Ventricular volume characteristics of single ventricle before corrective surgery

Area of Science:

• Cardiology
• Pediatric Cardiology
• Congenital Heart Disease

Background:

• Single ventricle is a complex congenital heart defect requiring specialized management.
• Understanding ventricular dynamics is crucial for surgical planning and patient outcomes.

Purpose of the Study:

• To assess ventricular cavity volume and function in patients with single ventricle before surgical correction.
• To investigate the influence of pulmonary blood flow and atrioventricular valve regurgitation on ventricular characteristics.

Main Methods:

• Biplane cineangiocardiograms were used to measure ventricular cavity volumes in 17 single ventricle patients.
• End-diastolic volume index and ejection fraction were calculated.
• Correlation analysis was performed to assess relationships between volume, flow, and valve function.

Main Results:

• End-diastolic volume index averaged 131 ml/m², significantly higher than normal values.
• A high correlation (r = +0.89) was found between end-diastolic volume index and pulmonary to systemic flow ratio.
• Ventricular function was depressed, particularly in patients with atrioventricular valve regurgitation (ejection fraction 0.49 vs. 0.58).

Conclusions:

• Pulmonary blood flow is a major determinant of ventricular cavity volume in single ventricle.
• Atrioventricular valve regurgitation impairs ventricular function and increases volume.
• These findings highlight the importance of managing pulmonary blood flow and valve function in single ventricle patients.