Aortic root dilatation and aortic stiffness in patients with single ventricular circulation

Area of Science:

• Cardiovascular Physiology
• Pediatric Cardiology
• Congenital Heart Disease

Background:

• Single ventricle (SiV) circulation presents unique challenges, including potential aortic dilatation.
• The relationship between aortic stiffness and aortic dilatation in SiV patients requires further investigation.

Purpose of the Study:

• To test if aortic stiffness is elevated in SiV patients with aortic dilatation compared to those without.
• To determine if aortic stiffness is an independent predictor of aortic dilatation in SiV patients.

Main Methods:

• 56 SiV patients underwent catheterization for measurement of pulse wave velocity (PWV) and aortic size.
• Patients were categorized into groups with and without aortic dilatation (aortic root diameter >1.5 observed/expected).
• Statistical analyses included ANCOVA and multivariate analysis, controlling for age, aortic pressure, and aortic flow.

Main Results:

• Patients with aortic dilatation exhibited significantly higher PWV than those without (483.6±10.3 vs. 394.0±8.9 cm/s, P<0.001).
• A strong positive correlation was observed between aortic root diameter and PWV (P<0.001).
• Multivariate analysis confirmed PWV as an independent determinant of aortic dilatation (P<0.001).

Conclusions:

• Increased aortic stiffness is a significant factor in SiV patients with aortic dilatation.
• Aortic stiffness independently contributes to the development of aortic dilatation in this population.
• Further research is needed to explore aortic stiffness modulation for improving Fontan circulation prognosis and preventing aortic regurgitation.