India has a large pool of diabetic patients
ICMR-INDIAB study – extrapolated estimations suggest 62.4 million people with diabetes and 77.2 million are prediabetic
Estimates show ~ 85.5% men and 97.8% women who are diabetic in India have concomitant dyslipidemia
Z Score,T Score, Percential Rank and Box Plot Graph
Diabetic dyslipidemia
1.
2. Lipoprotein Metabolism
Introduction to Diabetic dyslipidemia
Extent of Diabetic dyslipidemia in India
Lipid metabolism in Diabetes Mellitus
Guidelines
Treatment
Recent advances in the management
2
3. Lipoproteins – macromolecules that transport hydrophobic lipids
(triglycerides, cholesterol & fat-soluble vitamins) through body
fluids (plasma, interstitial fluid, and lymph) to and from tissues.
Lipoproteins contain a core of hydrophobic lipids (triglycerides and
cholesteryl esters) surrounded by hydrophilic lipids (phospholipids,
unesterified cholesterol) and proteins that interact with body fluids.
3
4. Lipoprotein Metabolism 4
• 5 classes of lipoproteins classified based on the density
• Most plasma triglyceride is transported in chylomicrons or VLDLs
• Most plasma cholesterol is carried as cholesteryl esters in LDLs and HDLs.
5. Proteins associated with lipoproteins – apolipoproteins
Assembly, structure, and function of lipoproteins
Activate enzymes of lipoprotein metabolism & are ligands for cell-
surface receptors
ApoA-I - found on virtually all HDL particles
ApoA-II - second most abundant HDL apolipoprotein found on about
2/3rd of all HDL particles
ApoB - major structural protein of chylomicrons, VLDLs, IDLs, and
LDLs (apoB48 and apoB100)
ApoE is present on chylomicrons, VLDLs, and IDLs & Three
apolipoproteins of the C series - metabolism and clearance of
triglyceride-rich particles
Lipoprotein Metabolism 5
8. Cardiovascular disease - more common in diabetic patients than in
the general population
Dyslipidemia – common in patients with both types of diabetes.
Hyperglycemia –microvascular complications
Dyslipidemia –macrovascular complications
Elevated low-density lipoprotein cholesterol (LDL-C) is a major risk
factor for CVD
Aggressive lipid treatment goals have been recommended for
patients with type 2 diabetes
8
10. Insulin resistance contributes to this characteristic dyslipidemia
Propensity to develop atherosclerotic disease - much higher in these
patients – also called Atherosclerotic Diabetic Dyslipidemia (ADD)
Disturbance of lipid metabolism – early event, potentially preceding
the disease by several years.
Monitoring of the conventional (LDL-C) may be misleading in
diabetic patients– requires specific monitoring
Introduction 10
12. India has a large pool of diabetic patients
ICMR-INDIAB study – extrapolated estimations suggest 62.4 million
people with diabetes and 77.2 million are prediabetic
Estimates show ~ 85.5% men and 97.8% women who are diabetic
in India have concomitant dyslipidemia
Extent of DD in India 12
13. 13
Research in 2004 forecast that the Indian
diabetic population would reach ~80 million
by 2030
Extent of DD in India
15. Extent of DD in India 15
85.5%
97.8 %85.5 %
Prevalence of Dyslipidemia (%) in
Male T2 DM
Prevalence of Dyslipidemia (%)
in Female T2DM
In India
• Nearly 90% Indian diabetics compared to 72% worldwide
• >55 millions patients of diabetic dyslipidemia in India
16. Factors affecting higher prevalence in indians
1. Diet
• Dyslipidemic profile - seen in vegetarians
• Indian diets rich in carbohydrate and low in Omega-3 PUFA-
exacerbates hypertriglyceridemia
2. Physical Activity
• Asian Indians-more physically inactive
3. Genetic Factors
• Abnormal variants of ApoC 3 and ApoE 3 genes common in India
• The "Starvation Gene Theory"
4. Body composition
• Excess body fat in relation to body mass index
• High waist-to-hip ratio
• High intra-abdominal fat
Extent of DD in India
16
17. Extent of DD in India
17
Lipid Relative Serum Concentrations
TC Similar
LDL-C Similar (129 Vs 124 mg/dL)
sd-LDL-C Similar
TG Higher (174.5 Vs 146 mg/dL)
HDL-C Lower (40.5 Vs 46.4 mg/dL)
Comparison of Indian vs. Western Dyslipidemia
22. Triglycerides and VLDL
Hypertriglyceridemia – secondary to increase in VLDL
Triglycerides increase by 50 – 100% above baseline only
If TG >400 mg/dl – likely genetic defect in lipoprotein metabolism
High VLDL and TG - due to increased substrate* flow into liver
VLDL does not get cleared easily
VLDL – apoB is over produced, but triglycerides increase more than
apoB – Thus VLDL is richer in TG (increased ratio of triglyceride to
apoB )
Lipid metabolism in Diabetes 22
23. Triglycerides and VLDL
Increased VLDL α Insulin resisitance
a) Glucose and Fatty acid levels - Increased substrate into the liver for
VLDL synthesis
b) Triglycerides in the liver inhibit apoB degradation – Increased
secretion of VLDL
c) Lipoprotein lipase levels reduced in insulin resistance – reduced VLDL
clearance
Altered VLDL composition - contributes to the atherosclerotic
propensity
Lipid metabolism in Diabetes 23
24. Lipid metabolism in Diabetes 24
Lipoprotein Alterations
VLDL ↑ • Increased production of triglyceride and apoB
• Decreased clearance of triglyceride and apoB
• Abnormal composition
LDL ↑ • Increased production of LDL apoB
• Triglyceride enrichment
• Decreased receptor mediated clearance
• Smaller (more dense) particle distribution
• Glycation
• Oxidation
HDL ↓ • Increased clearance of apoA
• Decreased proportion of large HDL
• Triglyceride enrichment
• Glycation
• Diminished reverse cholesterol transport
25. LIPOPROTEINS IN TYPE 1 DIABETES
Triglyceride-rich lipoproteins - increased hypertriglyceridemia
Severe insulin deficiency in DKA – Poor lipoprotein lipase activity –
poor clearance of TG rich cholesterol molecules
As TG rich molecules are not catabolized, LDL particles remain same or
low
HDL decreases in a mechanism similar to Type 2 Diabetes (High VLDL
– High rate of TG transfer to HDL – faster clearance)
Lipid metabolism in Diabetes 25
26. Widespread agreement that LDL cholesterol should be less than
130 mg/dL in almost all persons with diabetes
American Diabetes Association recommends an LDL-cholesterol
goal of less than 100 mg/dL in diabetic persons.
Most persons with diabetes will require an LDL-lowering drug to
reach the LDL goal of <100 mg/dL.
26
27. Using Non-HDL-C as a marker for Diabetic Dyslipidemia
Presently Non-HDL cholesterol – 2nd therapeutic target (according
to the ATP III & AACE 2012) in individuals with triglyceride levels >
200 mg/dl
Non-HDL-C (Total cholesterol – HDL) – ApoB containing cholesterol
Need not be a fasting sample
LDL-C unreliable as a predictor of CV events when on lipid lowering
agents, while Non-HDL-C continue to be a good predictor even on
therapy*
Non-HDL-C recommended normal levels are 30 mg/dl higher than
LDL-C thresholds
Very simple to calculate (unlike apoB)
Guidelines 27
28. • Non–HDL-C is as good as or better than LDL-C in the prediction of
future cardiovascular events
JAMA. 2005;294:326-333
• When triglycerides are between 200- 500 mg/dl a non–HDL-C
calculation provides better risk assessment than LDL-C alone
AACE 2012 dyslipidemia guidelines (ENDOCRINE PRACTICE Vol 18 (Suppl 1) March/April 2012:1-78)
• Non-HDL outperforms Apo-B for prediction of CVD: A meta-analysis of
25 trials (n=131,134) on lipid lowering therapy
Am J Cardiol 2012;110: 1468–1476
• Among statin-treated patients, the strength of this association with CVD
is greater for non–HDL-C than for LDL-C and ApoB
JAMA. 2012;307(12):1302-1309
Non-HDL-C is a better indicator of residual risk than
LDL-C
Guidelines 28
29. Global Guidelines (Goal for TG)
ESC
< 150 mg/dl
AHA
ACC
ADA
Guidelines 29
TG Designate
1984 NIH
Consensus
Panel
1993 NCEP
Guidelines
2001 NCEP
Guidelines
2011 AHA
Statement
<100
(optimal)Desirable <250 <200 <150
Triglyceride Goals over time
30. At fasting TG<100 mg/dL, 85% population has predominant large buoyant LDL
particles while if fasting TG>250 mg/dL 85% of population has predominant
sd-LDL-C particles.
Austin et al, Circulation.
1990; 82:495-506
Pattern B: a
predominance of small,
dense LDL particles
Pattern A: large, more
buoyant LDL particles
predominate
Relevance of TG<100 mg/dL - lower the TG
lower the sd-LDL-C
Guidelines 30
31. Guidelines 31
NCEP – ATP III Guidelines
Other targets
• Total Cholesterol < 200 mg/dl
• HDL-C > 40 mg/dl
32. American Heart Association guidelines 2013
The expert panel identified 4 groups that would benefit from
statin therapy:
1) Individuals with clinical ASCVD
2) Individuals with LDL >190 mg/dl
3) Individuals with Diabetes mellitus, 40-75 yrs with LDL 70-189
mg/dl and without clinical ASCVD
4) Individuals without clinical ASCVD or Diabetes mellitus with
LDL 70-189 mg/dl and estimated 10-year ASCVD risk >7.5%
Guidelines 32
33. American Diabetes Association guidelines
1. LDL Cholesterol: Less than 100 mg/dl
2. HDL Cholesterol: Higher than 40 mg/dl for men and 50 mg/dl for
women
3. Triglycerides: Less than 150 mg/dl
Guidelines
33
34. 1. Lifestyle changes (TLC)
2. Pharmacologic therapy
i. Lipid management
ii. Anti-diabetic therapy
3. Combination therapy
4. New agents
34
35. 1. Therapeutic lifestyle changes (TLC) includes the following:
Treatment of diabetic dyslipidemia 35
LDL reduction
8-10%
3-5%
6-15%
3-5%
20-30%
Cumulatively
36. Examples of Moderate Physical Activity in Healthy Adults*
Brisk walking (4-7 kmph) for 30–40 minutes
Swimming—laps for 20 minutes
Bicycling for pleasure or transportation, 8 km in 30 minutes
Volleyball (noncompetitive) for 45 minutes
Home care—heavy cleaning
Basketball for 15–20 minutes
Social dancing for 30 minutes
Treatment of diabetic dyslipidemia 36
38. 2. Pharmacological therapy
A. Lipid lowering therapy
Statins (HMG Co-A reductase inhibitors) -initial
pharmacological treatment for lowering LDL-C in
diabetics
Effects on HDL-C and other lipoproteins may also play a
role
Decrease in CHD and total mortality, myocardial
infarctions, revascularization procedures, stroke and
peripheral vascular disease
Treatment of diabetic dyslipidemia 38
39. HMG Co-A reductase inhibitors
Pleotropic effects* (anti-inflammatory & NO mediated
vasodilation)
Reductions in triglycerides 7-30%
If TG <150 mg/dl – reduction is inconsistent, but if
>200 mg/dl, the drop is significant
Statins reduce the concentration of all LDL particles,
(including the small LDL particles) as well as IDL and
VLDL remnants.
Generally given at night but Atorvastatin - very long
half-life morning administration equally effective
Treatment of diabetic dyslipidemia 39
42. Fibric acid derivatives (fibrates)
The fibrates are primarily used for
lowering triglycerides (~50%)
Agonists for the nuclear transcription
factor peroxisome proliferator-
activated receptor-alpha (PPAR-
alpha).
Beneficial effect on cardiovascular
outcomes - not been observed in all
large fibrate trials*
There is concern about an increase in
the non cardiac mortality in patients
on long term fibrates
Treatment of diabetic dyslipidemia 42
44. Omega–3 fatty acids
Treatment of diabetic dyslipidemia 44
PATIENT POPULATION RECOMMENDATION
No documented history of CHD Eat a variety of fish (preferably oily)
at least twice per week. Include oils
and foods rich in alphalinolenic acid
(flaxseeds and walnuts).
Documented history of CHD Consume approximately 1 g of EPA
plus DHA daily, preferably from oily
fish. EPA plus DHA capsule
supplements may be used in
consultation with a physician.
Needs to lower triglyceride level Consume 2 to 4 g of EPA plus DHA
daily in capsules in consultation with
a physician.
45. Nicotinic acid
Niacin - most effective agent for raising HDL-C levels, high doses can
worsen hyperglycemia
LDL cholesterol - ↓ 5–25%
HDL cholesterol - ↑ 15–35%
Triglycerides - ↓ 20–50%
Flushing, itching, nausea, gastrointestinal upset, hypotension, and
tachycardia – common
Combination lipid-lowering therapy (statin with a fibrate or niacin)
The risk of myopathy –greater in niacin + statin
Niacin plus laropiprant - a prostaglandin D2 receptor antagonist
reduces flushing
Treatment of diabetic dyslipidemia 45
46. Bile acid sequestrants
Sequestrants add to the LDL-lowering effects of other drugs, notably
statins
Bind bile acids in the intestine through anion exchange; reducing
enterohepatic recirculation of bile acids
10 g/day cholestyramine or 10–20 g/day colestipol reduce LDL by
10–20 %
Colesevelam – much more potent (12-18%)
Combining with statins – LDL reduction upto 44% reported
Other drugs should be taken an hour before or 4 hours after
administration of the sequestrant (absorption)*
Treatment of diabetic dyslipidemia 46
48. Others
Ezetimibe, a selective cholesterol absorption inhibitor in the
intestine - an effective lipid-lowering agent
Can also be used in combination with statin therapy
Ezetimibe plus atorvastatin, for example, can provide LDL-C
lowering equivalent to that achieved with high-dose atorvastatin
Adjunctive therapy in patients with type 2 diabetes who
inadequately respond to statins
Treatment of diabetic dyslipidemia 48
49. Insulin sensitizers
Drugs that improve insulin resistance may have effects on lipid
levels, especially TG levels
Alter the ratio of lipoproteins in HDL towards more anti-
atherogenic HDL particles
Metformin has been shown to reduce LDL-C, TC, and TG levels
and increase HDL-C
The other class of insulin sensitizers – PPARγ agonists
(Thiazolidenediones) are very effective in improving the lipid
profile
Treatment of diabetic dyslipidemia 49
50. Insulin sensitizers
Pioglitazone has been shown to
reduce TG levels and increase
HDL-C* when used as an add-on
therapy in patients with type 2
diabetes who are already
receiving metformin or
sulfonylurea therapy
Pioglitazone increases LDL
particle size and decreases LDL
oxidation
Adv effects - Peripheral edema,
CHF, weight gain, fractures,
macular edema.
Treatment of diabetic dyslipidemia 50
52. Saroglitazar – world’s first drug targeting diabetic dyslipidemia
Discovered in 2001 – approved 2013
Dual action – PPARα and PPARγ agonist
Completely different in structure compared to Thiazolidinediones
TZD ring – known to cause edema and weight gain in PPARγ
agonists – absent in Saroglitazar
Also binds to PPARα stronger than Fenofibrate
Recent advances 52
53. PPARα > PPARγ
Conclusions of preclinical trials
Safe, well tolerated
No hepatotoxic, nephrotoxic, cardiotoxic or myotoxic effects
Not teratogenic
Usual dose 0.5 – 4 mg /day
Recent advances 53
54. Conclusions of Clinical trials
Reduced Triglycerides by ~45%
Reduced LDL by ~5%
Reduced VLDL by ~ 45%
Reduced ApoB by ~11%
Reduced FBS and HbA1c levels
2.5 times more patients met all 3 criteria of NCP-ATP III in
Saroglitazar + Atorvastatin group vs. Atorvastatin only
Adverse effects – Gastritis, pyrexia (mild)
Recent advances 54
55. 1. Diabetic Dyslipidemia is highly prevalent in the Indian diabetic
population
2. Dyslipidemia in diabetes differs significantly with
hypertriglyceridemia and small dense LDL-C
3. Non-HDL-C is a better indicator of CV risk than LDL-C in diabetic
patients
4. Most diabetic patients do not achieve optimum lipid targets
despite present treatment options
5. Saroglitazar – novel drug approved for the metabolic changes in
Diabetic dyslipidemia
55
56. Joslin’s Diabetes Mellitus – 14th Ed
Harrison's Principles of Internal Medicine, 18th Ed
Goodman & Gilman’s - The Pharmacological Basis of Therapeutics -
12th Ed
Mechanisms in Medicine – Animated Video Library
NCEP ATP III Guidelines booklet
Treatment of Diabetic Dyslipidemia - Vijayaraghavan Lipids in
Health and Disease 2010, 9:144
Aggressive Approach to Diabetic dyslipidemia J Am Osteopath Assoc.
2009;109(suppl 1):S2-S7
Association of Physicians of India – Medicine Update Vol 24.2 | 2014
56
Notes de l'éditeur
Apo AI synthesized in the liver and intestine
The human liver synthesizes apoB100, and the intestine makes apoB48, (same gene involved )
INTERHEART Study 2004
Physical Activity:
Asian Indians are more physically inactive as compared to many other ethnic groups** May be due to fast economic development in recent years**
Genetic Factors:
variants of Apo C3(cause Lipo lipase inhibition) and ApoE3 (formation of VLDL) genes are common in India which can lead to more dyslipidemia^
Indians have excessive body fat and more abdominal adiposity which is harmful even if BMI is under control*
Indians more prone to Syndrome X - The "Starvation Gene Theory" India suffered droughts for hundreds of years. Fats and carbohydrates provide energy to the body. So our genes adapted to survive long periods of drought by consuming fats and carbohydrates slowly to make them last longer
Now our bodies get adequate supplies of food, but these genes are still in action as they take a long time to adapt, so our food continues to be metabolised slowly resulting in the dysfunctional biochemical profile that constitutes Syndrome X.
*Glucose and Free Fatty acid
Lipo lipase in adipose – insulin increases activity – resistance reduces activity
Opposite in muscle
Type 2 diabetics have an increased rate of HDL clearance – Apo AI and AII are cleared faster
Neither Total Chol or HDL are affected by meals – TG is and LDL is calculated = TC-HDL-TG/5
TNT (treating to new targets) & IDEAL (Incremental decrease in endpoints through aggressive lipid lowering)
28
Secondary causes of elevated triglycerides: diabetes mellitus, chronic renal failure, nephrotic syndrome, Cushing’s disease, lipodystrophy,
pregnancy, and various drugs (corticosteroids, beta-blockers, retinoids,
oral estrogens [not transcutaneous estrogen], tomoxifen, protease inhibitors for
AIDS).
ESC : European Society of Cardiology
AHA: American Heart Association
ACC: American College of Cardiology
ADA: American Diabetes Association
A following reference suggests that 85 % of total LDL will be Small Dense LDL(sdLDL). when TG is 250. so to reduce the sdLDL,TG should be reduced to 100 mg/dl (when sdLDL is just 15%). As sdLDL is known to be more atherogenic, keeping TG at 200-250 may not reduce atherosclerosis completely. and target of TG < 100 mg/dl may be considered.
ALP – Atherogenic Lipoprotein Phenotype
"A threshold appears to exist for a fasting TG concentration above which there will be a predominance of small, dense LDL particles(pattern B) and below which large, more buoyant particles will predominate (pattern A). The TG concentration that produces a shift from one subclass pattern to another varies with each patient. At a fasting TG concentration ,100 mg/dL, 85% of the population has pattern A, whereas at a fasting TG concentration .250 mg/dL, 85% will have pattern B
17. Thus, lowering the TG concentration from 600 mg/dL to 260 mg/dL is unlikely to change a patient’s LDL particle size because most patients have a threshold for shifting LDL subclass pattern within the range of 100 to 250 mg/dL"
DM – CHD Equivalent
Risk Factors
Cigarette smoking
Hypertension (BP 140/90 mmHg or on antihypertensive medication)
Low HDL cholesterol (<40 mg/dl)* - HDL cholesterol 60 mg/dL counts as a "negative" risk factor; its presence removes one risk factor from the total count
Family history of premature CHD (CHD in male first degree relative <55 years; CHD in female first degree relative <65 years)
Age (men 45 years; women 55 years)
Saturated - cream, cheese, butter, ghee
50-70% of maximum heart rate
Unsat – avacados, nuts, meat, fish
mediated by inhibition of isoprenoids, which serve as lipid attachments for intracellular signaling molecules.
Elevated hepatic transaminases generally occur in <2% of cases and are dose-dependent, usually transient.
Progression to liver failure is exceedingly rare
Discontinued only if enzymes >3 ULN
Myopathy is common, however most cases are not related to statins.
Muscle aches, soreness, or weakness, and elevated creatine kinase levels – significant myopathy
Elevated hepatic transaminases generally occur in <2% of cases and are dose-dependent, usually transient.
Progression to liver failure is exceedingly rare
Discontinued only if enzymes >3 ULN
Myopathy is common, however most cases are not related to statins.
Muscle aches, soreness, or weakness, and elevated creatine kinase levels – significant myopathy
*FIELD (Fenofibrate Intervention and Event Lowering in Diabetes)
Concomitant therapy with statin and fibrate increases risk of muscle related Adverse events esp gemfibrozil
Colesevelam exception
Colesevelam exception
Rosiglitazone on the other hand increase LDL-C, TC, and HDL-C levels
Rosiglitazone on the other hand increase LDL-C, TC, and HDL-C levels
Rosiglitazone may increase risk of CV disease
Pioglitazone banned and revoked – bladder cancer
Predominantly alpha activity with optimal gamma activity
Predominantly alpha activity with optimal gamma activity