Related Experiment Videos
Dyslipidemias have a detrimental effect on left ventricular systolic function in patients with a first acute
1Department of Internal Medicine (Cardiology), National Taiwan University Hospital, Taipei, Republic of China.
Insights
Dyslipidemias, particularly high LDL cholesterol, worsen heart function after myocardial infarction (MI). This study shows elevated LDL cholesterol negatively impacts post-MI left ventricular ejection fraction (LVEF), independent of atherosclerosis severity.
Area of Science:
- Cardiology
- Lipid Metabolism
- Myocardial Infarction Research
Background:
- Lipid-lowering therapies reduce coronary events.
- The impact of dyslipidemias on myocardial infarction (MI) evolution remains unclear.
Purpose of the Study:
- To investigate if dyslipidemias aggravate myocardial vulnerability post-MI.
- To assess the relationship between lipid profiles and post-MI left ventricular ejection fraction (LVEF).
Main Methods:
- Studied 165 patients with first MI, measuring serum lipids, radionuclide ventriculography, and coronary angiography.
- Patients categorized into three groups based on 3-month cholesterol levels.
- Analyzed correlations between lipid levels and post-MI LVEF, Gensini score, and infarct-related artery patency.
Main Results:
- Higher 3-month cholesterol levels correlated with significantly lower post-MI LVEF (p < 0.0001).
- Low-density lipoprotein (LDL) cholesterol showed a strong negative correlation with post-MI LVEF (r = -0.55, p < 0.0001).
- Increased early LDL cholesterol and decreased early high-density lipoprotein (HDL) cholesterol were linked to higher peak creatine kinase (CK(MAX)) and reduced infarct-related artery patency, respectively.
Conclusions:
- Dyslipidemias, especially elevated LDL cholesterol, detrimentally affect post-MI LVEF.
- This negative impact may be independent of dyslipidemia's known atherogenic effects.
- Findings highlight the importance of managing lipid profiles in MI patients for improved cardiac recovery.
Abstract:
Several large-scale clinical trials have shown that lipid-lowering interventions are associated with reduced coronary events and mortality. However, whether dyslipidemias have a detrimental effect on the evolution of myocardial infarction (MI) is still unknown. To examine whether dyslipidemias can aggravate myocardial vulnerability following MI, 165 patients with a first MI were studied. All patients underwent measurements of serum lipid profiles 1 week and 3 months after MI, a radionuclide ventriculographic study, and a coronary angiographic study. The patients were divided into 3 groups according to their 3-month serum cholesterol levels (group 1, <200 mg/dl; group 2, 200 to 240 mg/dl; group 3, >240 mg/dl). Groups 1, 2, and 3 consisted of 66, 59, and 40 patients, respectively. Group 3 had a higher Gensini score than groups 1 and 2, although this was not statistically significant (p = 0.13). The postinfarct left ventricular ejection fraction (LVEF) was highest in group 1 (53 +/- 13%), at mid level in group 2 (43 +/- 14%), and lowest in group 3 (35 +/- 11%) (p < 0.0001). A significant negative correlation between 3-month low-density lipoprotein (LDL) cholesterol (r = -0.55, p < 0.0001) and the postinfarct LVEF was found. The product of peak creatine kinase (CK(MAX)) and time to CK(MAX) (p = 0.001), and patency of the infarct-related artery (p = 0.009), rather than variables of coronary atherosclerosis, were also independent predictors of the postinfarct LVEF. Increases in 1-week LDL cholesterol and decreases in 1-week high-density lipoprotein cholesterol were associated with a higher CK(MAX) and a lower patency rate of the infarct-related artery, respectively. This study revealed that dyslipidemias per se, especially LDL cholesterol, had a detrimental effect on the postinfarct LVEF; this effect might be independent of the atherogenic properties of dyslipidemias.