the metabolic syndrome lecture
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The Metabolic Syndrome LectureTRANSCRIPT
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The Metabolic Syndrome By
Alicia Rodriguez
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The Metabolic Syndrome
• Formerly called Syndrome X
• Associated with abdominal obesity
• Clustering of a group of risk factors for chronic diseases
– CVD
– CKD
– Type 2 DM
Insulin Resistance
Glucose Intolerance
Hyperinsulinemia
High TG
Low HDL-C
Hypertension
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Features of the Metabolic Syndrome
• Central adiposity
• ↑ plasma triglycerides
• ↓ HDL cholesterol
• Hyperglycemia
• Hypertension
• Smaller LDL-C particles
• Abnormal clotting
• Abnormal inflammatory markers
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Criteria for Clinical Diagnosis • A syndrome is a set of
symptoms rather than a
disease
• Developed by NCEP
ATP III
• Clinical diagnosis based
on any 3 of the 5
symptoms associated
with metabolic syndrome
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Pathophysiology • Central adiposity is related to high amounts of fat in
visceral compartments
• Visceral fat sites are composed of large insulin resistant adipocytes
• Present in adipocytes is the hormone adiponectin which: – Stimulates glucose uptake and fatty acid oxidation in muscle
– Increases insulin sensitivity in liver
– Reduces monocyte adhesion and formation of foam cells
• As visceral fat increases, the presence of this hormone decreases leading to: – Increased insulin resistance
– Formation of plaque in the wall of blood vessels
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Pathophysiology • Increased size of fat cells:
– Raises levels of circulating free fatty acids
– Increases levels of circulating cytokines
• Increased lipolysis leads to:
– Increased synthesis of LDL-C and VLDL-C in the liver
– Increased levels of triglycerides and cholesterol in blood plasma
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Copyright ©2008 American Heart Association
Kotronen, A. et al. Arterioscler Thromb Vasc Biol 2008;28:27-38
Schematic representation of how components of the metabolic syndrome relate to fat accumulation in the liver
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Copyright ©2008 American Heart Association
Kotronen, A. et al. Arterioscler Thromb Vasc Biol 2008;28:27-38
NAFL and MetS predicts type 2 diabetes, advanced forms of liver, and cardiovascular disease
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Populations at Risk • Males and post menopausal women
• Some ethnic groups – Mexican Americans
– Caucasians
– African Americans
– South Asians
• Additional risk factors – Sedentary lifestyle
– Abdominal obesity
– Family history of diabetes or heart disease
– Personal history of diabetes or heart disease
– Polycystic ovarian syndrome
– Non-alcoholic fatty liver disease
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40–49
Prevalence of the NCEP Metabolic Syndrome: NHANES III by Age
Ford ES et al. JAMA 2002. Used with permission of the American Medical Association.
Pre
vale
nce,
%
20–70+
Age, years
20–29 30–39 50–59 60–69 70
Men
Women
24% 23%
8% 6%
44% 44%
0%
10%
20%
30%
40%
50%
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0%
10%
20%
30%
40%
Prevalence of the NCEP Metabolic Syndrome: NHANES III by Sex and Race/Ethnicity
Pre
vale
nce,
%
Men Women
White
African American
Mexican American
Other
25%
16%
28%
21% 23%
26%
36%
20%
Ford ES et al. JAMA 2002. Used with permission of the American Medical Association.
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Treatment of the Metabolic Syndrome • All obese individuals, especially those with central adiposity
should be identified and treated for weight loss
• Strategies include
– Lifestyle changes
• Weight Loss
– Reduction in energy intake
– Increase in physical activity
• Other dietary changes
– Fish oil and omega 3 fatty acids?
–Diacylglycerol (DGA) oil?
–Alcohol?
–DASH eating plan
– Pharmacotherapy
– Surgery
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The Effect of Fish Oil /N3 Fatty Acids
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The Effect of Fish Oil /N3 Fatty Acids
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The Effect of Diacylglycerol (DGA) Oil
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Treatment of the Metabolic Syndrome The ABCDE approach • Acronym stands for:
– Assessment – Blood pressure – Cholesterol – Diabetes prevention and diet – Exercise
• Multidisciplinary team includes: – Physicians – Health educators – Nurses – Registered dietitians – Exercise physiologists
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Focal Points
• The metabolic syndrome increases the risk for diabetes and cardiovascular disease
• Most individuals with metabolic syndrome have insulin resistance and obesity
• Initial therapy for the metabolic syndrome should consist of weight loss through increased physical activity and calorie restriction
• More research needs to be conducted to standardize definition and treatment plan
• Recognizing and treating metabolic syndrome in an early stage could save health care dollars