An elevated lipoprotein(a) plasma level as a cardiovascular risk factor

Area of Science:

• Cardiology
• Lipidology
• Preventive Medicine

Background:

• The link between elevated lipoprotein(a) (Lp(a)) and cardiovascular risk is debated, with no current guidelines for managing hyperLp(a)emia.
• This study investigates Lp(a) thresholds and the impact of combined cardiovascular risk factors.

Purpose of the Study:

• To determine Lp(a) plasma level thresholds associated with cardiovascular events.
• To evaluate the combined effect of elevated Lp(a) with other cardiovascular risk factors.

Main Methods:

• Retrospective analysis of 544 outpatients from a Lipid Disorders Department.
• Data categorized into quintiles based on Lp(a) levels, analyzing age, BMI, dyslipidemias, hypertension, diabetes, smoking, and vascular events.
• Utilized 15 small quantiles for precise Lp(a) threshold identification.

Main Results:

• Cardiovascular event odds ratios increased with Lp(a) levels, from 2.65 (483-821 mg/L) to 6.36 (≥1495 mg/L).
• Relative risk was 0.08 for Lp(a) < 232 mg/L and 3.6 for Lp(a) ≥ 315 mg/L.
• The combination of elevated Lp(a) and arterial hypertension was a more significant risk factor than gender, age, or hypertension with smoking.

Conclusions:

• A Lp(a) plasma level exceeding approximately 300 mg/L appears to be a threshold for cardiovascular events.
• Elevated Lp(a) combined with arterial hypertension represents the most critical cardiovascular risk factor.
• Lp(a) levels below 232 mg/L are associated with a favorable prognosis.