The BG Study Part 1 (Bergisch Gladbach): Development of a Prototype Coronary Artery Disease Risk Score Incorporating Peripheral Vascular Parameters—Preliminary Insights for Future CAD Risk Prediction Models in Vascular Patients

<b>Background:</b> Peripheral vascular parameters may provide valuable insights into coronary artery disease (CAD) risk stratification. This study aimed to develop a CAD risk score by integrating carotid duplex velocities, ankle-brachial index (ABI), and clinical history into a point-based model. <b>Methods:</b> We analyzed data from 902 cardiology patients, of whom 592 (65.6%) had confirmed CAD based on coronary angiography. Peripheral vascular assessments included carotid duplex ultrasonography and ABI measurements. Predictors were identified through multivariate logistic regression, addressing multicollinearity and interaction effects. A point-based scoring system was developed using statistically significant variables and evaluated via receiver operating characteristic (ROC) analysis. <b>Results:</b> Key predictors included external carotid artery velocities, ABI, carotid stenosis, chronic kidney disease (CKD) stage, smoking history, diabetes, hypertension, and age. The scoring system demonstrated moderate discriminative ability (AUC: 0.683) and high sensitivity (97%) for detecting CAD-positive cases but lower specificity (11%) for CAD-negative cases. Patients were stratified into risk categories, with an optimal threshold of ≥7 points maximizing the F1 score. <b>Conclusions:</b> This novel scoring system highlights the clinical relevance of integrating peripheral vascular assessments into CAD risk models. While its high sensitivity ensures robust detection of CAD-positive patients, future multicenter studies are needed to improve specificity and validate its broader clinical utility.