦大学附属中山医院呼吸疾病研究所,复旦大学附属中山医院呼吸疾病研究所,复旦大学附属中山医院呼吸疾病研究所,复旦大学附属中山医院呼吸疾病研究所上海,上海,上海,上海,上海,上海,上海
关键词
呼吸,人工; 肺炎; 胃腔定植; 病原菌;
D O I
暂无
中图分类号
R563.1 [肺炎];
学科分类号
摘要
目的 探讨胃腔内病原菌定植的影响因素以及胃腔定植菌在机械通气相关性肺炎(VAP)内源性发病机制中的作用。方法 前瞻性队列研究 ,动态观察和比较重症监护病房 (ICU)建立人工气道包括气管插管或气管切开患者 (98例 ,VAP组 5 2例 ,无VAP组 4 6例 )胃腔和口咽部病原菌定植种类、浓度、与采样时间的关系 ,以及发生肺炎后下呼吸道标本中出现病原菌的种类与时序。结果  (1)胃腔内定植菌检出率随胃液pH值升高逐渐增加。胃液pH >4时 ,胃腔内革兰阴性杆菌分离率明显上升 ,VAP组革兰阴性杆菌检出率达 5 2 5 %。胃液pH值与胃内革兰阴性杆菌浓度的对数呈正相关 (r =0 4 87,P =0 0 0 1)。胃液pH >4时的VAP发生率高于pH≤ 4 (P =0 0 17)。 (2 )VAP组肠杆菌科细菌检出率随插管时间延长而增加 ,至插管第 5天达 4 5 2 % ,无VAP组为 11 1% (P <0 0 1)。 (3)肠杆菌科细菌在胃腔和口咽部定植有先后次序 ,胃腔肠杆菌科细菌早于口咽部定植 1~ 2d ,比较肠杆菌科细菌在两部位定植次序差异有显著性 (P =0 0 15 )。 (4) 5 2例VAP患者有 12例下呼吸道病原菌呈现胃腔→口咽部→下呼吸道的逆向定植次序。 3例出现胃腔→下呼吸道的定植次序。结论  (1)胃液pH值是影响胃腔定植菌特别是革兰阴性杆菌定植的主要因素。 (2 )VAP
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页码:36 / 40
页数:5
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