Epicardial Fat Thickness Assessment by Echocardiography and Its Association with Cag Findings in Patients Suspected of Cad in A Tertiary Care Hospital in India
Background: Epicardial fat lies in close proximity to myocardium, and its metabolic activity correlates with the heart and coronary vessels. Epicardial fat thickness (EFT) reflects visceral adiposity rather than general obesity. It correlates with metabolic syndrome, insulin resistance, coronary artery disease (CAD), and subclinical atherosclerosis; therefore, it may serve as a simple tool for cardiometabolic risk prediction. Echocardiographic measurement of EFT is low-cost, rapid, and reproducible. Prior studies have shown conflicting results regarding correlation of EFT with severity of coronary stenosis. Hence, this study evaluated the hypothesis that echocardiographic EFT correlates with CAD severity. Objectives: To assess the association between epicardial fat thickness measured using transthoracic echocardiography and CAD severity by coronary angiography (modified Gensini score). Methods: A single-centre observational cross-sectional study conducted in the Department of Cardiology, Government Medical College, Kozhikode. Patients undergoing coronary angiography for suspected CAD (meeting inclusion criteria) were enrolled. All patients underwent clinical evaluation, ECG, 2D echocardiography with EFT measurement, and coronary angiography. Results: A total of 151 patients were included (mean age 53.4 years; 74.8% male). Of these, 53 (35.1%) had normal CAG and 97 (64.9%) had CAD. Normal CAG patients showed good LV function in 96.2% vs 36.7% in CAD patients; LV dysfunction was significantly more common in CAD (60.2%, p = 0.001). Among CAD patients, single-vessel disease (SVD) was found in 33.8%, double-vessel disease (DVD) in 18.5%, and triple-vessel disease (TVD) in 11.9%. Risk factors (DM, HTN, smoking, BMI) were not significantly different between groups. Mean Gensini score was 0 in normal vs 5.8 in CAD. Mean EFT was 3.2 mm in normal vs 7.1 mm in CAD patients (p < 0.001). EFT increased stepwise with CAD severity: SVD 6.56 mm, DVD 7.56 mm, TVD 7.82 mm vs 3.2 mm in normal (p < 0.001). Dyslipidemia patients had higher EFT (7.89 mm) than those with normal lipids (6.22 mm). Conclusion: Echocardiographic EFT was significantly higher in CAD patients than in those with normal coronaries and correlated with the severity of CAD (SVD/DVD/TVD). EFT is a simple, low-cost marker of coronary artery stenosis severity