Notes
Slide Show
Outline
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Making the Most
of Continuous Glucose Monitoring
  • What Information Is Available?
  • How to Use Immediate Data?
  • How to Use Intermediate Data?
  • What Can Be Learned from Retrospective Analysis?
  • Optimizing CGM System Performance
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MiniMed Paradigm® &
Guardian® REAL-Time CGM Systems
  • On-Screen Reports
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"CareLink"
  • CareLink™ Personal:
  • Online Reports
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DexCom™ 7 STS®
  • On-Screen Reports
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DexCom™ 7 STS®
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DexCom™ 7 STS®
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Freestyle Navigator™
  • On-Screen Reports
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Practical Benefits of Real-Time CGM
  • Rumble strips (avoid serious extremes)
  • Peace of mind
  • Basal & bolus fine tuning
  • Postprandial analysis
  • Insulin action curve determination
  • Short-term Forecasting
  • Learning tool & immediate feedback
  • Eliminates some blood glucose checks???
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How to Look at the Information
  • Immediate
  • Intermediate
  • Retrospective
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Immediate Info: Alerts
  • Alert the user of glucose levels that have crossed specified thresholds, either high or low
  • Visual cues on-screen
  • Vibrations, audible tones
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Setting Alerts
  • Individualize settings
  • Alarm thresholds are not BG targets
  • Balance need for alerts against “nuisance factor”
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Alert Settings
Recommendation
  • LOW: 80 mg/dl
  • (90+ if hypo unaware)
  • HIGH: 240 mg/dL
  • (lower progressively toward 180)
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Special Alert Settings
  • Young children (higher, wider range)
  • Hypoglycemia unawareness (higher)
  • Pregnancy (lower, narrower range)
  • HbA1c of 11.0% (higher initially)
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Immediate Info:
Real-Time Adjustments
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Immediate Info:
Real-Time Adjustments
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Immediate Info:
Potential Bolus Adjustment
Based on BG Direction
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Immediate Info:
Hypoglycemia Alerts
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Intermediate Info:
Use of 2/3/4 Hr Trend Graphs
  • Effects of different food types
  • Effectiveness of bolus amt.
  • Reveals postprandial spikes
  • Pramlintide/Exenatide Influence
  • Exercise effects
  • Impact of Stress
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Intermediate Info:
Use of 9 / 12 / 24 Hr Trend Graphs
  • Facilitates decision-making for basal insulin doses
  • Shows delayed effects of exercise, stress, high-fat foods
  • Reveals overnight patterns
  • Lets user know when bolus action is complete
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Specific Insights to Derive
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Case Study 1:
Effectiveness of Current Program
  • Type 1 diabetes; using insulin glargine & MDI
  • Overnight readings are OK; HbA1c levels are elevated
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Case Study 2a:
Basal Insulin Regulation
  • Rising 2 AM – 8 AM
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Case Study 2b:
Basal Insulin Regulation
  • Type 1 diabetes; using insulin glargine & MDI
  • History of morning lows
  • Now not “covering” highs at night
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Case Study 3:
Detection of Silent Hypoglycemia
  • Type1 diabetes; on pump
  • Frequent fasting highs (9 AM)
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Case Study 4:
Determination of Insulin Action Curve
  • 3-Hour
     Duration
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Case Study 5:
Fine-Tuning Meal Boluses
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Case Study 6:
Fine-Tuning Correction Boluses
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Case Study 7:
Postprandial Analysis
  • Pre-meal BG levels are usually in target range
  • HbA1c are higher than expected based on SMBG
  • Tired and lethargic after meals
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Case Study 8:
Impact of Physical Activity
  • Type 1 diabetes; pump user
  • Basal rates confirmed overnight
  • Exercises in the evening (9 PM)
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Case Study 9:
Impact of Stress
  • Type 1 diabetes; pump user
  • 40 years old; athletic
  • Handsome, excellent speaker
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Case Study 10:
Impact of Various Food Types
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Optimal Calibration
  • Calibrate at times when blood glucose (BG) is stable (fasting, pre-meals)
  • Avoid calibrations during times of rapid glucose change
    • Post meal
    • UP or DOWN arrows are displayed
    • In the period following a correction with food or insulin
    • During exercise

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Optimal Calibration
  • Calibrate before bedtime to avoid alarms during the night
  • Use good technique when performing BG checks for calibration
    • Proper coding
    • Clean hands
  • USE FINGERSTICKS
  • Enter the calibration immediately after the fingerstick (Dexcom, Medtronic systems)
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Sensor Sites
  • Site Selection
    • “Fleshy” areas
    • At least 3” Away from insulin infusion
    • Avoid tight clothing areas, scars, bruises, lipoatrophy
    • Rotate sites
  • Bleeding/Irritation
    • Slight bleeding OK
    • Profuse bleeding: remove
    • Remove introducer needle at proper angle
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Sensor Sites
  • Adhesive
    • Completely cover the Transmitter & Sensor (Navigator & Medtronic systems)
    • Check sensor daily for loose tape
    • Apply extra tape over sensor & transmitter if tape patch begins to “curl” around edges
  • Site Irritation
    • Watch for redness, swelling, tenderness
    • Remove sensor with prolonged irritation (>1 hour)
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Signal Reception
  • Heed transmitter ranges
    • Medtronic: 6 ft.
    • Dexcom: 5 ft.
    • Navigator: 10 ft.
  • Signals do not travel well through water
    • Wear receiver on same side of body as sensor
  • Keep receiver very close while charging (Dexcom)
  • Charge transmitter fully every 6 days (Medtronic)
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Ingredients For Success
  • Wear the CGM at least 90% of the time
  • Look at the monitor 10-20 times per day
  • Do not over-react to the data
  • Adjust your therapy based on trends/patterns
  • Take IOB into account when using CGM values
  • Minimize “nuisance” alarms
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Think Like A Pancreas!