Abstract Background Low-density lipoprotein cholesterol (LDL-C) has been determined as one of the causal factors of Atherosclerotic Cardiovascular Disease (ASCVD). The term "cholesterol-years" represents the cumulative exposure of the arterial wall to LDL-C during the lifetime, and is measured by multiplication of patient’s age, and LDL-C level. According to the theory, exceeding a certain number of "cholesterol-years" increases the risk of myocardial infarction (MI) [1]. So far, there are no studies that assess the effect of "cholesterol-years" on the risk of the first MI. Purpose We aimed to determine whether "cholesterol-years", as an indicator of cumulative exposure to LDL-C, is associated with the risk of development of the first MI in Polish patients. Method Data were extracted from patients from years 2016-2022, who were participants of the Polish Registry of Acute Coronary Syndromes (PL-ACS), a national, multicenter, ongoing, prospective observational registry that includes all patients hospitalized with the acute coronary syndrome (ACS) in Poland. The study group consisted of patients who had not previously been treated with lipid-lowering therapy, with first MI, and had the available data for LDL-C. The association between the "cholesterol-years" and the occurrence of the first MI was assessed using the Spearman’s correlation. All continuous variables were presented as mean (SD), and categorical variables were shown as absolute numbers and percentages. Results The studied group constituted 35,747 patients, with the mean age of 66.5 years, of whom 36% were women. 25,6% of patients had diabetes, 70,8% arterial hypertension, and 62.6% were past-or-present smokers. In patients with the first myocardial infarction, there is a significant linear correlation between cholesterol-years and the age at which the first myocardial infarction occurs. In our observation, exceeding 6,000 "cholesterol-years" at the age of 40 increases the risk of the first myocardial infarction. Conclusion In the large, real-world population, the risk of the first myocardial infarction was linearly correlated with the number of "cholesterol-years", which supports the "cholesterol-years" theory of the risk of development of the first MI.Baseline Characteristics of PatientsCholesterol-years in the study group
Read full abstract