False Lumen Flow Assessment by Magnetic Resonance Imaging and Long-Term Outcomes in Uncomplicated Aortic Dissection

Area of Science:

• Cardiovascular Imaging
• Vascular Surgery
• Radiology

Background:

• Acute aortic dissection (AD) with a persistent patent false lumen (FL) carries a significant risk of future clinical events, even without initial complications.
• Established morphological parameters may not fully capture the long-term risk associated with AD.

Purpose of the Study:

• To evaluate the natural progression of uncomplicated AD.
• To determine if FL flow patterns identified by MRI offer independent prognostic value for AD-related events, beyond traditional morphologic factors.

Main Methods:

• Prospective follow-up of 131 patients (78 Type A surgical, 53 Type B medical) with acute AD and persistent patent FL.
• Assessment of aortic diameter, true lumen compression, entry tear, and FL thrombosis via CT.
• Analysis of FL systolic and diastolic flow patterns using MRI within the first year post-AD.

Main Results:

• Over a median 8.0-year follow-up, 43 patients experienced aorta-related events (25 deaths, 18 endovascular treatments).
• Predictors of aortic events included FL systolic antegrade flow ≥30% and diastolic retrograde flow ≥80%.
• Multivariate analysis identified aortic diameter >45 mm, Type B dissection, and specific MRI flow patterns as independent predictors of AD-related events.

Conclusions:

• High systolic antegrade FL flow and significant diastolic retrograde flow on MRI, along with aortic diameter >45 mm, identify patients at elevated risk for AD complications.
• These findings suggest that patients with these high-risk indicators may benefit from more aggressive management strategies.