Hyperlipidemia (5 questions) Flashcards
Approximately ____ % of adults in the US-a total cholesterol of ≥240mg/dL; _____% of all U.S. -a total cholesterol > 200mg/dL.
25~ 30% - ≥240mg/dL
>50% - > 200mg/dL.
Types of lipoproteins
- Chylomicrons
- Very low density lipoprotein (VLDL)
- Intermediate density lipoprotein (IDL)
- Low density lipoprotein cholesterol (LDL-C)
- High density lipoprotein cholesterol (HDL-C) (cardioprotective
Composition of lipoproteins
- a lipid core containing cholesterol ester and triglycerides
- An outer layer of phospholipids and apo-proteins is wrapped around the core
- One molecule of Apo B is present for each LDL
Significance of Apo B
- One molecule of Apo B is present for each LDL
- This allows lipoproteins to travel in the blood
- They are very small particles and are more atherogenic than normal size
(We don’t routinely measure Apo B)
Explain the exogenous pathway
- Cholesterol and TG from diet travel through GI system to small intestine and are packaged into Chylomicrons
- These are transported and deposited in muscle and fat tissue
- Some break down into free fatty acid for energy
- Others are taken to the liver where they bind to LDL receptor (most LDL receptors in liver – genetic probs, consider)
- The liver metabolizes cholesterol into bile for elimination in feces

Explain the endogenous pathway
- In the liver, cholesterol & TG are made into VLDL, transported to muscle and fat tissue and broken down for energy and storage
- VLDLs break down into IDL
- Some IDL return to liver, others break down into fat and muscle tissues to form LDL
- LDL binds to LDL receptor and is taken into cells for cell wall synthesis
- Excessive LDL goes int oblood
- macrophages – foam cells - plaque*

5 atheroprotective roles of HDL
- Reverse Cholesterol Transport
- Antioxidant property
- Maintenance of endothelial function
- Protection against thrombosis
- Low blood viscosity via permitting red cell deformability (high blood viscosity related to inflammation)
ATP III: when should adults begin getting lipid profile screening, and how often?
over age 20- lipid profile every 5 years
Who should get screened for lipids regardless of age?
- Atherosclerosis, other CHD, DM, Metabolic syndromes or HTN regardless of age
- FHx of premature CVD
- Clinical hyperlipidemia (Xanthomas, Acanthosis nigrans, Arcus corneus)
- CRF, Erectile dysfunction, HIV infection with HAART tx, autoimmune diz (lupus, RA, psoriasis)
When should we start screening lipids in children of patients w/ severe dyslipidemia?
start at the age of 10
Goal of dyslipidemia management
prevent future ASCVD
- Definition: Clinical ASCVD (acute coronary syndrome, hx of MI, stable or unstable angina, coronary or other arterial revascularization, stroke , TIA or peripheral arterial disease based on RCT inclusion criteria)
- Primary and secondary prevention
Examples of primary, secondary, and tertiary prevention in the context of ASCVD
- Primary: diet. For anyone w/history of CAD, checking lipids for screening
- Secondary: had MI last year and you are treating them
- Tertiary: full blown symptoms, trying to slow progression/stop symptoms

normally think prmary prevents dz, secondary detects and cures while asymptomatic, tertiary reduces complications
When did ATP III come out?
2001
What is involved in ATP III screening?
- Determine lipoprotein levels using a 9-12 hour fast (most require 12)
- Identify presence of clinical atherosclerotic disease that confer high risk for CHD or equivalent
- Determine the presence of major risk factors
- If 2+ risk factors (other than LDL) are present w/o CHD or CHD equivalent, assess 10-yr risk
- Determine risk category
Why is a fasting lipid panel recommended?
TGs increase after food–
new evidence shows may not change >10%, so not so important
Secondary causes of elevated LDL and TG
Diet, medications, comorbid conditions, disordered/altered metabolism
altered metabolism is most common

ATP III Guidelines: Total cholesterol (mg/dL)
Optimal/desirable, near optimal, borderline high, high
- Optimal/desirable:
- borderline high: 200-239
- high: > 240
ATP III Guidelines: LDL cholesterol (mg/dL)
Optimal/desirable, near optimal, borderline high, high
- Optimal/desirable:
- near optimal:
- borderline high: 130-159
- high: 160-189
- very high: _>_190
ATP III Guidelines: TGs (mg/dL)
Optimal/desirable, borderline high, high
- Optimal/desirable:
- near optimal
- borderline high: 150-199
- high: _>_200
ATP III Guidelines: HDL Cholesterol (mg/dL)
Optimal/desirable, near optimal
- Optimal/desirable: > 60
- Low: < 40 men, < 50 women
ATP III Guidelines
Former guidelines based on risk factors

2013 ACC/AHA Guidelines
- Replaced ATP III
- no longer to Tx LDL chol targets
- Non statin therpay discouraged in most cases
- Lifestyle modification rec’d for all pts
- 10yr ASCVD risk calculator - risk category determines what level of statin therapy
Presence of clinical atherosclerotic disease that confer high risk for CHD or equivalent (ATP III)
- Clinical CHD
- Symptomatic carotid artery disease
- Peripheral arterial disease
- Abdominal aortic aneurysm.
Major risk factors for ACVD (ATP III)
- Cigarette smoking
- HTN (BP > 140/90 or on antiHTN med
- Low HDL (<40mg/dL)
- FH premature CHD (CHD in male 1st degree relative <55yo, CHD in female first degree relative <65yo)
- Age (men > 45yo, women > 55yo)






