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Insulin Resistance Syndrome
Aka: Insulin Resistance Syndrome, Impaired Glucose Tolerance, Impaired Fasting Glucose, Insulin Resistance, Glucose Intolerance, Metabolic Syndrome, Syndrome X- See Also
- Diabetes Mellitus
- Type I Diabetes Mellitus
- Type II Diabetes Mellitus
- Glucose Metabolism
- Diabetes Mellitus Education
- Diabetes Mellitus Complications
- Diabetic Ketoacidosis
- Hyperosmolar Hyperglycemic State
- Diabetes Mellitus Control in Hospital
- Diabetes Mellitus Glucose Management
- Hypertension in Diabetes Mellitus
- Hyperlipidemia in Diabetes Mellitus
- Diabetic Retinopathy
- Diabetic Nephropathy
- Diabetic Neuropathy
- Epidemiology
- Prevalence in U.S.
- Total estimated at 70-80 million
- Affects 25% of adults and 4% of teens
- Prevalence in U.S.
- Pathophysiology
- Diminished Insulin response results in hyperinsulinemia
- Hyperinsulinemia predisposes to cardiovascular disease
- Precursor to Type II Diabetes Mellitus
- Risk Factors
- Strong Family History of Diabetes Mellitus
- Prior Gestational Diabetes Mellitus or Fetal Macrosomia
- Obesity
- Body Mass Index 30 kg/m2 or higher
- Waist to hip ratio increased
- Men: 1.0 or higher
- Women: 0.8 or higher
- Diagnosis: Three or more conditions below
- Insulin Resistance (see labs below)
- Hypertension (Blood Pressure 130/85 or higher)
- Seen in up to 40% of Metabolic Syndrome patients
- Hyperlipidemia (see labs below)
- Coronary Artery Disease
- Polycystic Ovary Syndrome
- Acanthosis Nigricans
- HAIR-AN Syndrome
- Abdominal Obesity
- Men with Waist Circumference >40 inches or 102 cm
- Women with Waist Circumference >35 inches or 88 cm
- Labs
- Screening Indications
- See Risk Factors above
- Body Mass Index >25 kg/m2
- Family History of Diabetes Mellitus
- Prior history of Gestational Diabetes
- Age over 45 years
- HDL Cholesterol <35 mg/dl
- Serum Triglycerides >250 mg/dl
- Polycystic Ovary Syndrome
- Hypertension
- Impaired Glucose Metabolism
- Fasting Glucose: 100 to 125 mg/dl
- Known as Impaired Fasting Glucose
- New guidelines suggest bottom cut-off of 100 mg/dl
- Metabolic Syndrome defined as 110 mg/dl or higher
- Two hour Glucose Tolerance Test (75 g): 140-199 mg/dl
- Known as Impaired Glucose Tolerance
- Fasting Glucose: 100 to 125 mg/dl
- Lipid Profile
- Serum Triglycerides >150 mg/dl
- Serum very Low Density Lipoprotein (VLDL) increased
- Serum HDL Cholesterol decreased
- Men <40 mg/dl
- Women <50 mg/dl
- Best lab markers for Insulin Resistance
- Plasma Insulin level (or Glucose to Insulin Ratio)
- Plasma Triglyceride levels
- Triglyceride to HDL ratio
- McLaughlin (2003) Ann Intern Med 139:802-9
- Screening Indications
- Management: Prevention of progression to Diabetes
- Moderate aerobic Exercise for 30 minutes every day
- Example: Brisk walking for total of 150 min/week
- Decreased caloric intake
- Keep fat intake <30% with saturated fat <10%
- Salad, vegetables, fruits
- Whole grains and legumes
- Fish high in Omega-3 Fatty Acids and lean meats
- Reduce intake of simple sugars
- Foods associated with improved Insulin sensitivity
- Coffee
- Cinammon (1/2 teaspoon per day)
- Appears to have Insulin-like activity
- May increase Insulin sensitivity
- Improves lipid profile
- Khan (2003) Diabetes Care 26(12):3215-8
- Moderate Alcohol consumption
- Weight Reduction (lose 7-15% of prior weight)
- Increase Dietary Fiber to 15 gram per 1000 calories
- Cardiac Risk Management
- Same as Diabetes Mellitus and Coronary Artery Disease
- Aspirin 81 mg PO qd
- Hyperlipidemia
- LDL Cholesterol <100 mg/dl
- HDL Cholesterol >40 mg/dl (50 mg/dl in women)
- Triglycerides <150 mg/dl
- Statins are preferred agents
- Hypertension
- Goal Blood Pressure < 125/75 mmhg
- Consider ACE Inhibitor or Angiotensin Blocker
- Consider pharmacologic agents for Glucose control
- References
- Moderate aerobic Exercise for 30 minutes every day
- Course
- High risk for Type II Diabetes Mellitus
- Diabetes Prevention Program (DPP)
- Basic diet and Exercise: 11% develop diabetes/year
- Metformin 850 bid/diet/Exercise: 7.8% develop DM/year
- Intensive diet, Exercise: 4.8% develop diabetes/year
- Classes and coaches
- Weight Reduction of 7%
- Reference
- References