Transoesophageal echocardiographic assessment of fixed subaortic obstruction in children

Area of Science:

• Pediatric Cardiology
• Echocardiography
• Congenital Heart Disease

Background:

• Fixed left ventricular outflow tract stenosis is a critical condition in pediatric cardiology.
• Accurate assessment of these lesions is vital for effective management and surgical planning.

Purpose of the Study:

• To determine the clinical utility of transoesophageal echocardiography (TOE) for evaluating fixed left ventricular outflow tract stenosis in pediatric patients.
• To compare the effectiveness of TOE with traditional precordial echocardiography in this population.

Main Methods:

• Prospective assessment of nine children (aged >5 years) with fixed subaortic or subpulmonary stenosis.
• Utilized both precordial and transoesophageal echocardiography for imaging the left ventricular outflow tract.

Main Results:

• Transoesophageal echocardiography provided significantly clearer images of the left ventricular outflow tract compared to precordial echocardiography in most patients.
• TOE revealed crucial details about lesion nature, extent (e.g., circumferential), and relationship to the aortic valve, which were not evident with precordial imaging.
• Transoesophageal Doppler offered no additional benefit for assessing aortic regurgitation or gradients.

Conclusions:

• Transoesophageal echocardiography is a valuable tool for visualizing left ventricular outflow tract lesions in children and adolescents, especially when precordial echocardiography is inadequate.
• The technique is useful for intraoperative assessment, defining the full extent of obstructive lesions, and evaluating residual disease post-surgery.