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Valve morphology in complete atrioventricular septal defect: variability relevant to operation
T Akiba1, A E Becker, R Neirotti
1Department of Cardiovascular Pathology, University of Amsterdam, Academic Medical Center, The Netherlands.
The Annals of Thoracic Surgery
|August 1, 1993
Summary
Surgical repair of atrioventricular septal defects requires understanding valve leaflet variability. Both anterior and posterior leaflet morphologies significantly impact surgical outcomes.
Area of Science:
- Cardiovascular Surgery
- Congenital Heart Disease
- Cardiac Anatomy
Background:
- Atrioventricular valve remodeling is critical for surgical repair of complete atrioventricular septal defects.
- Variability in valve morphology presents a significant challenge in achieving successful surgical outcomes.
Purpose of the Study:
- To evaluate the morphological variability of the anterior and posterior atrioventricular valve leaflets in adult heart specimens with complete atrioventricular septal defects.
- To assess the surgical relevance of observed leaflet variations for repair strategies.
Main Methods:
- Examination of 30 adult heart specimens with complete atrioventricular septal defects.
- Classification of anterior leaflet morphology based on Rastelli types (A, B, C).
- Detailed analysis and categorization of posterior leaflet morphology and its septal attachments.
Main Results:
- Anterior bridging leaflet variations included Rastelli types A (12), B (2), and C (16).
- Posterior leaflet morphology exhibited four patterns, with common posterior leaflets attached by chordae (13) or free-floating (11) being most frequent.
- No correlation was found between anterior and posterior leaflet classifications.
- Surgically relevant variations in chordal arrangement from the right septal side were noted.
Conclusions:
- Significant morphological variability exists in both anterior and posterior atrioventricular valve leaflets in complete atrioventricular septal defects.
- Posterior leaflet morphology and its septal attachments are crucial considerations for successful surgical repair, alongside anterior leaflet variations.
- Categorization of posterior leaflet variations aids in distinguishing hearts with or without interventricular communication beneath the leaflet, informing surgical approach.