Which Fredrickson type carries the highest cardiac risk?

• A. Type IIa (Highest)
• B. Type IIb
• C. Type III
• D. Type IV

Answer: (A)

LDL drives atherosclerosis, so the lipoprotein profile that leads to the most aggressive buildup of plaque is the one with marked LDL elevation. Type IIa is defined by an isolated, very high LDL cholesterol level, which means a large number of atherogenic particles circulating and infiltrating arterial walls. This direct emphasis on LDL makes this phenotype carry the strongest risk for premature coronary disease compared with other Fredrickson types, where either VLDL (triglycerides) or remnant particles are the dominant issue. While other types can also have cardiovascular risk, the pure, substantial LDL elevation seen in this profile is the most potent driver of early plaque formation.