Carotid Intima-Media Thickness Progression as Surrogate Marker for Cardiovascular Risk: Meta-Analysis of 119 Clinical...

Area of Science:

• Cardiovascular Medicine
• Clinical Trials
• Biomarkers

Background:

• Cardiovascular disease (CVD) remains a leading cause of mortality worldwide.
• Carotid intima-media thickness (cIMT) is a subclinical marker of atherosclerosis.
• Quantifying the relationship between cIMT progression and CVD risk is crucial for clinical trial design.

Purpose of the Study:

• To determine the association between interventions affecting cIMT progression and their impact on CVD risk.
• To evaluate the predictive value of cIMT progression for CVD outcomes.

Main Methods:

• Systematic review and meta-regression of 119 randomized controlled trials (100,667 patients).
• Primary outcome: combined CVD events (myocardial infarction, stroke, revascularization, fatal CVD).
• Bayesian meta-regression used to link intervention effects on cIMT progression and CVD risk.

Main Results:

• A 10 microm/y reduction in cIMT progression was associated with a 9% relative risk reduction in CVD.
• Interventions reducing cIMT progression by 10-40 microm/y yielded CVD risk reductions from 16% to 37%.
• Results remained consistent across various subgroup analyses (intervention type, patient data availability, etc.).

Conclusions:

• The degree of intervention effect on cIMT progression directly predicts CVD risk reduction.
• cIMT progression serves as a valuable surrogate marker for CVD risk in clinical trials.
• This study provides a quantitative link supporting cIMT's utility in evaluating cardiovascular interventions.