Dyslipidemia Flashcards
What is dyslipidemia?
Presence of one or more of the following:
1. Elevation in total cholesterol
2. Elevation in LDL cholesterol
3. Elevation in triglycerides
4. Low HDL cholesterol
What are the main plasma lipids?
Cholesterol, triglycerides, and phospholipids
What is the function of plasma lipids?
- Essential for cell membrane
- Hormone synthesis
- Source of free fatty acids
What are the classes of lipoproteins?
- Chylomicrons
- LDL
- VLDL
- HDL
What is total cholesterol?
What is the function of chylomicrons and VLDL?
Deliver energy rich triacylglycerol (TAG) to cells in the body -> free fatty acids and monoglycerides
What is the function of just LDL?
LDL delivers cholesterol to cells → cholesterol is used in membranes or for the synthe sis of steroid hormones
What is the function of HDL?
HDL brings back excess cholesterol to the liver (reverse cholesterol transport)
What are the apolipoprotiens that can be used as lab values?
ApoLp(a) and B-100
What are the effects and outcomes of DLD?
- Excess LDL → atherosclerosis
- Excess TG → pancreatitis
What is the function of ApoLp(a)? Where is it located?
LDL, HDL
Bound to B100 preventing LDL uptake by B and E receptor
What are the normal functions of vascular endothelium?
- Control of vascular tone
- Maintenance of an antithrombotic surface
- Control of inflammatory cell adhesions and diapedesis
What is the function of B100? Where is it located?
VDLD, LDL, IDL
Necessary for assembly and secretion of VLVL from the liver
What happens if there is a disruption of vascular endothelium?
- Inappropriate constriction
- Luminal thrombus formation
- Abnormal interactions between blood cells (monocytes and platelets)
- Activated vascular endothelium
What is an atherosclerotic plaque?
Subintimal collections of fat, smooth muscle cells, fibroblasts and intracellular matrix
What is the impact of having atherosclerotic plaques?
→ stenosis or rupture → CVD, MI, stroke, PVD, abdominal aortic aneurysm, death
What are the requirements for there to be stenosis?
- 50% diameter reduction → limitation in ability to meet increased demand
- 80% reduction → reduced flow at rest or minimal stress
What is desirable total cholesterol level? High?
<200 mg/dL (<5.17 mmol/L)
≥240
What is the optimal LDL level? Very high?
<100 mg/dL (<2.59 mmol/L)
≥190
What is considered low HDL? High?
<40 mg/dL (<1.03 mmol/L)
≥60
What is considered normal TG levels?
<150 mg/dL (<1.70 mmol/L)
What is considered very high TG levels?
≥500 mg/dL (≥5.65 mmol/L)
What are clinical signs of heterozygote familial hypercholesterolemia?
Development of xanthomas as an adult and vascular disease at 30-50 years
What are clinical signs of homozygote familial hypercholesterolemia?
Development of xanthomas as adults and vascular disease in childhood
What are the secondary causes of hypercholesterolemia?
- Hypothyroidism
- Obstructive liver disease
- Nephrotic syndrome
- Anorexia nervosa
- Acute intermittent porphyria
- Drugs
What are drugs that can cause secondary hypercholesterolemia?
- Beta blocker
- Immunosuppresants (PI, cyclosporine, mirtazapine, sirolimus)
- GC
- Progestin
- Thiazide
- Isotretinoin
What are the clinical signs of familial LPL deficiency?
Pancreatisits
What drugs can elevate TG?
- Alcohol
- Estrogens
- Isotretinoin
- Beta blockers
- GC
- Bile acid resins
- Thiazides
What are the causes of lower HDL? Drugs?
- Malnutrition
- Obesity
Non-ISA beta blockers
Anabolic steroids
Probucol
Isotretinoin
Progestins
What are causes of hypocholesterolemia?
- Malnutrition
- Malabsorption
- Myeloproliferative diseases
- Chronic infectious diseases (AIDS, TB)
- Monoclonal gammopathy
- Chronic liver disease
How should we measure LDL-C and Non-HDL-C
How do you use the Friedewald equation?
LDL-C = (TC) – (triglycerides /5) – (HDL-C)
Not accurate when TG are over 400 or LDL <70
How do you use martin/hopkins equation
LDL-C = TC – HDL-C – TG/novel factor
Not accurate when TG are over 400
What are the biomarkers of measuring cholesterol?
- apoB
- Lp(a)
When is apoB used?
HyperTG (>200)
> 130 is LDL (≥160)
Expensive and unreliable
When is Lp(a) used?
For family and personal hx of premature ASCVD not explained by major risk factors
Why are some cormobidities of lipid abnormality?
- CVD
- Secondary causes
- Xanthomas
- DM
What are atherosclerosis risk factors?
- Older age >40
- Cigarette smoking
- DM
- DLD (Increased LDL, low HDL)
- HTN
- Hyperhomosysteinemia
- CKD
- CHF
What are ASCVD events?
- Acute coronary disease (ACS)
- MI
- Stable/unstable angina
- Coronary or revascularization (catheter)
- Stroke/transient ischemic attack (TIA)
- Peripheral arterial disease (PAD)
The ASCVD risk estimator ____ South Asians while it ____ East Asians
underestimate; overestimate
What are ASCVD risk categories?
Low: <5%
Borderline: 5-7.4%
Intermediate: 7.5-19.9%
High: ≥20%
What are the clinical presentations of metabolic syndrome?
- Low HDL
- High TG
- Visceral obesity
- Insulin resistance
- HTN
What are the ASCVD prevention groups?
- Secondary prevention
- Severe hypercholesterolemia
- DM in adults
- Primary prevention
What is secondary ASCVD?
Already had a health incident related to atherosclerosis
How falls in secondary prevention?
ASCVD risk
What do you always suggest before treating ASCVD?
Non-pharm
How do you treat secondary prevention if patients aren’t at high risk?
What is the LDL goal for secondary prevention?
> 70
How do you treat secondary prevention if patients are at high risk?
What is considered high risk ASCVD?
2 ASCVD events or 1 event and high risk conditions
What are the numbers for severe hypercholesterolemia?
≥190
What the is schedule for treating severe HCA? When is a PCSK9 used?
How do we treat secondary prevention in patients with DM?
What are DM-specific risk enhancers for ASCVD?
- ≥10 yr of DMT2 or ≥20 DMT1
- Albuminuria (≥30)
- GFR <60
- Retinopathy
- Neuropathy
- ABI <0.9
What is the LDL goal in DM secondary prevention?
<100
What is primary ASCVD?
Prevent any occurrence of disease?
How do you treat primary prevention based on ASCVD events?
How do you treat primary prevention based on age?
What are the ASCVD risk enhancers for primary prevention?
- Family hx of ASCVD
- LDL ≥160
- CKD
- Metabolic syndrome
- Women
- Inflammatory disease
- Ethnicity factors
What is coronary artery calcium?
Scan measuring the amount of calcium in the wall of the coronary arteries using a specialized x-ray machine
Deposits with plaque buildup
What is the scoring for CAC?
CAC score of 0 = low ASCVD 10-year risk (w/o cancelling high risk comorbidities)
CAC score of ≥ 100 = 10-year risk of ASCVD ≥ 7.5%
What is primary prevention in older adults
- 75+ with LDL of 70-189 → moderate intensity statin
- 75+ reasonable to stop stain if risk outweighs benefits
- 76-80 with LDL of 70-189 → measure CAC (avoid statin if score is 0)
What is primary prevention for young adults?
Teach them how to eat healthy
Eliminate risk factors
Be aware of elevations
When should you screen for primary prevention?
- familial hx of genetic dyslipidemia or early CVD
- Obesity or metabolic risk
- screened once between ages 9-11 and then again between 17-21 years
What do you do when abnormalities are contributed to obesity? Genetics?
Intense lifestyle therapy
Statin initiation
What should ASCVD diets consist of? Exclusions?
Veggies, fruit, whole grains, fiber, low fat dairy, protein, veggie oils
Sweets, sugary beverages, red meats, saturated fats and cholesterol
What type of diet is associated with HLD?
TLC
Exercise rec?
150 min/week
Statin contraindications?
Pregnancy and nursing
High intensity statins? Dosing?
Atorvastatin (Lipitor): 40, 80 mg
Rosuvastatin (Crestor): 20, 40 mg
Moderate intensity statins? Dosing?
Atorvastatin (Lipitor): 10, 20
Rosuvastatin (Crestor): 5, 10
Simvastatin (Zocor): 20-40
Pravastatin (Pravachol): 40, 80
Lovastatin (Mevachor): 40, 80
Fluvastatin (Lescol): 40 BID
Low intensity statin? Dosing?
Pravastatin (Pravachol): 10-20
Lovastatin (Mevachor): 20
What are the t1/2 of high intensity statins?
Crestor: 19hr
Lipitor: 14hr
What statins are metabolized by CYP3A4?
- Atorvastatin
- Fluvastatin (minor)
- Lovastatin
- Simvastatin
What statins are metabolized by CYP2C9?
- Fluvastatin
- Pitavastatin
- Rosuvastatin
What are DDIs of statins?
Fenofibrate (less ADR) < Gemfibrozil (rhabdomyolysis)
Equivalence of Atovstatin:Rosuvastatin
4:1
What is 1st line for all patients with DLD?
Statin
What statins can be doses at anytime?
- Atorvastatin
- Fluvastatin XL
- Pitavastatin
- Rosuvastatin
Why are most statins given at night?
Maximum LDL-C reduction
Short t1/2 statins?
Fluvastatin, Lovastatin, Pravastatin, Simvastatin
What are the major enzymes that metabolize statins?
CYP3A4, 2C9
What populations have no sensitivity to statins?
Hispanic, AA
How do Asians respond to statins?
- Higher rosuvastatin plasma levels are seen in Japanese, Chinese, Malay, and Asian Indians as compared with whites → lowering of dose
- Japanese may be sensitive to statins
- Caution with titrating up
What are the non stain classes?
- Zetia
- BAS
- PCSK9 Inhibitors and Inclisiran
- Bempedoic Acid
What is the second line agent of DLD?
Ezetimibe (Zetia)
Effect and ADRs of Zetia?
- LDL and TG reduction
- HDL raise
Mild GI complaints like diarrhea
BAS effect? ADRs? CI?
- LDL reduction
- HDL and TG raise
- Colesevelam is for DMT2 to reduce AIC
Constipation and nausea
TG>300
What is the first line agent for pregnancy?
BAS
Counseling point of BAS?
- binding of other medications → separate administration
1 hr before or 4 hrs after - Take w/ food
PCSK9? Effects? ADRs? Dosing?
Alirocumab (Praluent), Evolocumab (Repatha)
LDL reduction
Flu-like symptoms (decrease by room temp before use)
Expensive (Not first line for insurance); Bi-weekly or once a month
What is Inclisiran?
Leqvio is a siRNA that reduces the production of PCSK9 by inhibiting mRNA
LDL reduction
Add on to statin, SQ injection
What are effects and ADRs of bempendoic acid?
Modest LDL reduction
Hyperuricemia and tendon rupture
What are the populations at risk for DLD?
- Ethnicity
- HyperTG
- Women
- CKD
- Chronic inflammatory disorders and HIV
Asian with ASCVD, Lipid, Metabolic Issues?
South asia have increased risk
Lower levels of HDL, and higher LDL and TG prevalence
Increased MetA with lower waist circumference
Hispanic with ASCVD, Lipid, Metabolic Issues?
Women have low HDL
DM is disproportionally present
AA with ASCVD, Lipid, Metabolic Issues?
Women increases ASCVD risk
High levels of HDL and low TG
Increased DM and HTN
What is the difference between moderate and severe hyperTG?
Moderate: Excess TG are carried in VLDL
Severe: Elevated VLDL plus chylomicrons
How do you treat hyperTG?
- 20 or older with hyperTG → lifestyle factors, secondary factors, medications
- 4-75 moderate and ASCVD 7.5% or higher → favoring initiation or intensification of statin therapy
- 40-75 sev
- severe and ASCVD 7.5% or higher → statin therapy
- Fasting TG ≥1000 → non pharm and vibrate therapy
How should women be treated with DKD?
- No statins for pregnancy
- Stop statins 1-2 months before pregnancy is attempted
CKD recommendations of DLD?
1
CKD that is considered elevated risk of ASCVD?
Reduced eGFR (<60)
Presence of albuminuria ≥30
What is the treatment for chronic inflammatory disorders and HIV?
Lifestyle improvements should be tried for 3-6 months after diagnosis
What are statin alternatives?
- Niacin
- Fibrates
- Omega 3
- Lomitapide
- Mipomersen
Niacin effects? ADRs? Counseling points?
LDL and TG decrease, HDL increase
GI intolerance, flushing/itching, lab abnormalities
Use of aspirin, taking with meals, and slowly titrating the dose upward may minimize flushing/itching
Fibrate effects? ADRs?
Decrease TG and LDL, Raises HDL
Dose adjustment for renal dysfunction
Gallstones, bleeding risk
Omega 3 effects?
Lower TG, raise LDL and HDL
Vascepa vs Lovaza?
Viscera supports CV risk reduction
ADR of Omega 3?
Fishy burps, Increased bleeding with anti-platelets and coags
Lomitapidide?
Only for HoFH → REMS due to hepatotoxicity
Mipomersen?
Only for HoFH → REMS due to hepatotoxicity
When to monitor efficacy?
- Follow up about 3-6 months after lifestyle therapy modifications
- Follow up about 4-12 weeks after pharmacologic therapy initiation or titration
- Once stable, monitoring is done every 6 months to a year
Lab monitoring of DLD toxicity?
- LFTs
- Glucose
- CBC/BMP
- CK
Last line for Primary DLD?
- Partial ileal bypass
- Portocaval shunts
- Plasma exchange
- LDL-apheresis
- Liver transplantation