Respiratory infectious phenotypes in acute exacerbation of COPD: an aid to length of stay and COPD Assessment Test
Received 10 July 2015
Accepted for publication 7 September 2015
Published 20 October 2015 Volume 2015:10(1) Pages 2257—2263
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 3
Editor who approved publication: Dr Richard Russell
Meng-Yuan Dai,1 Jin-Ping Qiao,2 Yuan-Hong Xu,2 Guang-He Fei1
1Pulmonary Department, 2Department of Clinical Laboratory, First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People’s Republic of China
Purpose: To investigate the respiratory infectious phenotypes and their impact on length of stay (LOS) and the COPD Assessment Test (CAT) Scale in acute exacerbation of COPD (AECOPD).
Patients and methods: We categorized 81 eligible patients into bacterial infection, viral infection, coinfection, and non-infectious groups. The respiratory virus examination was determined by a liquid bead array xTAG Respiratory Virus Panel in pharyngeal swabs, while bacterial infection was studied by conventional sputum culture. LOS and CAT as well as demographic information were recorded.
Results: Viruses were detected in 38 subjects, bacteria in 17, and of these, seven had both. Influenza virus was the most frequently isolated virus, followed by enterovirus/rhinovirus, coronavirus, bocavirus, metapneumovirus, parainfluenza virus types 1, 2, 3, and 4, and respiratory syncytial virus. Bacteriologic analyses of sputum showed that Pseudomonas aeruginosa was the most common bacteria, followed by Acinetobacter baumannii, Klebsiella, Escherichia coli, and Streptococcus pneumoniae. The longest LOS and the highest CAT score were detected in coinfection group. CAT score was positively correlated with LOS.
Conclusion: Respiratory infection is a common causative agent of exacerbations in COPD. Respiratory coinfection is likely to be a determinant of more severe acute exacerbations with longer LOS. CAT score may be a predictor of longer LOS in AECOPD.
Keywords: COPD, acute exacerbation, respiratory infectious, phenotypes, LOS, CAT
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