138 Myocardial Fibrosis in Marathon Athletes: A Marker of Occult Coronary Artery Disease

Abstract

Several studies have correlated elevations in cardiac biomarkers of injury post marathon with transient and reversible right ventricular (RV) systolic dysfunction as assessed by both transthoracic echocardiography (TTE) and cardiac MRI (CMR). Whether or not permanent myocardial injury occurs due to repeated marathon running in the aging population remains controversial. To assess the extent and severity of cardiac dysfunction after the completion of full marathon running in individuals greater than 50 years of age using cardiac biomarkers, TTE, cardiac computed tomography (CCT), and CMR. A total of 25 healthy volunteers (21 males, 55±4 years old) from the 2010 and 2011 Manitoba Full Marathons (26.2 miles) were included in the study. Cardiac biomarkers and TTE were performed one week prior to the marathon, immediately after completing the race and at one-week follow-up. CMR was performed at baseline and within 24 hours of completion of the marathon, followed by CCT within 3 months of the marathon. All participants demonstrated an elevated cTnT post marathon. Right atrial and ventricular volumes increased, while RV systolic function decreased significantly immediately post marathon, returning to baseline values one week later. Of the entire study population, only two individuals demonstrated delayed enhancement of the subendocardium in the anterior wall of the left ventricle, with evidence of stenosis of the left anterior descending artery on CCT (Figure 1). The presence of myocardial fibrosis in marathon athletes is not due to repeated stress from endurance running, but may be a marker of occult coronary artery disease. (Figure 1).