Chapter 29: Hyperlipidemics (9) Flashcards
Lipids are classified as
Triglycerides, phospholipids, sterols
Triglycerides
Neutral fats
most common (90% of lipids in body)
major storage form of fat in body
Phospholipids
Essential to building plasma membranes
lecithins are in egg yolks and soybeans
Sterols
Best know sterol is cholesterol
- cholesterol promotes atherosclerosis
Lipoproteins are
Predictors of cardiovascular disease
High density lipoprotein (HDL)
Contains most apoprotein
Low density lipoprotein (LDL)
Contains most cholesterol
Very low density lipoprotein (VLDL)
Primary carrier of triglycerides in blood
Hyperlipidemia
High levels of lipids in blood
Hypercholesterolemia
Elevated blood cholesterol
Dyslipidemia
Abnormal levels of lipoproteins
Hypertriglyceridemia
Increase in triglyceride levels
How do patients often present with lipid disorders
Often asymptomatic until progression to chest pain or HTN
Long term consequences of being unaware of hyperlipidemia?
CV disease
Blood lipid profiles
important diagnostic tools in guiding the therapy of dyslipidemias
LDL : HDL Ratio
Goal to MAXIMIZE HDL, and MINIMIZE LDL
What should the LDL: HDL ratio be in men and women
Men: Ratio should be less than 5
Women: Ratio should be less than 4.5
Lipoprotein
subclass of LDL strongly associated with plaque formation and heart disease
Apoloipoprotein B (ApoB)
A protein that is involved in the metabolism of lipids
main protein constituent of lipoproteins such as VLDL and LDL
Cholesterol (total) goal
< 5.2 mmol/L
HDL recommend range
> 0.91mmol/L
LDL recommended range
<3.4mmol/L
Triglycerides recommended range
0.45-1.71 mmol/L - <2.20 mmol/l
ApoB range
40-125 mg/dL
What ApoB range is considered desirable in low or intermediate risk individuals
100mg/dL
What ApoB range is considered desirable in high risk individuals?
80mg/dL
What are some nonpharmacologic management things
monitor blood lipids regularly
maintain optimal weight
exercise 30mins 3-5 days/wk minimum
What are dietary modifications
Reduce intake of saturated fats and cholesterol
increase intake of soluble fibre
eliminate tobacco
increase intake of plant sterols
minimize alcohol (especially beer)
Statins are
the most effective drugs for reducing blood lipid levels, recommended first line therapy
what is HMG-CoA reductase
primary regulatory enzyme for cholesterol biosynthesis
inhibited by statins
Statins can reduce LDL by
20-40%
Statins can also lower
triglyceride and VLDL levels
Statins can raise
HDL levels
Primary prevention
administering statins to patients with no Hx of CV disease
Secondary prevention
slowing progression and reducing mortality in patients with Hx
How many statins are there currently?
Seven
- all have similar actions and ADEs
- all given orally and tolerated well by most
What are 3 important pieces to remember with statins?
- Watch liver
- No grapefruit juice (>1L)
- Stop if myopathies occur
Rhabdomyolysis
Rapid breakdown of muscle fibers
rare but serious ADE of statins
Statin pregnancy category
X = DEATH
Statin prototype drug
Atorvastatin
Atorvastatin therapeutic
Antihyperlipidemic
Atorvastatin Pharmacologic
HMG-CoA reductase inhibitor
Atorvastatin uses
Hypercholesterolemia
family hypercholesterolemia
Atorvastatin MOA
Inhibits HMG-CoA reductase
liver makes less cholesterol and responds by making more LDL receptors to remove cholesterol from blood
Atorvastatin ADEs
Headache
intestinal cramping
diarrhea
constipation
Atorvastatin Serious ADE
Rhabdomyolysis
Atorvastatin contraindications
Pregnancy (X)
Lactation
Caution with hepatic imairment
Atorvastatin Drug Interactions
May increase digoxin levels
May increase OCP levels
Erythromycin increase
risk of rhabsomylosis increase with macrolide antibiotics, cyclosporine, and azole antifungals
grapefruit juice inhibits metabolism of statins
Atorvastatin Considerations
- obtain baseline lipid values
- monitor LDL cholesterol levels
- Assess lipid lab tests within 2 to 4 weeks of initiation of therapy or change in dose
- assess foreigns of rhabdomyolysis or myopathies
- observe for digoxin toxicity
- watch for hepatotoxicity - changes In stool, jaundice, bleeding/bruising, abd distention
- no grapefruit
- NO ALCOHOL
Bile acid sequestrants are
often combined with statins to reduce LDL cholesterol levels
What are bile acid sequestrates capable of?
Producing 20% drop in LDL cholesterol
tend to cause more frequent ADEs in GI tract
Bile acid sequestrate Prototype drug?
Cholestyramine
Cholestyramine therapeutic
Antihyperlipidemic
Cholestyramine pharmacologic
Bile acid sequestrate
Cholestyramine uses
Hypercholesterolemia
- elevated LDL
Cholestyramine MOA
Binds to bile acids
forms insoluble complex containing cholesterol that is excreted in feces
lowers LDL levels by increasing LDL receptors on hepatocytes
Cholestyramine ADEs
constipation
bloating
belching
nausea
Cholestyramine Serious ADEs
Obstruction of GI tract
hypercholermic acidosis
malabsorption syndrome
Cholestyramine Contraindications
Complete biliary obstruction
serum triglycerides > 400mg/dL
hypertryglyceridemia
pregnancy
GI disorders
Cholestyramine Drug Interactions
Dogixin, penicillin, ironsupplement, thyroid hormone, thiazides reduce effects
warfarin increases effects
Cholestyramine Considerations
- completely dissolve powder before administration
- increase fluid intake
- assess for early signs of hypothrombinemia
- monitor lab tests for therapeutic effectiveness
- consult prescriber to see if supplemental vitamins A and D and folic acid are required in LTC
Niacin can
reduce triglycerides and LDL cholesterol levels, but ADEs limit its usefulness
Niacin is a
B complex vitamin
decreases production of VLD
produces more ADEs than statins
additive effects with other drugs
instruct patients not to self medicate
Fibric acid drugs
lower triglyceride levels but have little effect on LDL cholesterol
Types of fibric acid drugs
Fenofibrate
fenofibric acid
gemfibrozil
have little effect on LDL cholesterol but preferred for treating severe hypertriglyceridemia
Fabric acid prototype
Gemfibrozil
Gemfibrozil therapeutic
antihyperlipidemic
Gemfibrozil Pharmacologic
Fibric acid agent
Gemfibrozil uses
hypertriglyceridemia and VLDL
second line therapy after statins
Gemfibrozil MOA
specific MOA Unknown
inhibits breakdown of stored fat
Gemfibrozil ADEs:
Abdominal cramping
D/N
dyspepsia
headache
dizziness
peripheral neuropathy
diminished libido
Gemfibrozil serious ADEs
Cholelithiasis
anemia
eosinophilia
bleeding
Gemfibrozil contraindications/precautions
gallbladder disease
serious liver impairment
renal impairment
Gemfibrozil drug interactions
statins
increased risk of myositis and rhabdomyolysis
Anticoagulatns
increased risk of bleeding
Antidiabetic
enhanced hypoglycemic effects
Gemfibrozil considerations
monitor lab tests
consult prescriber if inadequate response after 3 months
educate pt drug will cause bloating and gas
watch for bleeding
Miscellaneous drug for dyslipidemias
Ezetimibe