Related Experiment Video
Updated: Jul 12, 2026

Echocardiographic Evaluation of Atrial Communications before Transcatheter Closure
Published on: February 8, 2022
Atrioventricular septal defect with cor triatriatum sinister
Yu-Yin Liu1, Yao-Kuang Huang, Chi-Nan Tseng
1Division of Thoracic and Cardiovascular Surgery, Chang Gung Memorial Hospital, Taipei, ROC.
Insights
Cor triatriatum with complete atrioventricular septal defect is a rare congenital heart defect. This case study details successful surgical repair in an infant, achieving normal cardiac function post-operation.
Area of Science:
- Cardiology
- Congenital Heart Disease
- Pediatric Cardiac Surgery
Background:
- Cor triatriatum (CT) is a rare cardiac anomaly involving left atrial partitioning.
- Association of CT with atrioventricular septal defects (AVSD) is exceptionally uncommon.
- Few cases of CT combined with complete AVSD have been previously documented.
Observation:
- An 11-month-old female infant presented with a rare combination of complete atrioventricular septal defect and cor triatriatum.
- The infant underwent surgical correction for both cardiac anomalies.
Findings:
- The patient experienced an uneventful recovery following surgical intervention.
- Normal cardiac performance was successfully restored 2 years after the surgery.
Implications:
- This case highlights the feasibility of surgical correction for complex congenital heart defects like CT and complete AVSD in infants.
- Successful surgical outcomes underscore the importance of early diagnosis and intervention for rare cardiac anomalies.
- Further research into the management of combined CT and AVSD may improve clinical guidelines and patient outcomes.
Abstract:
Cor triatriatum (CT) is a rare cardiac anomaly, characterized by a membrane in the left atrium which separates the atrium into the proximal and distal chambers. Association of CT with atrioventricular septal defects (AVSD) is extremely rare; only three cases with complete AVSD and 10 with partial AVSD have been reported. In this study, we present an 11-month-old female infant with complete AVSD and cor triatriatum. The patient recovered uneventfully after surgery and normal cardiac performance was achieved 2 years later.
Related Concept Videos
Chambers of the Heart
Deoxygenated blood from the body is received in the right...
Mitral Stenosis I: Introduction
Mitral Regurgitation I: Introduction
Aortic Regurgitation I: Introduction
Heart Valves
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
Cardiomyopathy II: Dilated Cardiomyopathy

