Acute Pulmonary Embolism Associated with COVID-19 Pneumonia Detected with Pulmonary CT Angiography
2020; Radiological Society of North America; Volume: 296; Issue: 3 Linguagem: Inglês
10.1148/radiol.2020201544
ISSN1527-1315
AutoresFranck Grillet, Julien Behr, Paul Calame, S. Aubry, Éric Delabrousse,
Tópico(s)COVID-19 and healthcare impacts
ResumoHomeRadiologyVol. 296, No. 3 PreviousNext Original ResearchFree AccessResearch LetterAcute Pulmonary Embolism Associated with COVID-19 Pneumonia Detected with Pulmonary CT AngiographyFranck Grillet , Julien Behr, Paul Calame, Sébastien Aubry, Eric DelabrousseFranck Grillet , Julien Behr, Paul Calame, Sébastien Aubry, Eric DelabrousseAuthor AffiliationsFrom the Department of Radiology. Centre Hospitalier Universitaire de Besançon, Boulevard Fleming, 25030 Besançon, France (F.G., J.B., P.C., S.A., E.D.); and Nanomedecine Laboratory, INSERM EA4662, University of Franche-Comte, 25000 Besançon, France (S.A., E.D.).Address correspondence to F.G. (e-mail: [email protected]).Franck Grillet Julien BehrPaul CalameSébastien AubryEric DelabroussePublished Online:Apr 23 2020https://doi.org/10.1148/radiol.2020201544MoreSectionsPDF ToolsAdd to favoritesCiteTrack Citations ShareShare onFacebookXLinked In AbstractOnline supplemental material is available for this article.IntroductionChest CT plays an important role in optimizing the treatment of patients with coronavirus disease 2019 (COVID-19) while also eliminating alternate diagnoses or added pathologic conditions, particularly for acute pulmonary embolism (1). A few studies and isolated clinical cases of COVID-19 pneumonia with coagulopathy and pulmonary embolus have recently been published (2–4). The main objective of our study was to evaluate pulmonary embolus in association with COVID-19 infection by using pulmonary CT angiography.Materials and MethodsThis retrospective study was approved by our institutional review board. It followed the ethical guidelines of the Declaration of Helsinki. The requirement for written informed consent was waived. Three authors (F.G., J.B., P.C.) had access to the study data. No author has any conflict of interest to declare in relation to this study.PatientsThe inclusion criteria were consecutive adult patients (≥18 years) with a reverse-transcription polymerase chain reaction diagnosis (NucleoSpin RNA virus kit; Macherey-Nagel, Bethlehem, Pa) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) or a strong clinical suspicion of COVID-19 (fever and/or acute respiratory symptoms, exposure to an individual with confirmed SARS-CoV-2 infection) who underwent chest CT between March 15 and April 14, 2020, at a single center. In patients suspected of having or confirmed to have SARS-CoV-2 infection, chest CT was performed when clinical features of severe disease were present (eg, mechanical ventilation was required or the patient had underlying comorbidities). Patients with unenhanced chest CT scans were excluded.CT ProtocolOur routine protocol for patients with severe clinical features of COVID-19 infection was multidetector pulmonary CT angiography using a 256-slice multidetector CT scanner (Revolution; GE Healthcare, Milwaukee, Wis) after intravenous injection of 60 mL iodinated contrast material (Iomeprol, 400 mg of iodine per milliliter; Bracco Imaging, Milan, Italy) at a flow rate of 4 mL/sec, triggered on the main pulmonary artery. CT scan settings were as follows: 120 kVp, collimation of 80 × 0.625 mm, rotation time of 0.28 second, average tube current of 300 mA, pitch of 0.992, and volume CT dose index of 4.28 mGy.Imaging AnalysisThe chest CT scan pattern of COVID-19 and presence of pulmonary embolus were independently analyzed by two chest radiologists (J.B. and F.G., with 11 and 6 years of experience, respectively) using a picture archiving and communications system workstation (Carestream Health, Rochester, NY). Readers were blinded to patient status as well as to clinical and biologic features. In cases of discordance, a simultaneous reading to reach consensus was achieved.Statistical AnalysisComparisons between continuous variables were performed by using the Student t test when distribution was normal. Comparisons between categoric variables were performed by using the Pearson χ2 test or Fisher exact test. To determine the clinical factors associated with pulmonary embolus, we considered the CT extent of lesions, need for invasive mechanical ventilation, demographic characteristics, and presence of comorbidities as potential independent variables in a logistic regression model. P < .05 was indicative of a significant difference. All analyses were performed with R version 3.4.4 software (R Core Team 2017, R Foundation for Statistical Computing, Vienna, Austria).ResultsOf 2003 patients diagnosed with COVID-19, 280 were hospitalized during the study period. Of these 280 patients, 129 (46%) underwent CT a mean of 9 days ± 5 (standard deviation) after symptom onset. Twenty-nine patients underwent unenhanced chest CT due to contraindication to iodinated contrast material or nonsevere clinical features; thus, these patients were excluded. Finally, 100 patients with COVID-19 infection and severe clinical features were included and examined with contrast material–enhanced CT (Fig 1). The mean age of the included patients was 66 years ± 13, and there were 70 men and 30 women (Table).Figure 1: Flowchart of the study. COVID-19= coronavirus disease 2019, RT-PCR = reverse-transcription polymerase chain reaction.Figure 1:Download as PowerPointFigure 2: Images from pulmonary CT angiography in a 68-year-old man. CT scans were obtained 10 days after the onset of coronavirus disease 2019 symptoms on the day the patient was transferred to the intensive care unit. A, B, Axial CT images (lung windows) show peripheral ground-glass opacities (arrow in A) associated with areas of consolidation in dependent portions of the lung (white arrowhead). Interlobular reticulations, bronchiectasis (black arrowhead) and lung architectural distortion are present. Involvement of the lung volume was estimated to be between 25% and 50%. C, D, Coronal CT reformations (mediastinum windows) show bilateral lobar and segmental pulmonary embolism (arrows).Figure 2:Download as PowerPointPatient CharacteristicsOf the 100 patients meeting the inclusion criteria, 23 (23%, [95% confidence interval: 15%, 33%]) had acute pulmonary embolism (Fig E2, Appendix E1 [online]). Patients with pulmonary embolus were more frequently in the critical care unit than those without pulmonary embolus (17 [74%] vs 22 [29%] patients, respectively; P < .001), required mechanical ventilation more often (15 of 23 patients [65%] vs 19 of 77 patients [25%], P < .001), and had longer delay from symptom onset to CT diagnosis of pulmonary embolus (mean, 12 days ± 6 vs 8 days ± 5, P < .001) (Table). At multivariable analysis, requirement for mechanical ventilation (odds ratio = 3.8 [95% confidence interval: 1.02, 15], P = .049) remained associated with acute pulmonary embolus (Table E3, Appendix E1 [online]).DiscussionOur study points to a high prevalence of acute pulmonary embolism in patients with coronavirus disease 2019 (23% [95% confidence interval: 15%, 33%]). Pulmonary embolus was diagnosed a mean of 12 days from symptom onset. Patients with pulmonary embolus were more likely to require care in the critical care unit and to require mechanical ventilation compared with those without pulmonary embolus.Current guidelines (1,5,6) recommend performing unenhanced chest CT to assess the COVID-19 CT pattern and its extension. However, previous reports suggested coagulopathy associated with COVID-19 infection (2,3). Furthermore, these patients have frequent risk factors for pulmonary embolus (eg, mechanical ventilation, intensive care unit admission). Therefore, we routinely performed contrast-enhanced CT for patients with COVID-19 with severe clinical features to evaluate the lung parenchyma as well as to evaluate other complications that may result in respiratory distress.Our results showed frequent (23%) pulmonary embolus in patients with COVID-19. At multivariable analysis, pulmonary embolus was associated with invasive mechanical ventilation and male sex. Interestingly, extent of lesions was not associated with pulmonary embolus. We acknowledge the preliminary nature of these findings, including its retrospective nature and limited sample size. Important clinical markers were not available that may explain or be associated with pulmonary embolus, including d-dimer level (only 22 of the 100 patients had d-dimer levels available). Nevertheless, our results suggest that patients with severe clinical features of COVID-19 may have associated acute pulmonary embolus. Therefore, the use of contrast-enhanced CT rather than routine unenhanced CT may be considered for these patients.Disclosures of Conflicts of Interest: F.G. disclosed no relevant relationships. J.B. disclosed no relevant relationships. P.C. disclosed no relevant relationships. S.A. disclosed no relevant relationships. E.D. disclosed no relevant relationships.Author ContributionsAuthor contributions: Guarantors of integrity of entire study, F.G., J.B., E.D.; study concepts/study design or data acquisition or data analysis/interpretation, all authors; manuscript drafting or manuscript revision for important intellectual content, all authors; approval of final version of submitted manuscript, all authors; agrees to ensure any questions related to the work are appropriately resolved, all authors; literature research, F.G., J.B., E.D.; clinical studies, F.G., J.B.; statistical analysis, P.C.; and manuscript editing, all authorsReferences1. Revel MP, Parkar AP, Prosch H, et al. COVID-19 patients and the radiology department - advice from the European Society of Radiology (ESR) and the European Society of Thoracic Imaging (ESTI). Eur Radiol 2020 Apr 20 [Epub ahead of print]. Crossref, Google Scholar2. Danzi GB, Loffi M, Galeazzi G, Gherbesi E. Acute pulmonary embolism and COVID-19 pneumonia: a random association? Eur Heart J 2020 Mar 30 [Epub ahead of print]. Crossref, Medline, Google Scholar3. Xie Y, Wang X, Yang P, Zhang S. COVID-19 Complicated by Acute Pulmonary Embolism. Radiol Cardiothorac Imaging 2020;2(2):e200067. Link, Google Scholar4. Goeijenbier M, van Wissen M, van de Weg C, et al. Review: Viral infections and mechanisms of thrombosis and bleeding. J Med Virol 2012;84(10):1680–1696. Crossref, Medline, Google Scholar5. Simpson S, Kay FU, Abbara S, et al. Radiological Society of North America Expert Consensus Statement on Reporting Chest CT Findings Related to COVID-19. Endorsed by the Society of Thoracic Radiology, the American College of Radiology, and RSNA. Radiol Cardiothorac Imaging 2020;2(2):e200152. Link, Google Scholar6. Rubin GD, Ryerson CJ, Haramati LB, et al. The Role of Chest Imaging in Patient Management during the COVID-19 Pandemic: A Multinational Consensus Statement from the Fleischner Society. 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