Carotid artery stenting: relationship between experience and complication rate

Area of Science:

• Interventional Cardiology
• Health Services Research

Background:

• Carotid artery stenting (CAS) is a critical procedure for stroke prevention.
• Understanding the impact of procedural volume and operator experience on CAS outcomes is essential for patient safety and quality improvement.

Purpose of the Study:

• To systematically review existing literature on the relationship between procedural volume and patient outcomes in carotid artery stenting.
• To identify evidence supporting a learning curve effect in CAS and establish potential volume thresholds for acceptable outcomes.

Main Methods:

• A systematic literature search was conducted across major databases (PubMed, Embase, Medline, Cochrane) for studies with year-on-year data on CAS.
• Included studies involved over 100 interventions; meta-regression was used for data pooling where feasible.
• Four case series and one registry met inclusion criteria; meta-analysis was not possible due to limited randomized data.

Main Results:

• Pooled analysis of case series demonstrated a significant trend of decreasing stroke/death rates over time.
• Meta-regression analysis identified thresholds for 'acceptable' stroke/death rates, suggesting a learning curve.
• Published CAS stroke and death rates show consistent improvement over time, independent of technological advancements.

Conclusions:

• Evidence suggests a significant learning curve in carotid artery stenting, with outcomes improving as experience accumulates.
• Achieving stroke/death rates below a 5% threshold may require approximately two years of active CAS procedures.
• These findings underscore the importance of procedural volume and experience in optimizing CAS patient safety and efficacy.