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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
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Atherosclerosis is a progressive disorder characterized by the buildup of plaques on the arterial inner wall, causing them to narrow and harden over time. These plaques comprise lipids, calcium, blood components, carbohydrates, and fibrous tissue. The process primarily affects the intima of large and medium-sized arteries, reducing blood flow in any artery.Etiology and risk factorsThe cause of atherosclerosis is multifactorial, involving a complex interplay among endothelial injury, lipid...
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Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ...
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Blood Studies for Cardiovascular System III: Serum Lipid Profile01:25

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Management of atherosclerosis involves an integrated strategy encompassing pharmacological treatment, surgical interventions, lifestyle changes, and nutrition therapy to address the multifactorial nature of the disease.Pharmacological TherapyA cornerstone of atherosclerosis management is the use of pharmacological agents. Statins, such as atorvastatin, are pivotal in inhibiting HMG-CoA reductase, an enzyme that catalyzes an initial step in cholesterol synthesis in the liver. This reduction in...
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Effective preventive measures for coronary artery disease (CAD) focus on controlling modifiable risk factors, including cholesterol abnormalities and lifestyle changes.Cholesterol ManagementFirst, the Mediterranean diet and the American Heart Association advocate for maintaining low-density lipoprotein (LDL) cholesterol levels below 100 mg/dL, with a more stringent recommendation of below 70 mg/dL for individuals at high risk. LDL cholesterol, often termed "bad cholesterol," can lead to the...
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[LDL-Cholesterol--Is there an "LDL hypothesis"?].

Florian Custodis1, Ulrich Laufs1

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The LDL-Hypothesis, linking LDL cholesterol to heart disease, is outdated. Evidence strongly supports LDL-causality, not just a hypothesis, for atherosclerosis development and cardiovascular risk.

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Area of Science:

  • Cardiology
  • Biochemistry
  • Genetics

Context:

  • The association between LDL cholesterol and cardiovascular outcomes is often termed the "LDL-Hypothesis."
  • Recent randomized trials prompt re-evaluation of this terminology.

Purpose:

  • To assess the adequacy of the term "LDL-Hypothesis" in light of current scientific evidence.
  • To propose a more accurate term reflecting the established role of LDL cholesterol.

Summary:

  • Extensive evidence, including genetic associations, epidemiological data, and results from major statin trials and the IMPROVE-IT study, supports a causal role for LDL cholesterol in atherosclerosis.
  • The term "hypothesis" is deemed insufficient to describe the established link between LDL cholesterol and cardiovascular events.

Impact:

  • Recommends replacing "LDL-Hypothesis" with "LDL-causality" to accurately reflect scientific consensus.
  • This shift in terminology emphasizes the definitive causal role of LDL cholesterol in cardiovascular disease pathogenesis.