消化道重建术后肠道细菌移位的临床研究

目的：探讨消化道重建术后肠黏膜屏障损伤与肠道细菌移位（BT）及BT与术后全身炎症反应综合征（SIRS）的关系。方法：选择60例择期行消化道重建术的患者,于术前和术后1、3、5 d采集外周血,进行血浆二胺氧化酶及全血细菌DNA检测。全血DNA提取后进行PCR扩增,采用的靶基因为大肠杆菌特异性β半乳糖苷酶基因和16SrRNA基因。观察患者至术后10 d以监测SIRS情况。结果：术前PCR检测全血细菌DNA均为阴性,术后共有14例阳性。23例患者术后发生SIRS,其中12例患者PCR阳性。PCR阳性组SIRS发生率为85.7%（12/14）,阴性组为23.9%（11/46）（P〈0.01）。术后出现SIRS的患者PCR阳性率为52.2%（12/23）,无SIRS组为5.4%（2/37）（P〈0.01）。PCR阳性的患者血浆二胺氧化酶浓度较PCR阴性者明显升高（P〈0.01）,有SIRS的患者血浆二胺氧化酶较无SIRS患者明显升高（P〈0.01）。结论：消化道重建术后BT与肠黏膜屏障损伤密切相关,术后SIRS与BT密切相关。PCR技术可早期诊断细菌移位,对术后SIRS有较好的早期预警价值。

Clinical study on bacterial translocation in patients after digestive tract reconstruction

Objective:To investigate gut barrier dysfunction and bacterial translocation (BT) in patients who underwent digestive tract reconstruction and to study the relationship between BT and acute systemic inflammatory state (SIRS). Method： Sixty patients who underwent selective digestive tract reconstruction were observed. Blood were collected before surgery and 1, 3, 5 days after surgery to detect plasma diamine oxidase(DAO) and bacterial DNA. PCR analysis was performed with β-Galactosidase gene of Eschenchia coli and 16SrRNA gene as target gene. The SIRS of all the patients were observed for 10 days. Result：All the PCR results before operation were negative, while there was positive in 14 patients after digestive tract reconstruction. There were 23 patients with SIRS after surgery, and 12 patients PCR result were positive among 23 patients with SIRS. 85.7% of the patients(12/14) with positive PCR result had SIRS, while 23.9% patients (11/46) with negative PCR result had SIRS (P<0.01).The positive PCR rate in SIRS was 52.2% (12/23), which was remarkably higher than that without SIRS(5.4%, 2/37, P<0.01).The levels of plasma DAO in patients with positive PCR result was significantly higher than those of the patients with negative PCR result (P<0.01). The levels of plasma DAO in patients with SIRS was significantly higher than those of patients without SIRS (P<0.01). Conclusion:The gut barrier dysfunction was closely related to BT, and BT was closely related to postoperative SIRS. PCR analysis can be used in early diagnosis of BT, the positive PCR result might be a useful early warning sign of postoperative SIRS.