if ap pt comes on dks say rbs 410, acetone ppsitive i give 10 u regular insulin iv stat then 50 units over 50 units ns at 6ml per hour till 250 then 20 units insulin in 500ml dns at 100ml per hour till 180 gm/dl, what tod od after that
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DKA management after glucose reaches 250 mg/dl insulin dextrose protocol next steps
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Good - I have enough to give a thorough, practical answer. Here it is:
DKA Management - What to Do After RBS Hits 180 mg/dL
Your protocol so far is solid. Let me walk through the full picture and what comes next.
Your Protocol So Far (Reviewed)
| Phase | What you did | Comment |
|---|---|---|
| Stat | 10 units Regular insulin IV bolus | Correct |
| Phase 1 | 50 units Regular in 50 ml NS at 6 ml/hr (= 6 units/hr) | Standard rate, correct |
| Phase 2 | Switched to 20 units in 500 ml DNS at 100 ml/hr when RBS hit 250 | DNS added to prevent hypoglycemia while insulin continues - correct |
| Now | RBS at 180 mg/dL | Time to transition |
What to Do NOW (RBS 180 mg/dL)
1. Switch Fluids - Stop DNS, Start D5 in NS (or D10W if dropping fast)
- If glucose is still falling fast (>100 mg/dL per hour), consider switching to D10 in NS to slow the drop
- Target: keep RBS between 150-200 mg/dL - do NOT let it go below 150 while acidosis is still present
- The insulin MUST continue - stopping insulin stops ketone clearance, not glucose
2. Reduce Insulin Rate - Do NOT Stop
- Reduce infusion to 0.05 units/kg/hr (roughly 3-4 units/hr for average adult)
- Some protocols titrate based on glucose: keep at minimum 2-3 units/hr
- Never stop the insulin infusion until ketoacidosis is resolved - glucose normalizes before acidosis does
3. Resolution Criteria (when you can STOP IV insulin)
You can stop the insulin drip only when ALL THREE are met:
- Venous pH ≥ 7.3
- Serum bicarbonate ≥ 18 mEq/L
- Anion gap closed/normalizing (AG = Na - (Cl + HCO3), normal <12)
- Plasma/urine ketones clearing (acetone negative/trace)
- Patient can eat orally
4. Transition to Subcutaneous Insulin (CRITICAL STEP)
- Give SC insulin 1-2 hours BEFORE stopping the IV drip - this prevents rebound hyperglycemia from the gap
- If the patient was previously on insulin, restart their usual regimen
- If new diabetic: start with 0.5-0.8 units/kg/day split as basal-bolus (e.g., 50% as basal glargine, 50% as rapid-acting with meals)
- Do NOT abruptly stop IV insulin without SC coverage in place
5. Potassium Replacement (ongoing - very important)
| K+ level | Action |
|---|---|
| < 3.5 mEq/L | Hold insulin, replace K at 40 mEq/hr, recheck |
| 3.5-5.0 mEq/L | Add 20-40 mEq KCl to each litre of fluid |
| > 5.0 mEq/L | No replacement, monitor closely |
Insulin drives K+ into cells and can cause fatal hypokalemia - check K every 2-4 hours.
6. Monitor for Ongoing Acidosis
- Repeat VBG (venous blood gas) every 2-4 hours
- Repeat RBS hourly until stable
- Check urine/serum ketones every 4-6 hours
- Monitor renal function, Na, Cl, phosphate
7. Find and Treat the Precipitating Cause
DKA doesn't happen in a vacuum. Look for:
- Infection (most common) - fever, WBC, urine R/E, CXR, blood cultures
- Missed insulin doses
- New-onset T1DM
- MI/ACS - do ECG, troponin
- Pancreatitis - serum amylase/lipase
- Drugs - steroids, SGLt2 inhibitors (euglycemic DKA)
8. Bicarbonate?
- Only give if pH < 7.0 (some say < 6.9)
- 100 mEq NaHCO3 in 400 ml sterile water over 2 hours
- Routine bicarb is NOT recommended and may worsen cerebral edema and hypokalemia
Quick Summary Checklist for RIGHT NOW
- Reduce insulin drip to ~3-4 units/hr (0.05 units/kg/hr)
- Switch fluid to D5NS or D10NS - keep RBS 150-200
- Check K+ - replace if < 5.0
- Repeat VBG - check pH and bicarbonate
- Keep insulin running until pH ≥ 7.3 + HCO3 ≥ 18 + gap closed
- Give SC insulin 1-2 hrs before stopping drip
- Investigate the trigger (infection, missed dose, etc.)
Remember: In DKA, you are treating the acidosis and ketosis, not just the sugar. Glucose normalizes in 4-6 hours but acidosis can take 12-24 hours. Stopping insulin early because RBS looks good is the most common mistake made.
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