Study population
Among 72 patients who had CRT implantation were reviewed. 30 of them who had another indication for transeosephageal echocardiography ( E.g. grading mitral regurgitation, trombus search etc.) and moderate to severe mitral regurgitaion were included to the study.
Patients with rheumatic mitral valve disease, severe annular calcifications, mitral valve prolapse and a history of mitral valve repair or replacement and those with inadequate acoustic windows were excluded from the study. Informed consent was obtained from the patients and approval from Clinical Investigation Ethics Committee in accordance with principles of Helsinki Declaration.