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• W3202397064 abstract "Long COVID is defined by the French National Health Authority as persisting symptoms more than 4 weeks after COVID-19 [[1]Symptômes prolongés suite à une Covid-19 de l’adulte – diagnostic et prise en charge. Haute Aut Santé.https://www.has-sante.fr/jcms/p_3237041/fr/symptomes-prolonges-suite-a-une-covid-19-de-l-adulte-diagnostic-et-prise-en-chargeDate accessed: September 2, 2021Google Scholar]. Recently, Sollini et al. described an increased 18F-FDG vascular uptake in six patients with long COVID [[2]Sollini M. Ciccarelli M. Cecconi M. Aghemo A. Morelli P. Gelardi F. et al.Vasculitis changes in COVID-19 survivors with persistent symptoms: an [18F]FDG-PET/CT study.Eur J Nucl Med Mol Imag. 2021; 48: 1460-1466Crossref PubMed Scopus (70) Google Scholar]. We retrospectively searched for vascular hypermetabolism among patients consulting for long COVID who had a whole body 18F-FDG positron emission tomography/computed tomography (PET/CT) as part of routine exploration. This retrospective study was approved by the hospital board (AP-HM) on reference PADSVJWVK7, and data extracted respecting the French GPDR (General Data Protection Regulation). One hundred and sixteen patients consulted for long COVID in our centre between May and December 2020. Fifty-one patients had 18F-FDG PET/CT, two were excluded because no proof of SARS-CoV2 infection was available and two because of a lack of clinical data, resulting in a cohort of 47 patients. The 47 patients had persisting symptoms more than 4 four weeks after a positive RT-PCR nasopharyngeal test for SARS-CoV-2 infection (70% with dyspnoea, 27% with hyposmia/anosmia, 19% with dysgeusia/ageusia, 27% with chest pain, 53% with cognitive disorders and 36% with sleeping disorders). 18F-FDG PET/CT were acquired in fasting subjects for at least 6 hr with a controlled glycaemic level, using GE discovery 710 PET/CT, 60 min after intravenous administration of 3 MBq/kg of 18F-FDG. Comparative analyses were done using the Fisher exact test with SPSS Statistics Software 20. Aortic hypermetabolism was visually detected in ten patients, with an aortic mean Standardized Uptake Value (SUVmax) measured at 3.36 (SD = 0.63) (Fig. 1). The thoracic aorta segment was involved in all patients. Abdominal aortic hypermetabolism was additionally found in three patients. Five patients were checked with a second 18F-FDG PET/CT scan (mean delay 152 days). Four out of five showed persistent aortic hypermetabolism. The mean aortic SUVmax in the ten aortic hypermetabolism patients was higher than in the 37 non-aortic hypermetabolism patients (3.36, SD 0.63; and 2.51, SD 0.18, respectively, p 0.002). Three out of ten patients had a thoracic CT angiography to measure aortic diameters and volumes. No significant parietal thickening on the ascending or descending thoracic aorta nor on the abdominal aorta was found on CT angiography. The group of ten patients with aortic hypermetabolism was composed of six women (6/10), with mean age of 55 years (44–71), and mean body mass index (Kg.m-2) of 25 (23–29). Five patients were smokers (one active and four former smokers). One patient had high blood pressure and one patient had past cardiovascular events (arrythmia and stroke). Three patients had chest pain during acute COVID-19 (3/9), one patient had dyspnoea (1/9), and one had a severe lesion on chest CT scan (1/7). The clinical features of long COVID were dyspnoea (7/10), chest pain (6/10) and cognitive complains (6/10). When compared with the 37 controls with negative aortic PET, we found significant differences regarding tobacco smoking at baseline (5/10; 50% vs. 31/37; 83%, p 0.04), dyspnoea during the acute stage (1/9; 11% vs. 19/36; 52%, p 0.03), persistent ageusia (0/10 vs. 14/37; 38%, p 0.02) and persistent chest pain (6/10; 60% vs. 7/37; 19%, p 0.017). No other significant differences were found between the two groups. Biologically, all patients had a normal C-reactive protein rate, and we performed Treponema pallidum serology on six patients, and all were negative. In summary, we retrospectively found aortic hypermetabolism in ten out of 47 patients with long COVID who had an 18F-FDG PET/CT scan, with more frequent chest pain in this group (6/10; 60% vs. 7/37; 19%, p 0.017). The high proportion of aortic hypermetabolism in our cohort (21%) makes us think that this phenomenon is not incidental. To have an idea of the prevalence of an incidental finding of thoracic aortic hypermetabolism, we compared thoracic aortic uptakes between our long COVID patients, and a non-COVID-19 control group of 20 randomly selected patients with negative SARS-CoV-2 RT-PCR and serology, who had an 18F-FDG PET/CT scan for oncological indications. No patients in this control group had visually detected aortic hypermetabolism and comparative analysis with a non-parametric Kruskall–Wallis test showed significant differences in mean aortic SUVmax between our ten patients with aortic hypermetabolism and the non-COVID-19 control group (3.36, (SD 0.63) and 2.15 (SD 0.59), respectively; p < .0001). This study is retrospective and, consequently, suffers from several biases. No previous 18F-FDG PET/CT scan was available for the patients, and we could not exclude the possibility that some had a pre-existing aortic hypermetabolism. Nonetheless, they had no more cardiovascular risks factors than the controls, including tobacco and age, suggesting that aortic hypermetabolism was probably not due to previous unknown atherosclerotic lesions. However, we found significant differences between small groups of patients, and the relevance of our results needs to be confirmed by further studies on larger samples. We nevertheless confirm the findings of Sollini et al. and of four other case reports showing signs of thoracic aortitis after SARS-Cov2 infection, all presenting with chest pain, reinforcing the hypothesis of SARS-COV 2 post-infectious aortic inflammation [3Shergill S. Davies J. Bloomfield J. Florid aortitis following SARS-CoV-2 infection.Eur Heart J. 2020; 41: 4286Crossref PubMed Scopus (14) Google Scholar, 4Zou Y. Vasta B. EP14 COVID-19 associated aortitis.Rheumatol Adv Pract. 2020; 4rkaa052.013Crossref Google Scholar, 5Salvat Dávila C. Suárez Fernández J.P. Domínguez Grande M.L. Vigil Díaz C. Fernández Llana B. Martín Fernández N. et al.SARS-CoV-2 (COVID-19) pneumonia: incidental finding on 18F-FDG PET/CT study for vasculitis diagnosis.Rev Espanola Med Nucl E Imagen Mol. 2021; 40: 251-252PubMed Google Scholar, 6Sollini M. Morbelli S. Ciccarelli M. Cecconi M. Aghemo A. Morelli P. et al.Long COVID hallmarks on [18F]FDG-PET/CT: a case-control study.Eur J Nucl Med Mol Imag. 2021; 48: 3187-3197Crossref PubMed Scopus (75) Google Scholar]. Supported by the SARS-CoV-2 pathophysiological mechanism of entry, which uses the ACE2 receptor present on endothelial cells, evidence of SARS-CoV2 virions inside vascular tissues is now emerging [[7]Evans P.C. Rainger G.E. Mason J.C. Guzik T.J. Osto E. Stamataki Z. et al.Endothelial dysfunction in COVID-19: a position paper of the ESC working group for atherosclerosis and vascular biology, and the ESC council of basic cardiovascular science.Cardiovasc Res. 2020; 116: 2177-2184Crossref PubMed Scopus (265) Google Scholar]. Nonetheless, it is still not clear whether this FDG/PET inflammation means active endothelial viral replication, passive viral persistence without endothelial damage, post-infectious aortic inflammation mechanism or sequelae. 18F-FDG PET/CT thoracic aortic hypermetabolism found in primary syphilitic infection, long before the development of aortic aneurysm, looks very similar to the images we found in COVID-19-infected patients, suggesting similar pathogenesis [[8]Joseph Davey D. Kojima N. Konda K.A. Gupta P. Leon S.R. Calvo G.M. et al.Transient aortitis documented by positron emission tomography in a case series of men and transgender women infected with syphilis.Sex Transm Infect. 2017; 93: 551-555Crossref PubMed Scopus (6) Google Scholar]. There is a need for close long-term follow-up of these patients with aortic hypermetabolism, to understand whether the inflammation that we observed is a sequela or an ongoing process, with possible emergence of an aortic aneurysm or dissection, years after acute infection. CT angiography should be performed at follow-up to identify if morphological changes occur in the aortic wall of these patients. Further prospective multicentric studies are needed to better understand the risk factors and prognosis of post-COVID-19 thoracic aortic inflammation. The authors declare that they have no conflicts of interest. No external funding was received for this study. Pierre Dudouet proceeded to patient examination, wrote the first draft, revised the present MS, collected and analysed data; Serge Camilleri and Eric Guedj interpreted the results of the 18F-FDG PET/CT scan and wrote the nuclear imaging part of the MS; Alexis Jacquier interpreted and wrote the aortic CT angiography part of the MS; Didier Raoult revised the different versions of the MS; Carole Eldin designed the work, performed the statistical analyses and revised the different versions of the MS. Use of all data was secured by password protection of all folders, and was approved by the legal General Data Protection Regulation team from the “Assistance Publique des Hôpitaux de Marseille”, the Marseille university hospital as a retrospective study without need of ethics committee declaration in current French regulatory rules. Specific Secure Data Access Portal was created with the number VJWVK7." @default.
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• W3202397064 title "Aortic 18F-FDG PET/CT hypermetabolism in patients with long COVID: a retrospective study" @default.
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