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Clinical contextWhy this tool matters and how to interpret it
Understand the result,
not just the number.
CASS Score (Coronary Artery Surgery Study): Comprehensive Explanation and Clinical Context The CASS Score was developed from the Coronary Artery Surgery Study to quantify the anatomical extent and severity of coronary artery disease (CAD) based on angiographic findings. Each major coronary vessel (Left Main, LAD, LCx, RCA) is scored according to the percentage of luminal narrowing and its prognostic weight. A higher score reflects a greater burden of atherosclerotic disease and correlates with adverse outcomes.
Normal Value: 0 indicates no significant coronary stenosis. Clinical Significance: - Mild CAD: CASS < 10 - Moderate CAD: CASS 10–19 - Severe CAD: CASS > 20 Higher scores are associated with increased risk of myocardial infarction and mortality, and they are often used to guide revascularization strategies (PCI vs CABG). Clinical Interpretation Summary: The CASS Score provides a semi-quantitative method to describe CAD severity in angiographic studies and clinical trials.
It is simpler than Gensini or SYNTAX but still retains prognostic value.
Evidence & references1 primary source mapped
- Source 1
- CASS Principal Investigators and Their Associates. "Coronary Artery Surgery Study (CASS): A Randomized Trial of Coronary Artery Bypass Surgery." Circulation. 1983;68(5):939–950. - Ringqvist I, Fisher LD, Mock M, et al. "Prognostic Value of Angiographic Indices of CAD in the Coronary Artery Surgery Study (CASS)." J Am Coll Cardiol. 1983;1(3):664–670.
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