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Prognostic role of D-dimer for in-hospital and 1-year mortality in exacerbations of COPD

Authors Hu G, Wu Y, Zhou Y, Wu Z, Wei L, Li Y, Peng G, Liang W, Ran P

Received 16 May 2016

Accepted for publication 30 August 2016

Published 31 October 2016 Volume 2016:11(1) Pages 2729—2736


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Richard Russell

Guoping Hu,1 Yankui Wu,2 Yumin Zhou,3 Zelong Wu,1 Liping Wei,1 Yuqun Li,1 GongYong Peng,3 Weiqiang Liang,1 Pixin Ran3

1Department of Respiratory Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 2Department of Respiratory Disease of People’s Hospital of Guangxi Zhuang Autonomous Region, Guangxi Zhuang Autonomous Region, 3Guangzhou Institute of Respiratory Disease, State Key Lab of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, People’s Republic of China

Background and objective: Serum D-dimer is elevated in respiratory disease. The objective of our study was to investigate the effect of D-dimer on in-hospital and 1-year mortality after acute exacerbations of chronic obstructive pulmonary disease (AECOPD).
Methods: Upon admission, we measured 343 AECOPD patients’ serum D-dimer levels and arterial blood gas analysis, and recorded their clinical characteristics. The level of D-dimer that discriminated survivors and non-survivors was determined using a receiver operator curve (ROC). The risk factors for in-hospital mortality were identified through univariate analysis and multiple logistic regression analyses. To evaluate the predictive role of D-dimer for 1-year mortality, univariate and multivariate Cox regression analyses were performed.
Results: In all, 28 patients died, and 315 patients survived in the in-hospital period. The group of dead patients had lower pH levels (7.35±0.11 vs 7.39±0.05, P<0.0001), higher D-dimer, arterial carbon dioxide tension (PaCO2), C-reactive protein (CRP), and blood urea nitrogen (BUN) levels (D-dimer 2,244.9±2,310.7 vs 768.2±1,078.4 µg/L, P<0.0001; PaCO2: 58.8±29.7 vs 46.1±27.0 mmHg, P=0.018; CRP: 81.5±66, P=0.001; BUN: 10.20±6.87 vs 6.15±3.15 mmol/L, P<0.0001), and lower hemoglobin levels (118.6±29.4 vs 128.3±18.2 g/L, P=0.001). The areas under the ROC curves of D-dimer for in-hospital death were 0.748 (95% confidence interval (CI): 0.641–0.854). D-dimer ≥985 ng/L was a risk factor for in-hospital mortality (relative risk =6.51; 95% CI 3.06–13.83). Multivariate logistic regression analysis also showed that D-dimer ≥985 ng/L and heart failure were independent risk factors for in-hospital mortality. Both univariate and multivariate Cox regression analyses showed that D-dimer ≥985 ng/L was an independent risk factor for 1-year death (hazard ratio (HR) 3.48, 95% CI 2.07–5.85 for the univariate analysis; and HR 1.96, 95% CI 1.05–3.65 for the multivariate analysis).
Conclusion: D-dimer was a strong and independent risk factor for in-hospital and 1-year death for AECOPD patients.

Keywords: AECOPD, chronic obstructive pulmonary diseases, D-dimer, mortality, prognosis

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