Calibration of the Pooled Cohort Equations for Atherosclerotic Cardiovascular Disease: An Update

Area of Science:

• Cardiology
• Public Health
• Epidemiology

Background:

• The 2013 American College of Cardiology/American Heart Association guidelines updated cholesterol management recommendations.
• These guidelines introduced new Pooled Cohort Equations (PCEs) to estimate atherosclerotic cardiovascular disease (ASCVD) risk, including coronary heart disease and stroke.
• The previous Third Report of the National Cholesterol Education Program (NCEP) Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults (Adult Treatment Panel III) served as a prior standard.

Purpose of the Study:

• To review and analyze external validation studies of the 2013 PCEs.
• To identify discrepancies between predicted and observed ASCVD risks.
• To discuss potential reasons for these discrepancies and inform future recalibration efforts.

Main Methods:

• A narrative review of published reports evaluating the PCEs.
• Analysis of 15 external validation studies from the US and Europe.
• Assessment of study methodologies, cohort characteristics, and reported outcomes.

Main Results:

• The PCEs overestimated observed ASCVD risk in almost all external validation cohorts.
• Validation cohorts often used more contemporary populations than the guideline development cohorts.
• Significant discrepancies were noted between predicted and actual cardiovascular event rates.

Conclusions:

• The PCEs require recalibration to improve accuracy in current clinical practice.
• Understanding the limitations of validation studies is crucial for interpreting PCE performance.
• Accurate risk prediction is essential for effective cardiovascular disease prevention strategies.