Lp(a) levels in patients undergoing aorto-coronary bypass surgery

Area of Science:

• Cardiovascular Medicine
• Clinical Biochemistry
• Atherosclerosis Research

Background:

• Severe coronary atherosclerosis often necessitates aorto-coronary bypass surgery.
• Understanding lipid and apoprotein profiles is crucial for managing cardiovascular disease risk.

Purpose of the Study:

• To assess plasma lipid, apoprotein, and Lipoprotein(a) [Lp(a)] levels in patients undergoing bypass surgery.
• To correlate these biochemical markers with the extent of coronary vessel involvement.

Main Methods:

• Comparison of 77 bypass patients with 77 matched controls.
• Analysis of plasma triglyceride, HDL-cholesterol, apolipoprotein A-I (apo A-I), apolipoprotein B (apo B), and Lp(a) levels.
• Stratification of patients based on the number of diseased coronary vessels.

Main Results:

• Bypass patients showed higher triglyceride and apo B, with lower HDL-cholesterol and apo A-I compared to controls.
• A significantly higher prevalence of low HDL-cholesterol (<35 mg/dL) and high Lp(a) (>70 mg/dL) was observed in bypass patients.
• While not statistically significant, a trend towards increased Lp(a) levels and prevalence was noted with greater coronary vessel disease severity.

Conclusions:

• Patients with severe coronary artery disease requiring bypass surgery typically present with dyslipidemia, characterized by low HDL-cholesterol and high triglycerides.
• Lp(a) levels exceeding 70 mg/dL are strongly associated with severe coronary vessel stenosis.