PO-01-087 A RARE CASE OF BI-ATRIAL FDG-UPTAKE: PRESENTING AS NEW ONSET ATRIAL FIBRILLATION

Isolated atrial myocarditis is rare, with presenting symptoms that are non-specific. Prior reports have suggested association arrythmias and increased risk of stroke due to dysfunction. Fluorodeoxyglucose (FDG)-positron emission tomography (PET) CT scan considered as a goal standard test for the diagnosis myocarditis. To present case highlighting isolated had higher incidence oral anticoagulation should be in such cases. N/A A 55yo male no prior medical history presented non-specific fatigue, shortness breath frequent palpitations. He underwent 2D echocardiogram showed LVEF 50-55% mild bi-atrial dilatation regional wall motion abnormalities was diagnosed incidental fibrillation during procedure. referred cardiac electrophysiology further work up. During his initial EP clinic visit, 12 lead ECG demonstrated normal sinus rhythm premature contractions ventricular contractions. Due symptomatic, dual chamber arrythmias, MRI (CMR) FDG-PET ordered rule out The CMR negative any LGE however, high-fat dietary preparation revealed uptake on walls (figure) interatrial septum SUV max 3.1. There LV myocardial FDG noted. Patient started dronedarone, OAC (CHADS2VASc =0) prophylaxis immunosuppressive therapy (methotrexate low dose prednisone). Invasive biopsy not good response therapy. an uncommon presentation acute associated arrythmias. PET-CT or imaging may useful aid diagnosis. Long-term need investigations. prophylaxis, despite CHADS2VASc unknown long-term implications