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Morphology of ventricular septal defect associated with coarctation of aorta
Insights
Congenital heart defects like coarctation and ventricular septal defect can impede fetal aortic blood flow. This study examined heart specimens to understand the anatomical basis of this potential compromise.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Disease
- Cardiac Morphology
Background:
- Interrupted aortic arch (IAA) with ventricular septal defect (VSD) is known to compromise ascending aorta blood flow.
- A similar mechanism has been hypothesized for coarctation of the aorta (CoA) with VSD, but lacks necropsy evidence.
Purpose of the Study:
- To investigate the morphology of VSD in hearts with coarctation and VSD.
- To determine if anatomical features suggest compromised aortic blood flow during fetal development.
Main Methods:
- Retrospective necropsy study of 25 human hearts.
- Hearts were sourced from the Heart Museum of Children's Hospital of Pittsburgh.
- Detailed examination of VSD morphology, left ventricular outflow tract, and associated cardiac anomalies.
Main Results:
- Four cases exhibited malalignment VSD with left ventricular outflow tract obstruction, similar to IAA.
- Twenty cases presented with perimembranous VSD and aortic overriding, with tricuspid valve tissue partially obstructing the defect.
- Additional left ventricular outflow tract narrowing and mitral valve malformations were observed in several cases.
Conclusions:
- The observed cardiac anatomy in coarctation with VSD suggests a potential reduction in fetal aortic blood flow.
- Further clinical evaluation is needed to understand the implications of these morphological findings.
Abstract:
It is now well established that the morphology of the ventricular septal defect associated with interrupted aortic arch is such as to compromise blood flow to the ascending aorta. Though there is some evidence that a similar mechanism may be operative in coarctation with ventricular septal defect, we are unaware of any necropsy study of this hypothesis. We therefore studied 25 hearts from the Heart Museum of Children's Hospital of Pittsburgh with coarctation and ventricular septal defect. Four had a malalignment defect with left ventricular outflow tract obstruction such as is seen in cases with interruption. Twenty of the remaining cases had a particular form of perimembranous defect with aortic overriding. The defects were partially closed by tricuspid valve tissue, the left ventricular outflow tract being further narrowed by various anatomical lesions. In addition, mitral valve malformations were present in 14 cases. The anatomy of the group as a whole suggests a possible reduction of aortic blood flow during fetal development. The clinical implications of these findings remain to be evaluated.