Immediate Management of Vomiting in Type 1 Diabetes
A patient with type 1 diabetes presenting with vomiting requires immediate assessment for diabetic ketoacidosis (DKA), as vomiting accompanied by ketosis represents a life-threatening emergency requiring urgent medical intervention. 1, 2
Immediate Assessment (First 15 Minutes)
Check for DKA immediately - this is the critical first step that determines all subsequent management:
- Measure blood glucose and ketones (blood or urine) right now - vomiting with ketosis may indicate DKA, which requires immediate medical care to prevent death 1, 2
- Assess mental status and hydration - altered consciousness or signs of dehydration (dry mouth, decreased urination, dizziness) mandate immediate hospitalization 2, 3
- Obtain laboratory tests: complete metabolic panel, serum ketones, urinalysis, and arterial blood gases if DKA is suspected 2, 3
Critical Management Principles
Never Stop Insulin
Continue insulin therapy under all circumstances - this is the most important rule in type 1 diabetes during illness:
- Never discontinue basal insulin, even if the patient cannot eat - stopping insulin precipitates DKA 2, 4, 3, 5
- The stress of illness aggravates glycemic control and often requires supplemental insulin doses despite vomiting 1, 2
- Increase blood glucose monitoring to every 4-6 hours during acute illness 1, 2
Fluid and Carbohydrate Replacement
Ensure adequate fluid intake to prevent dehydration, which worsens hyperglycemia:
- Provide sodium-containing replacement fluids such as broth, tomato juice, or sports drinks 2
- Target 150-200g carbohydrate daily (45-50g every 3-4 hours) using liquid or soft foods like sugar-sweetened drinks, juices, or soups to prevent starvation ketosis 2
- If the patient cannot maintain oral intake, prompt medical evaluation and possible hospitalization is necessary 2
When to Hospitalize Immediately
Seek emergency medical care for any of the following:
- Vomiting preventing oral intake of fluids and medications 2
- Blood glucose >300 mg/dL over 2 consecutive days 2
- Moderate to large ketones present on testing 2
- Signs of DKA: abdominal pain, fruity breath odor, rapid breathing, altered mental status 2, 5
- Severe dehydration or inability to maintain fluid intake 1, 2
Hospital Management (If DKA Confirmed)
If DKA is diagnosed (glucose typically elevated, pH <7.3, bicarbonate <18 mEq/L, ketones present):
- Begin isotonic saline at 15-20 mL/kg/hour for the first hour 3
- Start continuous IV regular insulin at 0.1 U/kg/hour after confirming potassium >3.3 mEq/L 3
- Add dextrose to IV fluids from the beginning of insulin therapy to prevent hypoglycemia while clearing ketones 3
- Replace potassium (20-40 mEq/L) once renal function confirmed and potassium <5.5 mEq/L, as total body potassium is depleted despite potentially normal initial levels 3
- Continue IV insulin until ketones clear completely, even if glucose normalizes - this typically requires maintaining glucose 100-180 mg/dL with dextrose-containing fluids 3
Special Consideration: Euglycemic DKA
Be aware that DKA can occur with glucose <200 mg/dL (euglycemic DKA), particularly in patients who have maintained some carbohydrate intake during illness:
- The metabolic acidosis and ketosis are still present and life-threatening despite "normal" glucose 3
- Check ketones even if glucose is not severely elevated in any vomiting type 1 diabetic 3
- Management requires simultaneous dextrose and insulin from the start 3
Common Pitfalls to Avoid
- Discontinuing insulin during illness - this is the most dangerous error and precipitates DKA 2, 4
- Failing to check ketones - vomiting without ketone testing misses the diagnosis of DKA 1, 2
- Inadequate fluid replacement - dehydration worsens hyperglycemia and increases mortality 2, 4
- Assuming normal glucose excludes DKA - euglycemic DKA is a real entity requiring the same urgent treatment 3
- Stopping IV insulin before ketones clear - premature discontinuation causes DKA recurrence 3