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The horizontal interventricular septum. Three cases with different ventriculoarterial connections
Insights
A horizontal interventricular septum is an independent cardiac deformity. This condition can occur with various great artery connections and is linked to early heart development.
Area of Science:
- Embryology
- Cardiovascular Anatomy
- Developmental Biology
Background:
- The development of the cardiac septa is crucial for normal heart function.
- Variations in cardiac morphology can arise from disruptions during embryonic development.
- Understanding congenital heart defects requires detailed analysis of anatomical and developmental processes.
Observation:
- Three cases of hearts with a horizontal interventricular septum were analyzed.
- These cases presented with different great vessel origins and connections, including dual right ventricular origin and a single aortic trunc.
- The horizontal septum was observed across diverse ventriculoarterial connections.
Findings:
- The horizontal interventricular septum is identified as a distinct cardiac malformation.
- This anomaly can coexist with various types of ventriculoarterial connections.
- The morphology can be explained by the rotation of the bulboventricular loop during embryogenesis, specifically a restraightening process of the cardiac tube.
Implications:
- A classification system can be developed for horizontal septa, incorporating ventricular arrangement.
- This finding aids in understanding the spectrum of congenital heart disease.
- Further research into cardiac looping abnormalities can elucidate other complex heart malformations.
Abstract:
Three hearts sharing the anatomical peculiarity of a horizontal interventricular septum are described. In one, both great vessels originate from the superior right ventricle, in the other the great arteries are connected normally, the third one shows a single aortic trunc. It is concluded that the horizontal interventricular septum has to be considered as an independent cardiac deformity occurring with most types of ventriculoarterial connections. Assuming rotation of the bulboventricular loop around a base-apex-axis as the basic ontogenetic event one can trace this morphology back to its original layout. It is, therefore, possible to classify each case according to the usual nomenclature regarding the horizontal septum and the upstairs-downstairs arrangement of the ventricles as an addition. This embryological event of rotation is considered the product of a restraightening process of the previously looped cardiac tube.