Design Matters: How Methodological Decisions May Have Shaped the Findings of CREST-2

Area of Science:

• Vascular Surgery
• Neurology
• Clinical Trials

Background:

• Asymptomatic carotid stenosis poses a risk of stroke.
• Medical management is a standard treatment, but revascularization (stenting or endarterectomy) is also considered.
• The CREST-2 trial compared these approaches.

Purpose of the Study:

• To compare medical management alone versus medical management plus revascularization for asymptomatic carotid stenosis.
• To evaluate the efficacy and safety of carotid artery stenting and carotid endarterectomy in preventing stroke events.

Main Methods:

• Two parallel randomized trials within the CREST-2 study.
• Comparison of medical management alone against medical management plus carotid artery stenting or carotid endarterectomy.
• Follow-up duration of 4 years for primary events.

Main Results:

• Carotid stenting demonstrated a statistically significant, albeit modest, reduction in primary events over 4 years.
• Carotid endarterectomy did not show a significant reduction in primary events compared to medical management alone.
• Methodological aspects of the trial may have influenced the revascularization arms' outcomes.

Conclusions:

• The study suggests potential methodological biases that might have favored revascularization arms.
• Advances in medical therapy and potential methodological considerations indicate that outcomes may be similar across stenting, endarterectomy, and medical management in current clinical practice.