Correlations between CT-assessed vascular inflammation at different levels of the coronary circulation and the risk of atrial fibrillation

Abstract Funding Acknowledgements Type of funding sources: Public grant(s) – EU funding. Main funding source(s): This work was supported by the George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Târgu Mureș, Research Grant number 510/5/17.01.2022 This research has been funded by the research grant Intel-FAT, proposal registration code PN-III-P4-ID-PCE-2020-2861, contract number PCE 206/2021, Project funded by the European Union and the Government of Romania through the Ministry of European Funds, and the Doctoral School of the “George Emil Palade” University of Medicine, Pharmacy, Science and Technology of Târgu Mureș, Romania. Background Atrial fibrillation (AF) may occur any time in the evolution of various cardiovascular diseases, most of them having an inflammatory substrate. Perivascular inflammation may be assessed nowadays using coronary computed tomography angiography (CCTA) imaging. The new pericoronary fat attenuation index (FAI HU) and the FAI Score (an individualized quantification of coronary artery inflammation adjusted for age and gender) have prognostic value for predicting future cardiovascular events. Purpose The aim of our study was to investigate the correlation between pericoronary fat inflammation and the presence of atrial fibrillation among patients with coronary artery disease. We also compared the CA-Ri Heart Risk derived from the FAI Score values, the plaque burden and other clinical risk factors in patients with AF versus those in sinus rhythm. Methods In total, 81 patients (mean age 64.75 ± 7.84 years) who performed 128- slice CCTA were included in the study and divided them in two groups: group 1: 36 patients with documented AF, and group 2: 45 patients without known history of atrial fibrillation. For each patient demographyc characteristics, comorbidities and cardiovascular risk factors, echocardiography findings and lab tests were recorded and the FAI and FAI score were calculated. Results The CaRI Heart Risk was not significantly different between the two groups (18.14±14.09 vs. 18.09±13.59, p = ns). There were no significant differences in the absolute value of fat attenuation between the study groups (p>0.05). However, mean FAI Score was significantly higher in patients with AF (15.53 ± 10,29 vs. 11.09±6,70, p<0.05). Regional analysis of coronary inflammation indicated higher levels of inflammation especially at the level of the left anterior descending artery (13.17 ± 7,91 in group 1 vs 8.80 ± 4,75 in group 2, p = 0.008). Conclusions Patients with AF present a higher level of inflammation in the epicardial fat surrounding coronary arteries especially at the level of the left coronary circulation. A high inflammation at this level seems to be associated with a higher risk of atrial fibrillation development.