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Cross-sectional echocardiographic assessment of atrioventricular septal defect: basic morphology and preoperative
1Department of Pediatrics, The University of Toronto, Ontario, Canada. jsmallho@sickkids.on.ca
Insights
Echocardiography accurately evaluates atrioventricular septal defects by identifying common cardiac features and key risk factors like valve abnormalities. This imaging is crucial for surgical planning, often negating the need for further tests.
Area of Science:
- Cardiology
- Medical Imaging
- Pediatric Heart Disease
Background:
- Atrioventricular septal defects (ASDs) are congenital heart conditions requiring precise evaluation.
- Echocardiography is the primary diagnostic tool for assessing these defects.
Purpose of the Study:
- To detail the common morphological features of atrioventricular septal defects.
- To outline critical associated risk factors for surgical management identified via echocardiography.
Main Methods:
- Review of echocardiographic findings in patients with atrioventricular septal defects.
- Focus on identifying specific anatomical characteristics and associated lesions.
Main Results:
- Common features include inlet-outlet disproportion, absent atrioventricular muscular septum, abnormal papillary muscle position, abnormal atrioventricular valves, and left atrioventricular valve cleft.
- Key risk factors for surgical management are left atrioventricular valve abnormalities and left ventricular outflow tract obstruction.
Conclusions:
- Echocardiography provides comprehensive evaluation of atrioventricular septal defects.
- Identification of specific features and risk factors guides surgical planning, minimizing the need for additional investigations.
Abstract:
Accurate evaluation of an atrioventricular septal defect is readily achieved by echocardiography. A sound understanding of the basic morphology and associated lesions is key to this approach. This article first details the features that are common to all hearts with an atrioventricular septal defect, irrespective of the presence or absence of an interatrial or interventricular communication. These common features are: (1) inlet outlet disproportion; (2) absence of the atrioventricular muscular septum; (3) abnormal position of the left ventricular papillary muscles; (4) abnormal configuration of the atrioventricular valves and, (5) cleft in the left atrioventricular valve. These are all predicated by a sprung atrioventricular junction. Second, is a detailed outline of the associated risk factors that must be identified by the echocardiographer prior to presenting the patient for surgical management, with the most important ones being abnormalities of the left atrioventricular valve and left ventricular outflow tract obstruction. Indeed, in this current era it is rarely necessary to perform other investigations prior to surgical repair.