system
Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, RESULTS. Meshes: 1-Alkyl-2-acetylglycerophosphocholine Esterase, Adult, Biomarkers, Coronary Artery Disease, Coronary Circulation, Coronary Vessels, Endothelium, Vascular, Female, Humans, Hypolipidemic Agents, Male, Microcirculation, Middle Aged, Phospholipases A, Phospholipases A2, Predictive Value of Tests, Risk Factors.
user
Is lipoprotein-associated phospholipase A2 an independent marker for coronary endothelial dysfunction in humans? Context: The purpose of the current study was to determine whether lipoprotein-associated phospholipase A2 (Lp-PLA2) is associated with coronary endothelial dysfunction and is a predictor of endothelial dysfunction in humans. Patients (172) with no significant coronary artery disease (<30% stenosis) undergoing assessment of coronary endothelial function were studied. Endothelial function was assessed by the change in coronary blood flow and coronary artery diameter in response to intracoronary acetylcholine. Plasma concentrations of Lp-PLA2 were measured, and patients were divided into tertiles. Patients in tertiles 2 and 3 had a significantly lower change in coronary blood flow (63.8+/-73.2 and 32.0+/-71.7 versus 78.4+/-73.2%; P<0.001) and greater epicardial coronary artery vasoconstriction (-14.1+/-14.7 and -23.3+/-25.1 versus -9.5+/-15.2% mean diameter change; P<0.001) in response to acetylcholine. Patients with coronary endothelial dysfunction had significantly higher serum concentrations of Lp-PLA2 than those with normal endothelial function (246.2+/-71.6 versus 209+/-56.7 ng/mL; P=0.001). The odds ratio for coronary endothelial dysfunction in patients with Lp-PLA2 in the highest tertile was 3.3 (95% CI, 1.6 to 6.6).
assistant
Lp-PLA2 is independently associated with coronary artery endothelial dysfunction and is a strong predictor of endothelial dysfunction in humans. Final Decision: yes