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The cross sectional anatomy of ventricular septal defects: a reappraisal
E J Baker1, M P Leung, R H Anderson
1Division of Cardiology, Children's Hospital, Pittsburgh, Pennsylvania.
Insights
Accurate anatomical description of ventricular septal defects (VSDs) using cross-sectional imaging is crucial. This study identified key features for precise VSD morphology assessment, improving diagnostic clarity.
Area of Science:
- Cardiovascular Imaging
- Pediatric Cardiology
- Cardiac Anatomy
Background:
- Existing classifications for ventricular septal defects (VSDs) are complex and often unsatisfactory.
- Accurate anatomical description from cross-sectional images is paramount for understanding VSDs.
- Previous methods lacked a standardized approach to VSD morphology assessment.
Purpose of the Study:
- To identify valuable features for interpreting cross-sectional echocardiographic images of VSDs.
- To establish criteria for precise anatomical description of VSDs.
- To determine the applicability of these criteria across various complex congenital heart conditions.
Main Methods:
- Review of 100 heart specimens with VSDs.
- Analysis of cross-sectional echocardiographic features.
- Classification of VSDs into three main anatomical groups based on their margins.
- Identification of VSD location relative to ventricular inlets and outlets.
Main Results:
- Three distinct VSD groups were identified: abutting the central fibrous body, with fibrous continuity, and entirely muscular margins.
- Specific cross-sectional features allowed for ready discernment of these groups.
- VSDs were further categorized by their location: inlet, outlet, or trabecular.
- The established descriptive criteria proved applicable across diverse congenital heart anomalies.
Conclusions:
- Cross-sectional imaging, particularly echocardiography, offers detailed and precise VSD morphology description.
- A classification-independent approach focusing on anatomical features enhances diagnostic accuracy.
- The identified criteria provide a robust framework for describing VSDs in various cardiac contexts.
Abstract:
The cross sectional echocardiographic description of holes in the ventricular septum has been unsatisfactory, chiefly because there are so many classifications of this defect. The accurate description of the anatomy of individual defects, from cross sectional images, is more important than attempts to fit them into a preconceived classification. One hundred specimens of hearts with a ventricular septal defect were reviewed to identify those features that are of value in the interpretation of cross sectional images. Three groups of defect were identified: those which abutted the central fibrous body, those with a margin partly formed by an area of fibrous continuity between the leaflets of the aortic and pulmonary valves, and those with entirely muscular margins. Each group had features that were readily discernible in cross section. Other features of the defects seen in the cross sectional images identified defects that opened between the two ventricular inlets, defects that opened between the two subarterial outlets, and those that extended solely into the trabecular septum. The criteria for describing the anatomy of defects were established in hearts with normal connections, but they were found to be equally applicable in hearts with discordant atrioventricular connection, discordant ventriculoarterial connection, common arterial trunk, and double outlet from the morphologically right ventricle. Cross sectional imaging, by echocardiography and potentially by other techniques, provided a uniquely detailed and precise description of the morphology of ventricular septal defects.