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Approach to the Management of Hypertriglyceridemia Timothy A. Denton, M.D. Attending Cardiologist High Desert Heart Institute Victorville, CA
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Outline Lipids / Triglyceride metabolism Etiology of hypertriglyceridemia Therapy of hypertriglyceridemia Special considerations
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Can you identify these?
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VLDL B100 CI CII CIII E IDL B100 E LDL B100 Chylomicrons B100 CI CII CIII E AI AII AIV B48 Remnants B48 E HDL2 AI AII AI AII HDL3 HDL1 AI AII
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VLDL Chylomicrons Remnants HDL2 IDL LDL HDL1 HDL3 50-90 A 90-120 A 120-180 A 180-280 A 250-350 A 300-800 A 800-5000 A >300 A
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Egg McMuffin Calories290 Calories from fat110 Total fat12 g Saturated fat4.5 g Cholesterol235 mg Sodium790 mg Carbohydrates27g Protein17g http://www.mcdonalds.com/countries/usa/
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Chylomycron Production Intestinal Brush Border
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Triglyceride Concentration over Time Ng et al. Arterio Thromb Vasc Biol 1995;15:2157-2164
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C = 8 - 24 Fatty Acids Lipids HO O Triglycerides O O O O O O Phospholipids O O O O O P G O O
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HO Cholesterol O Cholesterol Ester Fatty Acid OHC O + H O H C O
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Fatty Acids Number of carbons are multiples of 2 (from Acetyl-CoA) Length of FA Short chain = 2-6 carbons Medium chain = 8-14 carbons Long chain = 16 + Saturated FA contain no double bonds Monounsaturated FA contain 1 double bond Polyunsaturated FA (PUFA) contain 2 or more double bonds Many, many other types of FA
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Fatty Acids C H H C H H C H C H C H H C H H cis trans C H H C H H C H CC H H C H H H C H H C H H C H H C H H C H H C Cis is GOOD C H H C H H C H C C H H C H H H Trans is BAD
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PUFA (polyunsaturated fatty acid) Nomenclature 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Common name - -Linoleic acid Systematic name - all cis-9,12-octadecadienoic acid Systematic name - cis-9, cis-12-octadecadienoic acid Chemist’s name - 18:2 (9Z, 12Z) (Z=cis, E=trans) Chemist’s name - 18:2 9,12 (assume cis, indicate trans) Nutritionist’s name #1 - 18:2 (n-6) Nutritionist’s name #2 - 18:2 -6 HO O 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
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REALLY, REALLY Essential Fatty Acids HO O Linoleic acid (18:2, n-6) HO O -Linolenic acid (18:3, n-3) Corn oil Cotton seed oil Linseed oil (flax) Rapeseed (canola) oil Soya oil Walnut oil, walnuts Peanuts Beef Spinach Fish oils eicosa docosa Sardines, Salmon, Mackerel, Cod, Halibut, Herring, Trout, Tuna, Haddock
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Lipid Metabolism Gut LIPOPROTEIN LIPASE Fatty acids Chylomicron remnant Liver Chylomicron VLDL IDL LDL What you make What you eat 1,000 mg/day 300 mg/day Bile
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Lipemia
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Apo B-48 Chylomicron Metabolism Apo A-1 Apo C-II Apo A-IV Gut Apo E Apo C-III LIPOPROTEIN LIPASE Fatty acids Apo A-1, A-IV Apo C-II, C-III Chylomicron remnant = cholesterol = triglyceride = phospholipid Liver = cholesterol ester
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Fatty Acid Transport Triglyceride-rich lipoprotein Lipoprotein lipase Apo C-II Fatty acids Triglyceride synthesis lipase Triglyceride storage Energy FATTY ACID-ALBUMIN COMPLEXES Liver Adipose tissue Muscle Fatty acids
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LDL and IDL
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Metabolism of VLDL Apo B-100 Apo E Nascent VLDL Mature VLDL VLDL Remnant LDL Liver LIPOPROTEIN LIPASE HDL Cholesterol esters Apo E Apo C-II,C-III Phospholipids Fatty acids HDL Apo C-II, C-III Apo C-III Apo C-II Fibrates
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Etiology Genetic Familial dysbetalipoproteinemia Familial combined hyperlipoproteinemia Familial hypertriglyceridemia (unknown) LPL deficiency / inhibition Apo C-II deficiency (LPL activator) Apo E defects / Apo E-2 Acquired Diet Alcohol Uremia Pregnancy Drug use Hypothyroidism
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Fredrickson Classification
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LDL Cholesterol Goals and Cutpoints for Therapeutic Lifestyle Changes (TLC) and Drug Therapy in Different Risk Categories 190 (160–189: LDL- lowering drug optional) 160 <160 0–1 Risk Factor 10-year risk 10–20%: 130 10-year risk <10%: 160 130 <130 2+ Risk Factors (10-year risk 20%) 130 (100–129: drug optional) 100 <100 CHD or CHD Risk Equivalents (10-year risk >20%) LDL Level at Which to Consider Drug Therapy (mg/dL) LDL Level at Which to Initiate Therapeutic Lifestyle Changes (TLC) (mg/dL) LDL Goal (mg/dL) Risk Category
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Approach to the treatment of Hypertriglyceridemia Elevated TG’s >200 mg/dl “Abdominal” TG’s >500-1000 mg/dl
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Therapy of Hypertriglyceridemia Underlying cause Diet Drugs Plasmapheresis Special considerations
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Underlying Cause EtOH DM Obesity HIV drugs
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Underlying Cause
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Central Obesity Contributes to Insulin Resistance Abdominal fat: high rate of FA turnover high rate of lipolysis
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Classic Diabetic Lipid Pattern Low HDL High LDL High TG’s
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HIV Drugs HIV itself Protease inhibitors Unclear etiology High TG’s (800-3000 mg/dl) Low HDL (as low as 1 mg/dl) High LDL (300-800 mg/dl)
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Diet
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Ornish D, et al. Lancet 1990;336:129 Lifestyle Heart Trial
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Ornish D, et al. Lancet 1990;336:129 Lifestyle Heart Trial
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Dietary Goals NOT total fat reduction Total fat 10-20%
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Partial Ileal Bypass
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POSCH -- Program On Surgical Control of Hyperlipidemias Arch Int Med 1998;158:1253
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Drugs Statins Niacin Fibrates Fish oil
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Statins Jones et al. Am J Cardiol2003;92:152 Prava Simva Atorv Rosuva
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Niacin Nicotinic acid Niacin (Vit B 3 ) N O HO N O NH 2 Nicotinamide (no antilipemic activity)
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Niacin Forms
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Niacin Onset of Action
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Apo B Pathway Apo B-100 Apo E Nascent VLDL Mature VLDL VLDL Remnant LDL Liver LIPOPROTEIN LIPASE HDL Cholesterol esters Apo E Apo C-II,C-III Phospholipids Fatty acids HDL Apo C-II, C-III Apo C-III Apo C-II Niacin
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Fibrates
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Effect of Fibrates on Lipid Levels VA-HIT NEJM 1999;341:410 Increased Lipoprotein lipase activity Increased liver uptake of FA, decreased TG production Increased LDL affinity for receptor Lower exchange between LDL and VLDL Increased HDL production PPARs
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Effect of Fibrates on Lipid Levels VA-HIT NEJM 1999;341:410
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Effect of FenoFibrate on Lipid Levels
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LDL Profile of Fenofibrate Caslake; Arterioscler Thromb 1993:13;702-11 % Change TCLDL-C LDL Receptor Uptake Large Buoyant LDL Small Dense LDL
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BIP Bezafibrate Infarction Prevention Study Circulation 2000;102:21-27
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Diabetes Atherosclerosis Intervention Study DAIS 1. DM II, with and without coronary intervention 2. Randomized, prospective fenofibrate vs placebo 3. 418 randomized 4. Follow-up - 39.6 months 5. End-points minimum lumen diameter mean segment diameter mean % stenosis
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Diabetes Atherosclerosis Intervention Study DAIS P=0.02 P=0.03 P=0.17
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Fenofibrate Adverse Events Generally well tolerated Most frequent discontinuation - rash (6% vs 2%) Other events: pruritis, constipation, diarrhea G.I. Upset 2% ( less than placebo) LFTs elevations 6.3% vs 2.1% for placebo Increased warfarin levels (monitor INR)
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PPARs are the CENTER of the UNIVERSE Peroxisome Proliferator Activated Receptor PPARα -- Fibrates PPARγ -- Thiazolidinediones
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PPARα Stimulation: 1.Reduces production of Apo CIII (inhibitor of lipolysis) 2.Activates Lipoprotein Lipase 3.Fall in TG levels 4.Switch from small dense to large “fluffy” LDL 5.Increases synthesis of Apo AI and AII
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Fish Oil n-3 PUFA’s Epidemiologic data on survival GISSI-Prevenzione Effects on Triglycerides
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Fish Oil 9 patients 6 weeks 1 g/d N-3 PUFA 1 U tocopherol/d 6 weeks 5 g/d fish oil Slower VLDL and LDL oxidation Hau et al. Arterio Thromb Vasc Biol 1996;16:1197
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Fish Oil vs Gemfibrozil Gemfibrozil 1,200 mg/d Fish oil 4g/day Stalenhoef et al Atherosclerosis 2000;153:129
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n-3 PUFA’s and SCD Albert et al NEJM 2002;346:1113
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GISSI-Prevenzione GISSI group, Lancet 1999;354:447
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Mediterranian Diet J. THOMSON "Chart of the Mediterranean Sea" Edin.18I7
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Lyon Heart Trial De Lorgeril et al Circulation 1999;99:779 First MI Randomized Mediterranian vs Prudent 5 year trial stopped early <35% energy as fat <10% energy saturated fat <4% energy as linoleic acid >0.6% of energy as alpha-linolenic (18:3 or n-3) Eat more bread Eat more fish, less meat Eat more vegetables Must have fruit every day All butter and margarine replaced with olive oil and canola oil
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Lyon Heart Trial De Lorgeril et al Circulation 1999;99:779 Survival with: No MI Survival with: No MI Angina CHF CVA PE Periph embol Survival with: No MI Angina CHF CVA PE Periph embol Stable angina PTCA, CABG Restenosis
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Lyon Heart Trial De Lorgeril et al Circulation 1999;99:779 Differences in LDL-C
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Plasmapheresis Apheresis = Pheresis = Hemapheresis Apheresis -- (Latin, Greek -- aphairesis) to take out, take away, snatch, detach, separation,or abstract.
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Combination Therapy Statin + niacin Statin + fibrate Statin + ezetimibe Statin + resin When in doubt, drop the statin to 20% of maximum dose, Add second drug Titrate up while watching symptoms and LFT’s
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Combination Therapy 2. The dose of simvastatin should not exceed 10 mg daily in patients receiving concomitant medication with gemfibrozil. The combined use of simvastatin with gemfibrozil should be avoided, unless the benefits are likely to outweigh the increased risks of this drug combination. Caution should be used when prescribing other lipid-lowering drugs (other fibrates or lipid-lowering doses (1 g/day) of niacin) with simvastatin, as these agents can cause myopathy when given alone. The benefit of further alterations in lipid levels by the combined use of simvastatin with fibrates or niacin should be carefully weighed against the potential risks of these combinations. Addition of fibrates or niacin to simvastatin typically provides little additional reduction in LDL-C, but further reductions of TG and further increases in HDL-C may be obtained. Zocor Package Insert
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Combination Therapy Crestor Package Insert Fenofibrate: Coadministration of fenofibrate (67 mg three times daily) with rosuvastatin (10 mg) resulted in no significant changes in plasma concentrations of rosuvastatin or fenofibrate (see PRECAUTIONS, Drug Interactions, and WARNINGS, Myopathy/Rhabdomyolysis). Gemfibrozil: Coadministration of gemfibrozil (600 mg twice daily for 7 days) with rosuvastatin (80 mg) resulted in a 90% and 120% increase for AUC and Cmax of rosuvastatin, respectively. This increase is considered to be clinically significant (see PRECAUTIONS, Drug Interactions, WARNINGS, Myopathy/Rhabdomyolysis, DOSAGE AND ADMINISTRATION).
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Special Considerations
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Central Obesity Contributes to Insulin Resistance Abdominal fat: high rate of FA turnover high rate of lipolysis
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Diabetes and Lipids Elevated LDL Elevated TG’s Low HDL
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LDL Sizing Ultracentrifugation NMR Gel elecrophoresis
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A B
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Diabetes Atherosclerosis Intervention Study DAIS 1. DM II, with and without coronary intervention 2. Randomized, prospective fenofibrate vs placebo 3. 418 randomized 4. Follow-up - 39.6 months 5. End-points minimum lumen diameter mean segment diameter mean % stenosis
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Diabetes Atherosclerosis Intervention Study DAIS * = P < 0.001 ** = P < 0.05 Change in Percentage Diameter Stenosis
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Effect of Exercise on Lipids Kokkinos Arch Int Med 1995:155:415 2906 men age 30-64 years exercise treadmill test to exhaustion classified into 6 groups based on average miles run per week
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Effect of Exercise on Lipids Kokkinos Arch Int Med 1995:155:415
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Trans-Fatty Acids Lichtenstein NEJM 1999;340:1933
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Trans-Fatty Acids Lichtenstein NEJM 1999;340:1933
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Summary Elevated TG’s are a risk factor atherosclerosis pancreatitis Treat underlying cause Use fibrates early Use in combination carefully
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End
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Hypertriglyceridemia Familial chylomicronemia deficiency or inhibitor of LPL or activator Apo C-II eruptive xanthomas, abdominal pain diet Rx -- short-chain fatty acids Dysbetaliproproteinemia homozygous for Apo E-2 high IDL -- chylo and VLDL remnants accumulate diet therapy Familial endogenous hypertriglyceridemia Familial combined hyperlipidemia
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Diet
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Digestion
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