Proximal aortic aneurysms: correlation of maximum aortic diameter and aortic wall thickness

Area of Science:

• Cardiovascular Surgery
• Medical Imaging
• Aortic Disease Research

Background:

• Proximal aortic aneurysms require intervention to prevent catastrophic events like dissection or rupture.
• Current risk stratification relies on maximum aortic diameter and factors such as bicuspid aortic valve, family history, or rapid growth.
• Laplace's law suggests wall tension depends on pressure, radius, and wall thickness, but precise wall thickness measurement is limited by imaging.

Purpose of the Study:

• To investigate the correlation between maximum aortic diameter and aortic wall thickness.
• To assess the relationship between aortic diameter, wall thickness, and established indices for adverse aortic events.

Main Methods:

• Aortic tissue samples were collected from 292 patients undergoing cardiac surgery.
• Histological analysis was performed to determine aortic wall thickness (intima and media).
• Correlations were analyzed between aortic dimensions, wall thickness, patient demographics, and risk indices.

Main Results:

• Maximum ascending aortic diameter showed no significant correlation with medial (R=0.07) or intimal (R=0.28) thickness.
• Ascending aortic diameter did not correlate with age (R=-0.18) or body surface area (R=0.07).
• Neither intimal nor medial thickness correlated with the Svensson index or aortic size index.

Conclusions:

• Conventional metrics like aortic diameter and risk indices do not correlate with aortic wall thickness.
• Current methods may be insufficient for accurately identifying patients at high risk for aortic complications.
• Novel indices are necessary for improved risk stratification in proximal aortic aneurysm management.