Gender-specific differences in aortic sinus curvature during aging: an anatomical and computational study

Area of Science:

• Cardiovascular Research
• Biomechanical Engineering
• Medical Imaging and Histology

Background:

• Type A aortic dissection (TAAD) is a life-threatening condition.
• The role of aortic sinus geometry in TAAD risk is not fully understood.
• Investigating aortic sinus wall curvature may reveal new insights into TAAD pathogenesis.

Purpose of the Study:

• To investigate the impact of aortic sinus wall curvature on the risk of type A aortic dissection.
• To analyze gender-specific changes in aortic root geometry with aging.
• To evaluate the biomechanical implications of sinus curvature on aortic dissection risk.

Main Methods:

• Measurement of aortic noncoronary sinus curvature in 46 patients.
• Histological examination of aortic tissue.
• Finite element analysis to simulate mechanical stress in the aortic root.

Main Results:

• Aortic sinus curvature increased over fourfold with age in males, reaching female levels by age 65.
• Histology showed minimal age-related degenerative changes, but increased fibrosis in older women.
• Finite element analysis indicated that higher sinus curvature correlated with a lower risk of circumferential tears.

Conclusions:

• Significant gender-specific differences in aortic root aging were observed.
• Higher aortic sinus wall curvature appears to have a protective effect against type A aortic dissection.
• Aortic geometry alone cannot explain the observed gender disparity in TAAD prevalence.