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Original Research |

Prevalence and Localization of Pulmonary Embolism in Unexplained Acute Exacerbations of COPD: A systematic review and meta-analysis

F.E. Aleva, MD, PhD student; L.W.L.M. Voets, Bsc; S.O. Simons, MD, PhD; Q. de Mast, MD, PhD; A.J.A.M. van der Ven, MD, PhD; Y.F. Heijdra, MD, Phd
Author and Funding Information

Summary conflict of interest statements.

None of the authors have any conflicts of interest to disclose.

Funding information.

No funding was received for this project

Notation of prior abstract publication/presentation

This work has not been submitted, nor presented elsewhere.

aDepartment of Respiratory Medicine, Radboud University Medical Center

bDepartment of Internal Medicine, Radboud University Medical Center

Corresponding author information. F.E. Aleva Radboud UMC, Dept. Respiratory Medicine. Geert Grooteplein-Zuid 10 6525 GA, Nijmegen The Netherlands .


Copyright 2016, . All Rights Reserved.


Chest. 2016. doi:10.1016/j.chest.2016.07.034
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Abstract

Background  COPD patients encounter episodes of increased inflammation, so-called acute exacerbations of COPD (AE-COPD). In 30% of AE-COPD no clear etiology is found. Since there is a well-known crosstalk between inflammation and thrombosis, the objectives of this study were to determine the prevalence, embolus localization and clinical relevance, and clinical markers of pulmonary embolism (PE) in unexplained AE-COPD.

Methods  A systematic search was performed using MEDLINE and EMBASE platforms from 1974 – October 2015. Prospective- and cross-sectional studies that included patients with an AE-COPD and used pulmonary CT-angiography for diagnosis of PE were included.

Results  The systematic search resulted in 1650 records. Main reports of 22 articles were reviewed and 7 studies were included. The pooled prevalence of PE in unexplained AE-COPD was 16.1% (95% confidence-interval 8.3%-25.8%) in a total of 880 patients. Sixty-eight percent of the emboli found were located in the main pulmonary arteries, lobar arteries or inter-lobar arteries. Mortality and length of hospital admission seem to be increased in patients with unexplained AE-COPD and PE. Pleuritic chest pain and cardiac failure were more frequently reported in patients with unexplained AE-COPD and PE. In contrast, signs of respiratory tract infection was less frequently related to PE.

Conclusions  PE is frequently seen in unexplained AE-COPD. Two-thirds of emboli are found at localizations that have a clear indication for anticoagulant treatment. These findings merit clinical attention. PE should receive increased awareness in patients with unexplained AE-COPD, especially when pleuritic chest pain and signs of cardiac failure are present and no clear infectious origin can be identified.


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