Lower Baseline LDL Cholesterol Affects All-cause Mortality in Patients with First Percutaneous Coronary Intervention

Area of Science:

• Cardiovascular Medicine
• Clinical Research
• Epidemiology

Background:

• The
• cholesterol paradox
• describes a phenomenon where patients with coronary artery disease (CAD) and high baseline low-density lipoprotein cholesterol (LDL-C) exhibit better prognoses.
• Previous foreign studies suggested this paradox, but its applicability to diverse populations remained unclear.

Purpose of the Study:

• To investigate the existence of the
• cholesterol paradox
• in a Chinese population of patients with coronary artery disease (CAD).
• To determine if high baseline low-density lipoprotein cholesterol (LDL-C) is associated with improved clinical outcomes in this specific demographic.

Main Methods:

• A retrospective cohort study involving 2,056 patients who underwent their first percutaneous coronary intervention (PCI) between 2014 and 2016.
• Patients were stratified into two groups based on baseline LDL-C levels (≤2.6 mmol/L vs. >2.6 mmol/L).
• Outcomes assessed included major adverse cardiovascular events (MACE), all-cause mortality, recurrent myocardial infarction, unexpected revascularization, and nonfatal stroke.

Main Results:

• All-cause mortality was significantly higher in the high-LDL-C group (2.4%) compared to the low-LDL-C group (0.7%) (adjusted HR: 4.030, P = 0.037).
• No significant differences were observed between the groups regarding the risk of MACE or secondary endpoints like unexpected revascularization or nonfatal stroke.

Conclusions:

• The study suggests that a high baseline LDL-C is not associated with a reduced risk of adverse clinical outcomes in Chinese CAD patients undergoing their first PCI.
• These findings indicate that the
• cholesterol paradox
• may not be applicable to the Chinese population.