Progress in management of malperfusion syndrome from type B dissections

Area of Science:

• Cardiovascular Surgery
• Vascular Surgery
• Interventional Cardiology

Background:

• Malperfusion syndrome is a critical complication of acute type B aortic dissection.
• It significantly predicts adverse outcomes in affected patients.
• Prompt intervention is crucial for managing ischemia in these cases.

Purpose of the Study:

• To evaluate the efficacy and outcomes of endovascular revascularization for acute type B aortic dissection with malperfusion.
• To analyze survival and reintervention rates following intervention.
• To identify factors associated with poor outcomes.

Main Methods:

• Retrospective review of 61 patients with acute type B aortic dissection and malperfusion undergoing intervention (November 1999 - March 2011).
• Data collected on presentation, surgical details, and postoperative course.
• Statistical analysis included survival and freedom from reintervention using Cox proportional hazards models.

Main Results:

• Malperfusion affected spinal cord (12%), mesenteric (61%), renal (73%), and lower extremities (62%).
• 93% of patients experienced resolution of ischemia post-intervention.
• 5-year survival was 56%, with 5-year freedom from reintervention at 42%.
• Proximal stent graft coverage (to subclavian artery) was associated with increased mortality risk (HR 2.91, P=.034).

Conclusions:

• Endovascular intervention is a viable treatment for malperfusion in acute type B aortic dissection.
• While overall outcomes are acceptable, extensive aortic coverage may signal more severe disease and worse prognosis.
• Careful consideration of stent graft placement is warranted to optimize patient outcomes.