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Updated: Oct 13, 2026

Murine Fetal Echocardiography
Published on: February 15, 2013
The relationship between single ventricle and small outlet chamber and straddling and displaced tricuspid orifice and
Insights
This study differentiates single ventricle, small outlet chamber, and straddling or displaced tricuspid valve anomalies. Understanding these complex congenital heart defects is crucial for surgical planning.
Area of Science:
- Congenital Heart Disease
- Pediatric Cardiology
- Cardiac Anatomy
Background:
- Congenital heart defects present diverse anatomical challenges.
- Accurate differentiation of complex cardiac anomalies is essential for effective treatment.
Purpose of the Study:
- To delineate the distinct anatomical features of single ventricle, small outlet chamber, and straddling or displaced tricuspid valve.
- To provide insights into the embryologic origins of these conditions.
- To highlight the surgical relevance of these anatomical variations.
Main Methods:
- Comparative anatomical analysis of cardiac malformations.
- Review of existing literature on congenital heart disease.
- Embryologic speculation on developmental pathways.
Main Results:
- Single ventricle: Both atrioventricular orifices enter a common chamber.
- Small outlet chamber: Represents the right ventricular infundibulum.
- Straddling/Displaced Tricuspid Valve: Involves abnormal partitioning and chamber content of primitive ventricles.
Conclusions:
- Distinct anatomical differences exist between these congenital heart anomalies.
- Understanding these differences is critical for surgical intervention in pediatric cardiac patients.
- Embryologic insights may explain the development of these complex defects.
Abstract:
This paper deals with the anatomic differences between single ventricle and small outlet chamber, straddling tricuspid orifice and valve, and displaced tricuspid orifice and valve. In single ventricle, both atrioventricular orifices enter a chamber which contains the sinuses of both definitive ventricles, while a small outlet chamber represents the definitive infundibulum of the right ventricle. In straddling tricuspid orifice and valve, the primitive left ventricle contains the sinus of the definitive infundibulum of the right ventricle. In straddling tricuspid orifice and valve, the primitive left ventricle contains the sinus of the definitive left ventricle and also a portion of the sinus of the definitive right ventricle. The primitive right ventricle contains the infundibulum and part of the sinus of the definitive right ventricle. In displaced tricuspid orifice, the primitive left ventricle contains the sinus of the definitive left and almost all of the sinus of the definitive right ventricle. However, a posterior ventricular septum is formed, so that a portion of sinus or apical recess of the definitive right ventricle is included in the primitive right ventricle together with its infundibulum. Possible embryologic speculations are offered to account for these entities. The differences in the anatomy of these entities may be important to the surgeon.
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