october 16, 2015 mary-anne doyle, md endocrinology and metabolism treatment of diabetes
TRANSCRIPT
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October 16, 2015Mary-Anne Doyle, MD
Endocrinology and Metabolism
Treatment of Diabetes
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ObjectivesDiscuss the main principles of therapy for type 1
diabetes including diet, exercise, blood glucose monitoring, oral hypoglycemic agents and insulin administration
Discuss the management of type 2 diabetes including diet, exercise, blood glucose monitoring, oral hypoglycemic agents and insulin
Review steps of insulin administration
Compare the mechanisms of action of the available types of oral hypoglycemic agents.
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Case: Type 1 DiabetesJulie is a 17 yo F with type 1 diabetes mellitus.
She was diagnosed at the age of 7 when she developed symptoms of polyuria, polydipsia and polyphagia.
She is currently on: glargine 20u SC q evening and aspart with meals.
Her carbohydrate ratio is 1:10 with all meals and she uses a correction factor of 1:2.
Her most recent HbA1C is 6.9%.
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Bolus & Basal InsulinP
las
ma
Insu
lin le
ve
ls
Hours
regular 6-8 hours
NPH 12–18 hours
lispro/aspart 3–5 hours
BASAL INSULIN
detemir ~ 16-24 hours (dose dependant)
glargine ~ 24 hours
Mayfield, JA.. et al, Amer. Fam. Phys.; Aug. 2004, 70(3): 491 Plank, J. et.al. Diabetes Care, May 2005; 28(5): 1107-12
BOLUS INSULIN
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Insulin delivery systems
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Recommended injection sites
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Insulin RegimensJulie is using multiple daily injections
(MDI).
1.What is this concept?
2.How does using 2 different types of insulin help manage her diabetes?
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MDI-Multiple Daily InjectionsMeal Time Insulin : Rapid acting insulin
(Novorapid or Humalog) pre-meals/snacks
Basal Insulin : (Levimir or Lantus) OD or BID
We are trying to replicate a normal pancreatic response
Long acting (BASAL) background insulin (basal) to keep blood sugars between meals in 4-7 range
Rapid (BOLUS) acting insulin to allow for uptake of meal time glucose associatecd with CHO loads
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Expected insulin changes during the day Expected insulin changes during the day for individuals with a healthy pancreas.for individuals with a healthy pancreas.
Basal-Bolus ApproachBasal-Bolus Approach
*Insulin effect images are theoretical representations and are not derived from clinical trial data.
therapy addresses:
Bolus needs: Lispro, Aspart Basal needs: Glargine, Detemir , NPH
Meal Meal Meal
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Diabetes Control and Complications Trial-DCCT
MDI vs Conventional Diabetes Therapy
Decreased average blood glucose8.6 mmol/L vs 12.8 mmol/L
Decreased HbA1c: 7.1% vs 8.9%
Microvascular complications:76% reduction in retinopathy60% reduction in neuropathy56% reduction in nephropathy
DCCT, New England Journal of Medicine, 1993
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Carbohydrate Counting
What is carbohydrate counting and how is it used in the management of diabetes?
What is a correction factor and how is it used?
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Carbohydrate Counting
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If Julie’s CHO ratio is 1:10, how much rapid-acting insulin should she take with her lunch?
60g CHO / 10 units insulin = 6 units of rapid-acting insulin
Carbohydrate Counting
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Correction Factor
In order to calculate the person’s correction factor:= 100/Total Daily Dose (TDD) = # mmol/ unit of insulin
The correction factor represents what 1 unit of insulin is expected to lower the BG by in mmol/L.
Example:TDD is 35 units the correction factor
= 100 ÷ 35 units
= 2.8 mmol/L/per unit of insulin.
Therefore 1 unit of insulin is expected to lower the
BG by 2.8 mmol/L.
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Correction Factor-ExampleIf BG is 13 and the target glucose was 6
13 mmol/L-6mmol/L = 7mmol/L
7 mmol/L ÷ 2.8mmol/L/unit (correction factor) = 2.5 units
The use of this formula must always be re-evaluated in the context of how it works. Patients are encouraged to always review the pattern of their glucose levels to determine if correction factors or boluses are working appropriately.
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What is Glycemic Index?Not all carbohydrate foods
are created equal
The glycemic index (GI) describes this difference by ranking carbohydrates according to their effect on our blood glucose levels.
Low GI carbs produce only small fluctuations in blood glucose.
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Lifestyle ModificationWhat recommendations would
you give Julie in regards to diet and exercise?
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Exercise and Type 1 DiabetesModerate to high levels of physical activity is
associated with substantial reduction in morbidity and mortality in both men and women with type 1 and type 2 diabetes.
In type 1 diabetes, there is little or no endogenous insulin secretion and no physiological regulation of insulin levels.
If exogenous insulin and/or carbohydrate ingestion is not adjusted, hypoglycemia often occurs .
Fear of hypoglycemia may be a barrier to exercise in people with type 1 diabetes
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Exercise and Type 1 DiabetesHypoglycemia may be prevented by
Increasing CHO intake Reducing meal time insulin prior to exerciseAltering basal insulin for insulin pump usersPerforming resistance exercise immediately prior to
aerobic exercise
Exercise performed late in the day or in the evening can be associated with increased risk of overnight hypoglycemia.
Hyperglycemia can occur after very intense exercise and usually associated with high intensity sports/activities/resistance training.
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Diet1. Counseling by a registered dietitian : Eating Well with
Canada’s Food Guide in order
2. Type 1 diabetes:- teach how to match insulin to CHO intake- maintain regularity in timing and spacing of meals-low glycemic index foods
3. Sucrose and sucrose-containing foods can be substituted for other CHOs as part of mixed meals up to a maximum of 10% of total daily energy, provided adequate control of BG and lipids is maintained.
5. Adults: no more than 7% of total daily energy from saturated fats and should limit intake of trans fatty acid.
6. T1DM: informed of delayed hypoglycemia resulting from alcohol consumed with or after the previous evening’s meal.
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Driving GuidelinesJulie is beginning to drive.
What advice should be given to people with diabetes in regards to glucose monitoring and driving?
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Driving GuidelinesMeasure BG level immediately before and at
least every 4 hours (more often in cases of hypoglycemia unawareness) during long drives.
Always carry BG monitoring equipment and supplies of rapidly absorbable carbohydrate within easy reach (e.g. attached to the visor).
Should not drive when their BG level is below <4 mmol/L; treat and only drive if BG >5 mmol/L.FIVE TO DRIVE
Stop and treat as soon as hypoglycemia and/or impaired driving is suspected.
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TYPE 2 DIABETES MELLITUS
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Case:
Marie, is a 58-year-old t woman with a BMI 34 kg/m2
woman who has had type 2 diabetes mellitus for the last 8
years presented saying: “My blood sugars are constantly high.”
At diagnosis 8 year ago:polyuria, polydipsia, and weight lossA1c 8.4%prescribed metformin 500 mg BID
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Clinical Course. . .Gradually rising hemoglobin A1c values – now
11.2%
Tried to increase the dose of Metformin, limited by diarrhea and upset stomach
Tried sitagliptin → nausea, headache and GI upset, discontinued
Gliclazide MR 30 OD started and then gradually increased to 120 mg OD
Compliant with her medications, trying to exercise (walking) and watching her diet
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Pharmacologic Management of
Type 2 diabetes
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Acarbose-Mechanism of ActionInhibits intestinal enzyme alpha-glucosidase and pancreatic enzyme alpha-amylase reduces digestion of carbohydrates and less glucose absorption
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Alpha-Glucosidase inhibitorsEg Acarbose (Glucobay)
A1c lowering 0.6%
Not recommended as initial therapy in patients with marked hyperglycemia (i.e. A1c > 8.5% )
Hypoglycemia rarely occurs
Weight neutral
GI side effects –flatulence, diarrhea, bloating
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Metformin-Mechanism of Action
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BiguanidesBenefitsA1c lowering 1.0-1.5%
Low risk of hypoglycemia
Weight neutral as monotherapy and less weight gain in combination therapy
Improved cardiovascular risk factors
Risks:Contraindicated in renal failure (eGFR<30 ml/min) and hepatic failure (increases risk of lactic acidosis)
May be associated with B12 deficiency
GI side effects- cramping, bloating, diarrhea*
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TZD-Mechanism of Action
Enhances insulin sensitivity in peripheral tissues and liver by activation of ppar-gamma receptors
Eg. Pioglitazone or Rosiglitazone
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ThiazolidinedionesBenefits:Longer duration of monotherapy compared with metformin or glyburide Mild BP loweringA1c lowering 0.8%Low risk of hypoglycemia
Risks:Weight gainIncreased peripheral edema/heart failure (contraindicated in CHF)Increased risk of macular edema (rare)Increased risk of fracturesPossible increased risk of MI with Rosiglitazone.Possible increased risk of bladder cancer with pioglitazone
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Secretagogues-Mechanism of Action
• Sulfonylureas bind to SU receptor inhibiting an efflux of K.• This leads to depolarization and opening of Ca channels.• Influx of Ca triggers exocytosis and release of insulin
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Secretagogues
SulfonylureasGlyburideGlimeperideGliclazide
MeglitinidesRepaglinide
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SulfonylureasBenefitsA1c lowering 0.8%
Rapid glucose lowering
RisksMay cause hypoglycemia
(Glyburide>Glimeperide>Gliclazide)
Associated with weight gain
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MeglitinidesBenefits:A1c lowering 0.7%
Rapid glucose lowering
Shorter half-life leading to less hypoglycemia (can be held if not eating)
Targets post-prandial hypoglycemia better than sulfonylureas
Safe to use in renal impairment
Risks:Weight gain
Risk of hypoglycemia (mild to moderate and less than Gliclazide)
Moderate Cost (more than Gliclazide less than DPP-IV inhibitor)
Recent concerns regarding possible interactions with clopidrogrel (Plavix)
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Incretins Incretins hormones are secreted
in the gut but lead to increase insulin secretion from the pancreas
The incretin concept was developed when it was observed that there is substantially more insulin secreted in response to oral glucose versus intravenous glucose.
Two main incretin hormones: GLP-1 (glucagon like peptide-1) GIP (glucose-dependent
insulinotropic peptide)
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GLP-1 Agonist Mechanism of Action
Activates incretin pathway through a DPP-IV resistant GLP-1 analogue
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GLP-1 Agonists (liraglutide, exenatide)
Benefits:A1c lowering 1.0%
Significant weight loss
Low risk of hypoglycemia
Risks:GI side effects-nausea, cramping, bloating (usually resolve within 2-3 weeks)
Subcutaneous injection
Rare cases of pancreatitis
Increased risk of parafollicular hyperplasia (contra-indicated in patients with a family history of MTC/MEN2)
Costly
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DPP-IV Inhibitors
Amplifies Incretin pathway activation by inhibiting breakdown of endogenous GLP-1 and GIP
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DPP-IV Inhibitors A1c lowering 0.7%
Low risk of hypoglycemia as monotherapy
Weight neutral
Improves post-prandial control
Rare cases of pancreatitis
GI Side effects-nausea, bloating, decreased appetite
Costly
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SGLT-2 Inhibitors Mechanism of Action
SGLT2 inhibitors block glucose transport in the proximal renal tubule leading to urinary excretion of glucose
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SGLT2-inhibitorsEg Canagliflozin, DapagliflozinA1c lowering 0.7-1.0%Hypoglycemia negligibleAssociated with weight lossIncreased glycosuria may lead to increased risk of
urinary tract infections and yeast infectionsOsmotic diuresis may cause hypotensionCases of ketoacidosis in patients with normal blood
glucoseNeeds further investigation
Effect on CV outcomes? Increased HDL/LDL/Costly
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Renal Impairment and diabetes therapy
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Things to consider when deciding best treatmentEvidence to support the use of this
treatment in this population?
Can they afford it?
Is it covered?
Are there any contraindications?
Medication interactions?
Desired effect comparable to research?
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Management of Type 2 Diabetes
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Back to case: What is the current situation?
What is the next step in management of this patient’s diabetes?
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Why insulin?Diabetes is a progressive disease characterized
by decreasing beta-cell function over time.
Studies have shown that glycemic control steadily deteriorates over time, and most patients eventually require insulin therapy for the control of their hyperglycemia.
Some studies indicate that loss of beta-cell function occurs early in the disease and early intervention with insulin may not only stabilize but also even spare beta-cell function.
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When should you consider insulin?
Suboptimal control with max doses of oral agents
At diagnosis if marked hyperglycemia (A1c >9.0)
Temporarily - during illness, pregnancy, stress, procedure/surgery, glucocorticoids
*No evidence that exogenous insulin accelerates the risk of complications of diabetes, and its appropriate use should be encouraged
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What insulin regimen is appropriate?
A common initial approach:for patients on maximized doses of oral agents
add bedtime basal insulin.
Patients presenting with extreme hyperglycemia need a more intensive insulin:Basal-bolus regimen (Multiple Daily injections-
MDI)To be maximally effective carbohydrate
counting and frequent blood glucose monitoring
Premixed insulinFewer injections and glucose monitoring but less flexible Should eat consistent amounts of CHOs at consistent times
of the day
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Diet and Physical Activity
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Benefits of activityIncluding increased
cardiorespiratory fitnessIncreased vigourImproved glycemic controlDecreased insulin
resistanceImproved lipid profileBlood pressure reduction Weight loss
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Exercise Definitions
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CDA Guidelines exercise
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Diet
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Questions ?