September 22, 2023

Your Cholestrol

Cholesterol in food

Cholesterol in food only has a small effect on the level of cholesterol in your blood.Cholesterol is a fat found in your blood. It’s produced naturally in your body, and you can also get cholesterol from some foods.
High total blood cholesterol is a risk factor for heart disease. Find out more about blood cholesterol.

Worried about your cholesterol levels?

When it comes to your blood cholesterol levels, cholesterol in food is less important than eating less saturated and trans fats, and more healthy fats.
Cholesterol in food has only a small effect on the bad (LDL) cholesterol in your blood. Saturated and trans fats in food cause a much greater increase in LDL cholesterol. Eating healthy fats helps the cholesterol balance by decreasing LDL and increasing the good (HDL) cholesterol.
You can include some cholesterol-rich foods as part of a healthy balanced diet low in saturated fat. Cholesterol-rich foods include offal (e.g. liver, pâté and kidney) and prawns.

What about eggs?

Most people don’t need to worry about eggs and cholesterol. Eggs are very nutritious. They contain good quality protein, lots of vitamins and minerals, and healthier polyunsaturated fat. The dietary cholesterol in eggs has only a small effect on blood LDL cholesterol, so you can enjoy up to six eggs each week as part of a healthy balanced diet.

Blood cholesterol

Cholesterol is a fatty substance that is carried around the body in the blood. The body produces most cholesterol naturally, and it is found in some foods. Lipoproteins carry cholesterol in the blood. The two main types that carry cholesterol to and from cells are called low density lipoproteins (LDL-C) and high density lipoproteins (HDL-C).

The lower the density of the lipoproteins the more fats it contains. High density lipoprotein (HDL cholesterol) is called the ‘good cholesterol’ because it helps to keep cholesterol from building up in the arteries. Low density lipoprotein (LDL cholesterol) is called the ‘bad cholesterol’ because it is the main source of cholesterol build-up and blockage in the arteries. Statin medication work to reduce this LDL-C.

Total cholesterol is a reading of the good and bad cholesterol. Triglycerides are another form of fat in the blood that can also raise the risk of heart disease. High triglycerides are often associated with low HDL cholesterol increasing risk, even though total cholesterol levels in the blood appear normal. When there is too much LDL-cholesterol in the blood, it builds up in the walls of the arteries (plaque). Over time, this build up causes ‘hardening of the arteries’. This can cause chest pain and/ or a heart attack.

2018 ACC/AHA Multisociety Guideline on the Management of Blood Cholesterol

  1. In all individuals, emphasize a heart-healthy lifestyle across the life course. A healthy lifestyle reduces ASCVD risk at all ages. In younger individuals, healthy lifestyle can reduce development of risk factors and is the foundation of ASCVD risk reduction. In young adults 20 to 39 years of age, an assessment of lifetime risk facilitates the clinician–patient risk discussion and emphasizes intensive lifestyle efforts. In all age groups, lifestyle therapy is the primary intervention for metabolic syndrome.

    Expert Perspective: As with generalized obesity, the lifestyle changes to eliminate one or more of the metabolic syndrome components often need a multidisciplinary effort over long periods of time to prevent recidivism.

  2. In patients with clinical ASCVD, reduce low-density lipoprotein cholesterol (LDL-C) with high-intensity statins or maximally tolerated statins to decrease ASCVD risk. Greater LDL-C reductions on statin therapy, leading to lower LDL-C levels, lower significant risk. Use a maximally tolerated statin to reduce LDL-C levels by ≥50%.

    Expert Perspective: The guideline definition of clinical ASCVD includes stroke, transient ischemic attack (TIA), documented coronary artery disease (CAD) with stable angina, acute coronary syndromes (ACS), coronary or other arterial revascularization, peripheral vascular disease with or without claudication, and aortic aneurysm. While risk estimates for deciding preventive therapies should not include stress testing or cardiac ultrasound, in men and women with a ≥5% 10-year risk for CV events, I would include ASCVD in asymptomatic CAD with ischemia defined by stress electrocardiography (ECG) or stress imaging. In those who are low risk with evidence of ischemia, the addition of a coronary artery calcium (CAC) score would help clarify risk.

  3. In very high-risk ASCVD, use an LDL-C threshold of 70 mg/dl (1.8 mmol/L) to consider addition of nonstatins to statins. In very high-risk ASCVD patients, it is reasonable to add ezetimibe to maximally tolerated statin therapy when the LDL-C level remains ≥70 mg/dl (≥1.8 mmol/L). In patients at very high risk whose LDL-C level remains ≥70 mg/dl on maximally tolerated statin and ezetimibe therapy, adding a PCSK9 inhibitor is reasonable, although the long-term safety (>3 years) is uncertain and cost-effectiveness is low at mid-2018 prices.

    Expert Perspective: Very high risk for future ASCVD events includes a history of multiple major ASCVD events (ACS within 12 months, myocardial infarction, ischemic stroke, peripheral arterial disease defined as claudication with ankle-brachial index [ABI] <0.85, or previous revascularization or amputation, or one major event with multiple high-risk conditions). High-risk conditions are defined as age ≥65 years, heterozygous familial hypercholesterolemia (HeFH), prior coronary revascularization outside of the major ASCVD events, diabetes, hypertension, chronic kidney disease with estimated glomerular filtration rate 15-59 ml/min/1.72 cm2, current smoker, and LDL-C ≥100 mg/dl despite maximally tolerated statin therapy and ezetimibe. These recommendations extend the use of PCSK9 inhibitors to those patients included in the outcome trials who demonstrated LDL-C ‘lower is better’ and safe to very low levels.

  4. In patients with severe primary hypercholesterolemia (LDL-C level ≥190 mg/dl [≥4.9 mmol/L]) without calculating 10-year ASCVD risk, begin high-intensity statin therapy. If the LDL-C level remains ≥100 mg/dl, adding ezetimibe is reasonable. If the LDL-C level on statin plus ezetimibe remains ≥100 mg/dl and the patient has multiple factors that increase subsequent risk of ASCVD events, a PCSK9 inhibitor may be considered, although the long-term safety (>3 years) is uncertain and economic value is uncertain at mid-2018 prices.

    Expert Perspective: Patients with HeFH are approved by the Food and Drug Administration (FDA) and most insurance carriers for PCSK9 inhibitor therapy regardless of presence of ASCVD because of very high risk. Those with HeFH and an LDL-C of 190 mg/dl have a 3-4-fold greater risk of CV events than others at the same LDL-C level and 20-fold greater risk than those with an LDL-C of 130 mg/dl. HeFH is more common than previously thought and needs to be considered in all persons with premature coronary disease and those with elevated LDL-C and family members with premature CAD or high LDL-C.

  5. In patients 40 to 75 years of age with diabetes mellitus and an LDL-C level of ≥70 mg/dl, start moderate-intensity statins without calculating 10-year ASCVD risk. In patients with diabetes mellitus at higher risk, especially those with multiple risk factors or those 50 to 75 years of age, it is reasonable to use a high-intensity statin to reduce the LDL-C level by ≥50%.
  6. In adults 40 to 75 years of age evaluated for primary ASCVD prevention, have a clinician–patient risk discussion before starting statin therapy. Risk discussion should include a review of major risk factors (e.g., cigarette smoking, elevated blood pressure, LDL-C, hemoglobin A1c [if indicated], and calculated 10-year risk of ASCVD); the presence of risk-enhancing factors (see #8); the potential benefits of lifestyle and statin therapies; the potential for adverse effects and drug–drug interactions; consideration of costs of statin therapy; and patient preferences and values in shared decision-making.

    Expert Perspective: Primary care physician time constraints often necessitate use of trained nonphysician providers for risk assessment and discussions and referral to lipid or other prevention specialists, particularly for patients with a family history of premature coronary disease and major risk factors.

  7. In adults 40 to 75 years of age without diabetes mellitus and with LDL-C levels ≥70 mg/dl (≥1.8 mmol/L), at a 10-year ASCVD risk of ≥7.5%, start a moderate-intensity statin if a discussion of treatment options favors statin therapy. Risk-enhancing factors favor statin therapy (see #8). If risk status is uncertain, consider using CAC to improve specificity (see #9). If statins are indicated, reduce LDL-C levels by ≥30%, and if 10-year risk is ≥20%, reduce LDL-C levels by ≥50%.

    Expert Perspective: If the patient is considered intermediate risk but there are ≥1 risk-enhancing factors or a high CAC score as in #8 and #9, you can discuss higher intensity statin as an option.

  8. In adults 40 to 75 years of age without diabetes mellitus and 10-year risk of 5%-19.9%, risk-enhancing factors favor initiation of statin therapy. Risk-enhancing factors include family history of premature ASCVD; persistently elevated LDL-C levels ≥160 mg/dl (≥4.1 mmol/L); metabolic syndrome; chronic kidney disease; history of preeclampsia or premature menopause (age <40 years); chronic inflammatory disorders (e.g., rheumatoid arthritis, psoriasis, or chronic HIV); high-risk ethnic groups (e.g., South Asian); persistent elevations of triglycerides ≥175 mg/dl (≥1.97 mmol/L); and, if measured in selected individuals, apolipoprotein B ≥130 mg/dl or ≥2500 nmol/L, high-sensitivity C-reactive protein ≥2.0 mg/L (190 nmol/L), ABI <0.9, and lipoprotein (a) ≥50 mg/dl or 125 nmol/L, especially at higher values of lipoprotein (a).

    Expert Perspective: Other risk-enhancing factors include systemic lupus, and radiation therapy for left breast cancer and other radiation therapies where the left main, left anterior descending, and proximal right coronary artery is in the field.

  9. In adults 40 to 75 years of age without diabetes mellitus and with LDL-C levels ≥70 mg/dl-89 mg/dl (≥1.8-4.9 mmol/L), at a 10-year ASCVD risk of ≥7.5%-19.9%, if a decision about statin therapy is uncertain, consider measuring CAC. If the CAC score is zero, treatment with statin therapy may be withheld or delayed, except in cigarette smokers, those with diabetes mellitus, and those with a strong family history of premature ASCVD. A CAC score of 1-99 favors statin therapy, especially in those >55 years of age. For any patient, if the CAC score is ≥100 Agatston units or ≥75th percentile, statin therapy is indicated unless otherwise deferred by the outcome of clinician–patient risk discussion.

    Expert Perspective: Unfortunately, screening using the CAC is patient pay with cost of $75-$350. Considering that it can be performed at less than the cost of an ECG, and that the results are highly impactful, it makes no sense that it is not paid by a third party. CAC has replaced ‘old-fashioned’ expensive testing for ischemia. High CAC scores have been shown to enhance compliance with lifestyle behavior and help patients decide on a long-term treatment strategy in the absence of symptoms.

  10. Assess adherence and percentage response to LDL-C–lowering medications and lifestyle changes with repeat lipid measurement 4 to 12 weeks after statin initiation or dose adjustment, repeated every 3 to 12 months as needed. Define responses to lifestyle and statin therapy by percentage reductions in LDL-C levels compared with baseline. In ASCVD patients at very high-risk, triggers for adding nonstatin drugs are defined by threshold LDL-C levels ≥70 mg/dl (≥1.8 mmol/L) on maximal statin therapy (see #3).
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