1. 106 veteran male endurance athletes studied for arrhythmia.
2. Myocardial fibrosis found in 47.2% of participants.
3. Significant association between fibrosis and arrhythmic risk.
4. Median follow-up period: 720 days.
5. Most fibrosis localized in basal inferolateral left ventricle.
6. 21.7% of athletes experienced ventricular arrhythmias.
7. Further research needed on causality of fibrosis. 8. No conflicts of interest reported.

Source: Circulation: Cardiovascular Imaging