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Lower neutrophil-to-lymphocyte ratio predicts high risk of multidrug-resistant Pseudomonas aeruginosa infection in patients with hospital-acquired pneumonia

Authors Zhou YQ, Feng DY, Li WJ, Yang HL, Wang ZN, Zhang TT, Chen ZG

Received 5 July 2018

Accepted for publication 24 August 2018

Published 2 October 2018 Volume 2018:14 Pages 1863—1869


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Professor Deyun Wang

Yu-Qi Zhou,1,2,* Ding-Yun Feng,1,2,* Wen-Juan Li,1,2 Hai-Ling Yang,1,2 Zhao-Ni Wang,3 Tian-Tuo Zhang,1,2 Zhuang-Gui Chen1,3

1Institute of Respiratory Diseases of Sun Yat-Sen University, Guangzhou, Guangdong, China; 2Department of Internal Medicine, Division of Respiratory Diseases, Guangzhou, Guangdong, China; 3Department of Pediatrics, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China

*These authors contributed equally to this work

Background and purpose: Hospital-acquired pneumonia (HAP) remains an important cause of morbidity and mortality despite advances in antimicrobial therapy. The emergence of multidrug resistant (MDR) Pseudomonas aeruginosa (PA) is of major concern. Our aim was to evaluate the risk factors and prognosis of HAP due to MDR-PA infection.
Patients and methods: In a retrospective observational study, we collected data on all episodes of HAP caused by PA (PA-HAP) occurring from January 2013 to December 2016. Characteristics of patients with drug-sensitive PA were compared with those with MDR-PA. Data of demographic, underlying conditions, peripheral neutrophil-to-lymphocyte ratio (NLR), and clinical outcomes were collected and analyzed.
Results: One hundred fifty-seven patients with PA-HAP were included, of which 69 (43.9%) patients were diagnosed with MDR-PA infection. There were significant differences between MDR-PA group and non-MDR-PA group on the following variables: initial inappropriate antibiotic therapy (P<0.001, OR 0.103, 95% CI 0.044–0.244), admission in more than two departments in previous 30 days (P<0.001, OR 0.186, 95% CI 0.072–0.476), and NLR level (P=0.020, OR 0.911, 95% CI 0.843–0.985). The effect of antibiotic treatment was significantly different (P<0.001, OR 4.263, 95% CI 2.142–8.483). The 30-day mortality was higher in MDR-PA group than that in non-MDR-PA group (P<0.001).
Conclusion: We have shown that lower NLR level was identified as a clinical predictor of MDR-PA infection in HAP patients. Even with goal-directed therapy, MDR-PA infection implicates poor outcomes in patients with HPA.

Keywords: risk factors, prognosis, multidrug-resistant Pseudomonas aeruginosa, hospital-acquired pneumonia

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