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Analysis of atrioventricular junction, ventricular mass, and ventriculoarterial junction in 43 specimens with atrial
Insights
Congenital heart defects involving isomeric atrial chambers show distinct differences. Right atrial isomerism is more frequently associated with pulmonary obstruction and univentricular hearts compared to left atrial isomerism.
Area of Science:
- Cardiovascular Pathology
- Pediatric Cardiology
- Congenital Heart Disease
Background:
- Atrial isomerism, a condition where atrial appendages are morphologically similar, presents unique challenges in cardiovascular development.
- Understanding the spectrum of cardiac anomalies associated with right and left atrial isomerism is crucial for diagnosis and management.
- Previous studies have highlighted variations in atrioventricular and ventriculoarterial connections, but comprehensive analysis across different isomerism types is needed.
Purpose of the Study:
- To analyze the atrioventricular junction, ventricular mass, and ventriculoarterial junction in hearts with isomeric atrial chambers.
- To compare the prevalence of specific cardiac malformations between right atrial isomerism and left atrial isomerism.
- To identify statistically significant differences in cardiac morphology and connections between these two groups.
Main Methods:
- Retrospective analysis of 43 hearts with isomeric atrial chambers.
- Detailed examination of atrioventricular junction, ventricular morphology, and ventriculoarterial junction.
- Statistical comparison of cardiac features between hearts with right atrial isomerism (32 cases) and left atrial isomerism (11 cases).
Main Results:
- Right atrial isomerism was significantly associated with a higher frequency of pulmonary obstruction and univentricular hearts compared to left atrial isomerism.
- Diverse atrioventricular connections (common valve, two valves, absent connection) and ventricular morphologies were observed in both groups.
- Significant differences were found in ventriculoarterial connections and infundibular morphology between right and left atrial isomerism groups.
Conclusions:
- Right atrial isomerism carries a higher risk of pulmonary obstruction and univentricular heart morphology than left atrial isomerism.
- The study reveals significant variations in cardiac connections and morphology within each isomerism type, underscoring the complexity of these congenital defects.
- These findings contribute to a better understanding of the spectrum of cardiac anomalies in atrial isomerism, aiding in clinical diagnosis and surgical planning.
Abstract:
We have analysed the atrioventricular junction, ventricular mass, and ventriculoarterial junction in 43 hearts with isomeric atrial chambers. Of the hearts, 32 had atrial chambers of bilateral right morphology while 11 had atrial chambers with bilateral left atrial characteristics. Among the hearts with right atrial isomerism, there were 13 biventricular hearts, all with ambiguous atrioventricular connection. Eight had a common valve and five had two atrioventricular valves. In the other 19 hearts, the atrial chambers were connected to only one ventricular chamber, 18 having double inlet ventricle through a common valve and the other having absence of the left atrioventricular connection. In these univentricular hearts, all possible types of ventricular morphology were found. The ventriculoarterial junction among these hearts with right isomerism showed great variation. In the hearts with left atrial isomerism, nine hearts had two ventricles and two were univentricular. The biventricular hearts all had ambiguous atrioventricular connection, six via a common valve and three via two valves. The two univentricular hearts both had double inlet via a common valve, one to a chamber of right ventricular type and the other to a chamber of left ventricular type. Both had rudimentary chambers of complementary pattern. The ventriculoarterial junction again showed much variation. Statistical analysis showed that pulmonary obstruction and a univentricular heart were both significantly more frequent in association with right compared with left isomerism. Significant differences were also noted in the two groups in terms of ventriculoarterial connections and infundibular morphology.