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Case Reports in Cardiology
Volume 2018, Article ID 9242519, 3 pages
Case Report

Cor Triatriatum Sinister: An Unusual Cause of Atrial Fibrillation in Adults

1Section of Cardiology, University of Manitoba, Winnipeg, MB, Canada
2Section of Cardiology, University of Toronto, Toronto, ON, Canada
3Cardiac Sciences Program, St. Boniface Hospital, Winnipeg, MB, Canada

Correspondence should be addressed to Malek Kass;

Received 11 December 2017; Accepted 6 March 2018; Published 31 March 2018

Academic Editor: Tayfun Sahin

Copyright © 2018 Christopher Hayes et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Cor triatriatum is a rare congenital heart defect that is associated with an increased risk for developing atrial fibrillation. We report a case of a healthy 38-year-old man who presented in decompensated heart failure and atrial fibrillation with a rapid ventricular response. A transthoracic echocardiogram (TTE) demonstrated severe biventricular dysfunction and dilatation in addition to cor triatriatum sinister. He was diuresed with resolution of his symptoms and spontaneously converted back to sinus rhythm. There is limited evidence in the literature surrounding anticoagulation and associated left ventricular dysfunction in the setting of cor triatriatum which posed difficult therapeutic decisions.