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Type 1 Diabetes in Adults
  • Francine Ratner Kaufman, M.D.
  • Distinguished Professor of Pediatrics
  • The Keck School of Medicine of USC
  • Head, Center for Diabetes and Endocrinology
  • Childrens Hospital Los Angele
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Prevalence of Diabetes
in the United States
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Incidence of Type 1 Diabetes
  • Incidence increasing by 3.4% per year
  • 50% of patients diagnosed before age 20 years
  • 50% of patients diagnosed after age 20 years
    • Often mistaken for type 2 diabetes—may make up 10% to 30% of individuals diagnosed with type 2 diabetes
    • Oral agents ineffective; insulin therapy required
    • Autoimmune process slower and possibly different
    • Can usually be confirmed by beta cell antibodies
    • Loss of c-peptide
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Making the Diagnosis of Type 1 Diabetes
  • Symptoms of diabetes Polyuria, polydipsia, polyphagia, diabetic
  • plus ketoacidosis (DKA)
  • Random plasma glucose ³200 mg/dL*


  • Fasting plasma glucose (FPG) ³126 mg/dL*


  • Oral glucose tolerance
    test (OGTT) with 2-hour value ³200 mg/dL*
  •   Loss of c-peptide c-peptide<0.8 ng/dL
  • Presence of islet autoantibodies GADA, ICA, IA-2A, IAA
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Natural History of “Pre”–Type 1 Diabetes
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Rationale for Intensive Therapy
of Type 1 Diabetes



Glucose Control Is Critical
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Risk of Progression of Microvascular Complications vs A1C            DCCT
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Intensive Therapy for Diabetes:
Reduction in Incidence of Complications
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Long-term Microvascular Risk Reduction
in Type 1 Diabetes
Combined DCCT-EDIC
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Cost-Effectiveness of Intensive
Therapy in Type 1 Diabetes
DCCT Modeling Study
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Current Targets for Glycemic Control
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Action Profiles of Insulins
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Normal Daily Plasma Insulin Profile
Nondiabetic Obese Individuals
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Basal/Bolus Treatment Program with Rapid-acting and Basal Analogs
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Physiologic Multiple Injection Regimens
The Basal-Bolus Insulin Concept
  • Basal insulin
    • Controls glucose production between meals and overnight
    • Near-constant levels
    • Usually ~50% of daily needs
  • Bolus insulin (mealtime or prandial)
    • Limits hyperglycemia after meals
    • Immediate rise and sharp peak at 1 hour postmeal
    • 10% to 20% of total daily insulin requirement at each meal
  • For ideal insulin replacement therapy, each component should come from a different insulin with a specific profile or via an insulin pump (with one insulin)
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Basal-bolus Therapy:
    • More frequent decision making, testing, and insulin dosing
    • Allows for variable food consumption based on  hunger level
    • Ability to skip meal or snack if desired (bedtime)
    • Reduced variability of insulin absorption
    • Easy to adapt to acute changes in schedule (exercise, sleeping in on weekends)


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Insulin Injection Devices
  •  Insulin pens
  • Faster and easier
    than syringes
    • Improve patient attitude and adherence
    • Have accurate dosing mechanisms, but inadequate resuspension of NPH may be a problem


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Mealtime Insulin and Severe Hypoglycemia
Aspart vs Regular Insulin
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Insulin Pumps
Continuous Subcutaneous Insulin Infusion (CSII)
  • For motivated patients
  • Expensive
  • External, programmable pump connected to an indwelling subcutaneous catheter
    • Only rapid-acting insulin
    • Programmable basal rates
    • Bolus dose without extra injection
    • New pumps with dose calculator function
    • Bolus history
  • Requires support system of qualified providers
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CSII vs Multiple Injections of Insulin
Meta-analyses
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Balancing Risk of Severe Hypoglycemia Against the Risk of Complications
DCCT
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Hypoglycemia
Risk Factors
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Weight Gain
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Elderly Treatment Considerations
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Special Considerations in the Elderly
With Type 1 Diabetes
  • Intensive therapy/tight control for otherwise healthy elderly patients
  • Less strict glycemic goals for elderly patients with severe complications or comorbidities or with cognitive impairment
    • FPG <140 mg/dL
    • PPG <220 mg/dL

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Risk of Hypoglycemia in the Elderly
  • Erratic eating (quantities)


  • Erratic timing of meals


  • Renal impairment
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Treatment Challenges in the Elderly
With Type 1 Diabetes
  • Lack of thirst perception predisposes to hyperosmolar state
  • Confusion of polyuria with urinary incontinence or bladder dysfunction
  • Increased risk of and from hypoglycemia
    • Altered perception of hypoglycemic symptoms
    • Susceptibility to serious injury from falls or accidents
  • Compounding of diabetic complications by effects of aging
  • Frequent concurrent illnesses and/or medications
  • More frequent and severe foot problems
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Monitoring Outcomes and
Managing Risk Factors
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Follow-up Visits
Monitoring of Target Values:
Cardiovascular Risk Factors
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Follow-up Visits
Quarterly Evaluations
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Follow-up Visits
Annual Evaluations
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Diabetes as a Risk Equivalent of CAD
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ABCs of CVD Risk Management
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ABCs of CVD Risk Management (cont.)
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ABCs of CVD Risk Management (cont.)
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Management of Cardiovascular Risk in Diabetes
Blood Pressure Control
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Management of Cardiovascular Risk in Diabetes
LDL Control
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The Future of Type 1 Diabetes Care
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Emerging Type 1 Diabetes Therapies
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Inhaled Insulin in Type 1 Diabetes
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New Class of Agents for Diabetes
  • Pramlintide
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Glucose Flux in Healthy Subjects
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Multihormonal Regulation of Glucose Appearance and Disappearance
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Pramlintide Improves Postprandial Glucose
TYPE 1 DIABETES
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Pramlintide Clinical Effects
TYPE 1 DIABETES COMBINED PIVOTALS
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Adverse Events* ³5%
PRAMLINTIDE TYPE 1 DIABETES STUDIES
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Continuous Glucose Monitoring
  • Benefits of continuous glucose monitoring
    • More complete glucose profile than with traditional SMBG
    • Tracking of meal-related glycemic trends
    • Detection of nocturnal hypoglycemia
    • Facilitation of changes in insulin regimens
    • Alarm for highs and lows (GlucoWatch)
  • Remaining challenges
    • Daily SMBG still required
    • Not suited to many patients
    • Limited accuracy, especially for hypoglycemia
    • Glycemic pattern results confusing, subject to interpretation
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Future Glucose Monitors
  • Minimally invasive continuous glucose monitors
  • Implanted glucose sensors
  • Implanted insulin pumps
  • “Closed-loop” systems
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Can Type 1 Diabetes Be “Cured?”
Islet Cell Transplantation
  • 7 Type 1 Patients, Aged 29 to 54 Years, With History of Severe Hypoglycemia and Metabolic Instability
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