Orkun Canbolat
1* 
, Şeyma Yeşil
1 , Yelda Saltan Özateş
1 , Ufuk Yıldız
1 , Duygu Inan
1 , Alev Kılıcgedik
1 1 Department of Cardiology, Basaksehir Cam & Sakura City Hospital, Istanbul, Turkey
Abstract
Infective endocarditis complicated by a coronary sinus abscess is extremely rare and can lead to conduction issues. We report a 63-year-old hemodialysis patient with Methicillin-resistant Staphylococcus aureus infective endocarditis who developed complete atrioventricular block. Transesophageal echocardiography and cardiac computed tomography showed vegetations on the posterior mitral annulus, severe mitral regurgitation, and a coronary sinus abscess. Atrioventricular conduction recovered spontaneously, probably due to abscess drainage into the left atrium. Despite surgery, the patient died from cardiogenic shock. This case highlights the diagnostic and therapeutic challenges of periannular complications.