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中华重症医学电子杂志 ›› 2022, Vol. 08 ›› Issue (02) : 126 -132. doi: 10.3877/cma.j.issn.2096-1537.2022.02.008

临床研究

环介导恒温扩增快速检测芯片在VAP中的应用价值
杨航1, 康焰1,(), 廖雪莲1   
  1. 1. 610041 成都,四川大学华西医院重症医学科
  • 收稿日期:2022-02-10 出版日期:2022-07-04
  • 通信作者: 康焰
  • 基金资助:
    四川大学华西医院学科卓越发展1·3·5项目(ZYGD18020)

Clinical evaluation of a rapid 13-pathogen detecting loop-mediated isothermal amplification chip in ventilator-associated pneumonia patients

Hang Yang1, Yan Kang1,(), Xuelian Liao1   

  1. 1. Department of Critical Care Medicine, West China Hospital, Sichuan University, Chengdu 610041, China
  • Received:2022-02-10 Published:2022-07-04
  • Corresponding author: Yan Kang
引用本文:

杨航, 康焰, 廖雪莲. 环介导恒温扩增快速检测芯片在VAP中的应用价值[J]. 中华重症医学电子杂志, 2022, 08(02): 126-132.

Hang Yang, Yan Kang, Xuelian Liao. Clinical evaluation of a rapid 13-pathogen detecting loop-mediated isothermal amplification chip in ventilator-associated pneumonia patients[J]. Chinese Journal of Critical Care & Intensive Care Medicine(Electronic Edition), 2022, 08(02): 126-132.

目的

探讨环介导恒温扩增(LAMP)快速检测芯片在呼吸机相关性肺炎(VAP)中的应用价值。

方法

选择2019年10月至2021年6月在四川大学华西医院ICU诊断为VAP的患者155例,年龄(56.1±8.5)岁,男性患者100例(64.5%),急性生理学与慢性健康状况(APACHE Ⅱ)评分为20(15,25)分。根据是否进行LAMP检测分为LAMP组(80例)和传统培养组(75例)。比较2组病原菌检出情况、72 h内抗菌药物调整情况和临床结局。

结果

相较于传统培养组,LAMP组病原体检出时间明显缩短,差异有统计学意义[26(21,28)h vs 48(45,69)h,Z=8.075,P<0.001];经验性抗菌药物首次调整时间明显缩短,差异有统计学意义[32(26,47)h vs 48(41,50)h,Z=6.584,P=0.004];72 h内经验性抗菌药物调整比例明显升高,差异有统计学意义(42.5% vs 20.0%,χ2=20.675,P=0.003)。2组患者培养检出阳性率、72 h内抗菌药物使用恰当率、ICU住院时间及病死率比较,差异均无统计学意义(P>0.05)。

结论

LAMP检测方法相较于传统培养检出更快速,可直接影响抗菌药物选择,致使更多的患者在更早期调整经验性抗菌药物,可作为临床病原体检验方法的有效补充。

Objective

To investigate the clinical value of a rapid 13-pathogen detecting loop-mediated isothermal amplification (LAMP) chip in ventilator-associated pneumonia patients.

Methods

A retrospective cohort study was conducted in intensive care unit (ICU), West China Hospital, Sichuan University from October 2019 to June 2021. 155 patients diagnosed with ventilator-associated pneumonia, with age (56.1±8.5) years, 100 male patients (64.5%), acute physiology and chronic health status (APACHE Ⅱ) score 20 (15,25). They were grouped into LAMP or conventional group based on the usage of LAMP technique (80 in LAMP group and 75 in conventional group). Pathogens identification, antimicrobial therapy in 72 h and clinical outcome between these two groups were compared.

Results

Compared with the conventional group, the pathogen detection time of the LAMP group was significantly shorter, and the difference was statistically significant [26 (21, 28) h vs 48 (45, 69) h, Z=8.075, P<0.001]; the adjustment time of the first empirical antimicrobial drugs was significantly shorter, and the difference was significant [32 (26, 47) h vs 48 (41, 50) h, Z=6.584, P=0.004]; the proportion of empirical antimicrobial adjustments was higher significantly within 72 h with statistic significance (42.5% vs 20.0%, χ2=20.675, P=0.003). There were no significant differences in positive detected rate of in the culture, the appropriate antimicrobial use in 72 h, ICU stay and mortality rate (P>0.05).

Conclusion

Compared with conventional culture, LAMP test method can identify pathogens faster, and directly guide the adjustment of antibiotics. It can be used as an effective supplement to clinical test methods to guide clinical medication.

表1 2组VAP患者基线资料比较
基线资料 合计(155例) LAMP组(80例) 传统培养组(75例) 统计值 P
一般资料

年龄[岁,

x¯
±s

56.1±8.5 57.2±9.2 55.6±8.2 t=0.665 0.838

男性[例(%)]

100(64.5) 49(61.3) 51(68.0) χ2=0.244 0.380
基础疾病[例(%)]

高血压

71(45.8) 38(47.5) 33(44.0) χ2=1.055 0.662

糖尿病

27(17.4) 15(18.8) 12(16.0) χ2=0.982 0.652

心血管疾病

22(14.2) 9(11.3) 13(17.3) χ2=2.746 0.278

慢性肺部疾病

48(31.0) 24(30.0) 24(32.0) χ2=0.689 0.788

慢性肾脏疾病

22(14.2) 14(17.5) 8(10.7) χ2=3.052 0.223

慢性肝脏疾病

9(5.9) 6(7.5) 3(4.0) χ2=2.047 0.352

恶性肿瘤

24(15.5) 13(16.3) 11(14.7) χ2=0.766 0.785

免疫抑制

23(14.9) 12(15.0) 11(14.7) χ2=0.186 0.953
实验室检查

体温(℃,

x¯
±s

37.4±0.6 37.4±0.6 37.2±0.7 t=0.894 0.706

白细胞(109/L,

x¯
±s

10.8±1.7 10.9±1.9 10.8±1.7 t=0.796 0.765

降钙素原[ng/ml,MQ25Q75)]

10.7(0.4,30.7) 11.3(0.4,31.3) 10.0(0.3,28.8) Z=2.056 0.355

乳酸[mmol/L,MQ25Q75)]

1.5(1.1,1.9) 1.5(1.1,1.9) 1.45(1.1,1.9) Z=0.346 0.994
严重度评分

APACHE Ⅱ评分[分,MQ25Q75)]

20(15,25) 21(15,26) 18(14,24) Z=0.974 0.381
ICU支持治疗[例(%)]

肾替代治疗

27(17.4) 12(15.0) 15(20.0) χ2=1.752 0.412

血管活性药物

51(32.9) 27(33.8) 24(32.0) χ2=0.846 0.817
表2 2组VAP患者病原菌检验结果[例(%)]
表3 2组VAP患者对早期抗菌药物调整及临床结局的影响
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