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van Bragt JJ, Brinkman P, de Vries R, Vijverberg SJ, Weersink EJ, Haarman EG, de Jongh FH, Kester S, Lucas A, in 't Veen JC, Sterk PJ, Bel EH, Maitland-van der Zee AH. Identification of recent exacerbations in COPD patients by electronic nose. ERJ Open Res 2020; 6:00307-2020. [PMID: 33447611 PMCID: PMC7792783 DOI: 10.1183/23120541.00307-2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 09/28/2020] [Indexed: 12/17/2022] Open
Abstract
Molecular profiling of exhaled breath by electronic nose (eNose) might be suitable as a noninvasive tool that can help in monitoring of clinically unstable COPD patients. However, supporting data are still lacking. Therefore, as a first step, this study aimed to determine the accuracy of exhaled breath analysis by eNose to identify COPD patients who recently exacerbated, defined as an exacerbation in the previous 3 months. Data for this exploratory, cross-sectional study were extracted from the multicentre BreathCloud cohort. Patients with a physician-reported diagnosis of COPD (n=364) on maintenance treatment were included in the analysis. Exacerbations were defined as a worsening of respiratory symptoms requiring treatment with oral corticosteroids, antibiotics or both. Data analysis involved eNose signal processing, ambient air correction and statistics based on principal component (PC) analysis followed by linear discriminant analysis (LDA). Before analysis, patients were randomly divided into a training (n=254) and validation (n=110) set. In the training set, LDA based on PCs 1-4 discriminated between patients with a recent exacerbation or no exacerbation with high accuracy (receiver operating characteristic (ROC)-area under the curve (AUC)=0.98, 95% CI 0.97-1.00). This high accuracy was confirmed in the validation set (AUC=0.98, 95% CI 0.94-1.00). Smoking, health status score, use of inhaled corticosteroids or vital capacity did not influence these results. Exhaled breath analysis by eNose can discriminate with high accuracy between COPD patients who experienced an exacerbation within 3 months prior to measurement and those who did not. This suggests that COPD patients who recently exacerbated have their own exhaled molecular fingerprint that could be valuable for monitoring purposes.
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Affiliation(s)
- Job J.M.H. van Bragt
- Amsterdam UMC, University of Amsterdam, Dept of Respiratory Medicine, Amsterdam, The Netherlands
| | - Paul Brinkman
- Amsterdam UMC, University of Amsterdam, Dept of Respiratory Medicine, Amsterdam, The Netherlands
| | - Rianne de Vries
- Amsterdam UMC, University of Amsterdam, Dept of Respiratory Medicine, Amsterdam, The Netherlands
- Breathomix BV, Leiden, The Netherlands
| | - Susanne J.H. Vijverberg
- Amsterdam UMC, University of Amsterdam, Dept of Respiratory Medicine, Amsterdam, The Netherlands
| | - Els J.M. Weersink
- Amsterdam UMC, University of Amsterdam, Dept of Respiratory Medicine, Amsterdam, The Netherlands
| | - Eric G. Haarman
- Amsterdam UMC, Vrije Universiteit Amsterdam, Dept of Pediatric Respiratory Medicine, Amsterdam, The Netherlands
| | - Frans H.C. de Jongh
- Medisch Spectrum Twente, Dept of Pulmonary Function, Enschede, The Netherlands
| | - Sigrid Kester
- Medisch Centrum Den Bosch Oost, ’s-Hertogenbosch, The Netherlands
| | | | | | - Peter J. Sterk
- Amsterdam UMC, University of Amsterdam, Dept of Respiratory Medicine, Amsterdam, The Netherlands
| | - Elisabeth H.D. Bel
- Amsterdam UMC, University of Amsterdam, Dept of Respiratory Medicine, Amsterdam, The Netherlands
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Kester S, McCarty DL, McCarty GA. The antiphospholipid antibody syndrome in the emergency department setting--livedo reticularis and recurrent venous thrombosis. Ann Emerg Med 1992; 21:207-11. [PMID: 1739215 DOI: 10.1016/s0196-0644(05)80168-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We present the case of a 26-year-old man with an exacerbation of apparent chronic asthma with chronic peripheral vascular disease due to recurrent venous thrombosis. Localized livedo reticularis, new cutaneous infarctions, severe venous insufficiency, thrombocytopenia, renal failure, and cerebral supratentorial dysfunction were noted. During hospital admission, antibodies to phospholipids in high titer were present by three different testing methods. Renal biopsy demonstrated significant renal vasculature abnormalities characteristic of hemolytic endovasculopathy, and magnetic resonance imaging showed multiple cerebral infarctions. This case exemplifies the spectrum of presentations and management of the primary antiphospholipid antibody syndrome. The clue to its presence in this patient was the livedo reticularis rash, a cutaneous marker for this syndrome that was evident in the emergency department.
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Affiliation(s)
- S Kester
- Department of Emergency Medicine, Oklahoma University Health Sciences Center, Oklahoma City
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