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Dexcom Decoded: What Every Nurse Needs to Know About CGMs
Podcast Notes
Traditional fingersticks = snapshots
CGMs (like Dexcom) = continuous data (288 readings/day)
Shift from reactive → proactive nursing care
📍 Where CGMs Measure
Sensor sits in interstitial fluid (NOT blood)
Glucose moves: blood → interstitial fluid → cells
⏱️ Creates a 5–15 minute lag behind blood glucose
👉 Clinical Impact:
During rapid changes, CGM ≠ real-time blood sugar
⚙️ Dexcom G6 vs G7 (Bedside Relevance)
G6:
2-piece system
⏳ 2-hour warm-up (NO data)
G7:
All-in-one, smaller
⚡ 30-minute warm-up
⏰ 12-hour grace period after expiration
👉 Nursing takeaway: Always use fingersticks during warm-up
⚠️ The Somogyi Effect (High-Yield!)
Overnight hypoglycemia → body releases stress hormones
Liver dumps glucose → morning hyperglycemia
🚨 Danger:
Treating the morning high with more insulin can → severe hypoglycemia next night
👉 CGM reveals:
Overnight crash 📉
Rebound spike 📈
📊 Trend Arrows = Clinical Gold
Not just the number—look at direction & speed
Examples:
90 → steady (→) = stable → routine care
90 → dropping fast (↓) = impending hypoglycemia 🚨
👉 Action changes based on trend, not just value
🔮 Predictive Alerts
“Urgent Low Soon” alert (G7)
Warns up to 20 minutes before severe hypoglycemia (<55)
👉 Enables early intervention (juice, glucose, etc.) BEFORE crash
🚫 When NOT to Trust the CGM
Symptoms ≠ reading
Rapid glucose changes
Patient looks hypoglycemic but CGM reads normal
👉 Golden Rule:
Treat the patient, not the screen
✔️ Always confirm with fingerstick if mismatch
🏥 Real Bedside Application
Use CGM trends during:
Insulin administration
Meal timing
Overnight monitoring
Prevent:
Insulin overdosing
Missed hypoglycemia
Dangerous assumptions
🎯 Big Takeaways
CGMs provide the full glucose story, not just moments
Trend arrows > single numbers
CGMs improve time in range + patient outcomes
Technology supports—but NEVER replaces—clinical judgment
Want to reach out? Send an email to [email protected] or visit SuperNurse.ai
The content presented in The Super Nurse Podcast is for educational purposes only and should not be considered medical advice. The host and creators are not responsible for any clinical decisions made based on this content. Always adhere to your institution’s policies and consult appropriate healthcare professionals when making patient care decisions.
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By Brooke WallacePodcast Notes
Traditional fingersticks = snapshots
CGMs (like Dexcom) = continuous data (288 readings/day)
Shift from reactive → proactive nursing care
📍 Where CGMs Measure
Sensor sits in interstitial fluid (NOT blood)
Glucose moves: blood → interstitial fluid → cells
⏱️ Creates a 5–15 minute lag behind blood glucose
👉 Clinical Impact:
During rapid changes, CGM ≠ real-time blood sugar
⚙️ Dexcom G6 vs G7 (Bedside Relevance)
G6:
2-piece system
⏳ 2-hour warm-up (NO data)
G7:
All-in-one, smaller
⚡ 30-minute warm-up
⏰ 12-hour grace period after expiration
👉 Nursing takeaway: Always use fingersticks during warm-up
⚠️ The Somogyi Effect (High-Yield!)
Overnight hypoglycemia → body releases stress hormones
Liver dumps glucose → morning hyperglycemia
🚨 Danger:
Treating the morning high with more insulin can → severe hypoglycemia next night
👉 CGM reveals:
Overnight crash 📉
Rebound spike 📈
📊 Trend Arrows = Clinical Gold
Not just the number—look at direction & speed
Examples:
90 → steady (→) = stable → routine care
90 → dropping fast (↓) = impending hypoglycemia 🚨
👉 Action changes based on trend, not just value
🔮 Predictive Alerts
“Urgent Low Soon” alert (G7)
Warns up to 20 minutes before severe hypoglycemia (<55)
👉 Enables early intervention (juice, glucose, etc.) BEFORE crash
🚫 When NOT to Trust the CGM
Symptoms ≠ reading
Rapid glucose changes
Patient looks hypoglycemic but CGM reads normal
👉 Golden Rule:
Treat the patient, not the screen
✔️ Always confirm with fingerstick if mismatch
🏥 Real Bedside Application
Use CGM trends during:
Insulin administration
Meal timing
Overnight monitoring
Prevent:
Insulin overdosing
Missed hypoglycemia
Dangerous assumptions
🎯 Big Takeaways
CGMs provide the full glucose story, not just moments
Trend arrows > single numbers
CGMs improve time in range + patient outcomes
Technology supports—but NEVER replaces—clinical judgment
Want to reach out? Send an email to [email protected] or visit SuperNurse.ai
The content presented in The Super Nurse Podcast is for educational purposes only and should not be considered medical advice. The host and creators are not responsible for any clinical decisions made based on this content. Always adhere to your institution’s policies and consult appropriate healthcare professionals when making patient care decisions.