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Persistent truncus arteriosus: pathologic anatomy in 54 cases
Insights
This study details anatomical variations in persistent truncus arteriosus (PTA), identifying a novel unicommissural truncal valve and common associated cardiovascular anomalies.
Area of Science:
- Cardiovascular Anatomy
- Congenital Heart Disease
- Pediatric Cardiology
Background:
- Persistent truncus arteriosus (PTA) is a complex congenital heart defect.
- Understanding its anatomical variations is crucial for surgical planning and patient outcomes.
Purpose of the Study:
- To anatomically characterize a cohort of persistent truncus arteriosus (PTA) specimens.
- To document the prevalence of different PTA types, truncal valve morphology, ventricular origin, coronary artery patterns, and associated anomalies.
Main Methods:
- Anatomical review of 54 heart specimens with persistent truncus arteriosus (PTA).
- Classification based on the Collett-Edwards system.
- Detailed examination of truncal valve, ventricular origin, coronary arteries, and associated cardiovascular anomalies.
Main Results:
- 28 Type I and 26 Type II PTA cases identified.
- A previously unreported unicommissural truncal valve was observed.
- Dysplastic truncal valve leaflets were common (72%).
- PTA originated equally from both ventricles (42%) or predominantly from the right ventricle (42%).
- Variations in coronary artery origins and patterns were frequent.
- Common associated anomalies included right aortic arch (36%) and interrupted aortic arch (11%).
Conclusions:
- Persistent truncus arteriosus (PTA) exhibits significant anatomical variability.
- The unicommissural truncal valve represents a novel finding.
- Specific ventricular origins may pose challenges for surgical correction.
- Associated anomalies like right aortic arch and interrupted aortic arch are frequent and require careful consideration.
Abstract:
Fifty-four specimens of heart with persistent truncus arteriosus (PTA) were reviewed anatomically. According to the Collett-Edwards classification there were 28 examples of type I and 26 type II. The sex distribution was equal. The number of the truncal cusps ranged from one to four (42% tricuspid, 30% bicuspid, 24% quadricuspid, and 4% unicommissural). A unicommissural truncal valve has not been previously reported. In 72% of cases, the truncal valve leaflets were thickened or dysplastic. Two valves were stenotic. The truncus arteriosus originated from both ventricles equally in 42% of the cases, predominantly from the right ventricle in 42%, and predominantly from the left ventricle in 16% of the cases. In unoperated cases of PTA originating predominantly from the right ventricle, it appeared to us that usual operative correction might result in left ventricular outflow obstruction. Variations in coronary arterial origins and patterns were present in nearly half of the cases. A single coronary artery was observed in ten cases (18.5%). Stenosis of the ostium of one coronary artery was seen in each of four cases (7%). High posterior origin of the left coronary artery was observed in ten cases (18.5%). Among the associated cardiovascular anomalies, the most common were right aortic arch (36%) and interruption of the aortic arch (11%). Three cases with the latter condition exhibited crossed pulmonary arteries. Isolated cases with tricuspid atresia, vascular sling (left pulmonary artery arising from right pulmonary artery), and persistent common atrioventricular canal were encountered.