The Clinical Value of Modified Low Density Lipoprotein-Cholesterol in Patients Who Underwent Percutaneous Coronary Intervention

ABSTRACT

BACKGROUND AND OBJECTIVES: It is well known that atherosclerosis is characterized by chronic inflammation of an injured intima and the pathological processes are initiated by an accumulation of morphologically distinct, modified forms of low density lipoprotein (LDL)-cholesterol. However, it is not well known whether the level of modified LDL-cholesterol has clinical significance for the patients who underwent percutaneous coronary intervention (PCI). SUBJECTS AND METHODS: Eighty seven patients (mean age 63.0 +/- 11.1 years, 58 men) who underwent PCI were enrolled. The patients with stable or unstable angina pectoris were classified as group I (n=44, mean age 62.4 +/- 9.3 years), and the patients with acute myocardial infarction were classified as group II (n=43, mean age 63.6 +/- 12.7 years). Modified LDL-cholesterol was expressed semiquantitatively by agarose gel electrophoresis with using the charge modification frequency (CMF). The clinical and coronary angiographic data was analyzed. RESULTS: The clinical diagnosis was stable angina in 13 patients, unstable angina in 31 patients, non-ST elevation myocardial infarction in 5 patients and ST elevation myocardial infarction in 38 patients. There were no significant differences of the CMF between two groups (3.0 +/- 7.9 vs. 2.1 +/- 10.9, respectively, p=0.671). The diameter stenosis was severe in the patients with a CMF greater than 10 (84.0 +/- 10.4% vs. 78.6 +/- 13.7%, respectively, p=0.047). The six-month major adverse cardio-vascular events (MACEs) had no relationship with the CMF in group I. However, in group II, the 6-month MACEs developed more frequently in the patients with a CMF higher than 10 {2 (28%) for group ll vs. 2 (5%) for group 1, p=0.031}. The patients with acute myocardial infarction and whose CMF was higher than 10 had in-stent restenosis observed on their follow-up coronary angiography (p=0.003). CONCLUSION: A higher level of modified LDL-cholesterol is associated with severe angiographic findings and a poor prognosis for patients with acute myocardial infarction.