Question
A 60-year-old asymptomatic male with a 10-year ASCVD risk of 12% has a Coronary Artery Calcium (CAC) score of 450 Agatston units. His LDL-C is 115 mg/dL. According to the "Multi-Ethnic Study of Atherosclerosis" (MESA) data often used by lipidologists, what does a CAC >300 signify regarding his risk category, and what is the LDL-C goal?
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Risk Classification:
A CAC score >300 (or >75th percentile for age/sex) reclassifies the patient into a
"High-Risk"
category, regardless of the pooled cohort equation result. A CAC score of 450 is associated with a 10-year event rate that exceeds the threshold for high-risk categorization (typically >20%).
LDL-C Goal:
Based on NLA recommendations and the 2018 ACC/AHA Multi-society guidelines:
For High-Risk primary prevention, the goal is a ≥ 50%
reduction
in LDL-C from baseline.
Many lipidologists target an absolute LDL-C < 70 mg/dL in the presence of a very high CAC score (>400), as these patients have a risk profile similar to those with established clinical ASCVD.
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