Descending Aortic Distensibility and Cardiovascular Outcomes: A Cardiac Magnetic Resonance Imaging Study.

Area of Science:

• Cardiovascular imaging and diagnostics
• Vascular mechanics and hemodynamics
• Clinical outcomes research

Background:

• Aortic distensibility (AD) is crucial for cardiovascular health.
• Limited data exists on AD in the descending thoracic aorta and its link to cardiovascular outcomes.

Purpose of the Study:

• To investigate the association between AD measured in the descending thoracic aorta (ADdesc) and major adverse cardiovascular events.
• To determine if ADdesc is an independent predictor of cardiovascular morbidity and mortality.

Main Methods:

• A cohort of 928 patients referred for cardiovascular magnetic resonance (CMR) was analyzed.
• ADdesc was measured using steady-state free precession cine sequences and categorized into quintiles.
• Cox proportional-hazards regression was used to assess the primary outcome (all-cause mortality, MI, stroke, or revascularization).

Main Results:

• A decreased ADdesc was associated with traditional cardiovascular risk factors like hypertension and diabetes.
• Patients with lower ADdesc (≤ median or in the lowest quintile) had a higher incidence of the primary outcome.
• However, ADdesc was not an independent predictor of the primary endpoint after multivariable adjustment.

Conclusions:

• In a real-world CMR cohort, ADdesc is not an independent predictor of cardiovascular outcomes.
• Further research may be needed to clarify the role of descending thoracic aorta distensibility in cardiovascular risk stratification.