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Methodology to Interpret CGM Data
9402339-011
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Objective
Understand an easy to follow methodology for interpreting CGM tracings (the continuous blood glucose measurements)
Key Points
1-2-3 Methodology:
•Breaks down review of CGM tracings into manageable parts
•Analyze cause and effect of blood glucose changes throughout a patient’s day
•Provide therapy recommendations to improve a patient’s blood glucose control and diabetes management
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1-2-3 Methodology
Three Steps to Analyze CGM Reports:
• Step 1: Look at the overnight period first
• Step 2: Look at pre-prandial levels
• Step 3: Look at post-prandial levels
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Step 1: Look at the Overnight Period
Definition of Overnight Period• Night time period no longer
influenced by the last evening meal / snack
• True fasting period is usually midnight to 6 a.m.
Identify fasting values that are hypo and hyper• Anything below target range is hypo• Anything above target range is hyper• Target ranges are individually set
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First: Look for Hypo•For glucose levels BELOW low limit
– Problem: basal rate is probably too high– Solution: decrease basal rate?
Second: Look for Hyper•For glucose levels ABOVE high limit
– Problem: basal rate is probably too low– Solution: increase basal rate?
Step 1: Look at the Overnight Period
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Definition: Period just before asnack or meal• What is seen before a meal?
– Previous bolus (active insulin) – Previous meal residual – Post-meal activities
Identify glucose values that are hypoand hyper• Find the cause-effect relationship of
previous meal / bolus / activity• Look at breakfast, then lunch, then
dinner
Step 2: Look at Pre-prandial Periods
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First: Look for HypoConsider:• Influence of bolus, previous meal,
active insulin • Exercise and activity• Food: Timing, Quantity, Composition
Second: Look for HyperConsider:• Same considerations as hypo• Plus breakfast related dawn phenomenon
Step 2: Look at Pre-prandial Periods
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Definition: 3-hour period following food intake Peak values should be lower than 135-180 mg/dl (7.5 – 10.0 mmol/l)• What is seen after a meal?
– That meal’s bolus (active insulin) – Previous meal residual – Post-meal activities
Identify glucose values that are hypo and hyper• Find the cause-effect relationship
of previous meal / bolus / activity• Look at breakfast, then lunch, then dinner (and major snacks)
Step 3: Look at Post-prandial Periods
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First: Look for Hypo• If hypoglycemia is observed in the
PP period (2–3 hours after meal):– Suggests issue with the bolus for that meal – Consider timing, type, accuracy of bolus – Consider influence of exercise
Second: Look for Hyper• If Hyperglycemia peaks above 180 mg/dl
(<10.0mmol/l) post meal:– Consider timing, type, accuracy of bolus– Consider food intake, food quantity and meal composition
Step 3: Look at Post-prandial Periods
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Use Sensor Summary Report in Addition to the Tracings
Other Reports
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• Monitor recorded over 860 readings• Average glucose sensor reading 170 mg/dL• However, range is 40 – 330 mg/dL
Day 2Day 1 TotalsDay 3Day 2Day 1 TotalsDay 3
# of Sensor Values 286 286 288# of Sensor Values 286 286 288 860
Average (mg/dL) 140 155 165 170Average (mg/dL) 140 155 165 170
Min – Max (mg/dL) 30 - 240 70 - 240 40 - 330 40 – 330Min – Max (mg/dL) 30 - 240 70 - 240 40 - 330 40 – 330
Sensor Summary Report
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60%11%
29%Hyperglycemia > 140/mg/dl/min
Hypoglycemia< 70mg/dl/min
Target Range:70 to 140 mg/dl/min
Percentage of Time in High, Low and Target Range
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Dawn Phenomenon
FridaySaturdaySunday
FridaySaturdaySunday
Nocturnal Hypoglycemia
Modal Day Summary Report: Case Study
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Postprandial Hyperglycemia
Nocturnal Hypoglycemia
Modal Day Summary Report: Case Study
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Medtronic Diabetes18000 Devonshire StreetNorthridge, CA 91325www.medtronicdiabetes.com 1-800-646-4633