What is the emergency department management for a 24‑year‑old woman with type 1 diabetes who missed insulin doses and presents with diabetic ketoacidosis (hyperglycemia, ketonemia, metabolic acidosis, Kussmaul respirations, tachycardia, hypotension, dehydration)?

Emergency Department Management of DKA in a 24-Year-Old Woman

This patient requires immediate aggressive IV fluid resuscitation, continuous IV insulin infusion (without an initial bolus), potassium replacement, and close monitoring for complications—this is severe DKA with pH 7.15, requiring ICU-level care.

Initial Resuscitation & Stabilization

Fluid Replacement (First Priority)

• Start aggressive IV fluid resuscitation immediately with 0.9% normal saline
• Initial bolus: 15-20 mL/kg over the first hour (approximately 1-1.5 L for this patient)
• Continue at 250-500 mL/hour, adjusting based on hemodynamic status, urine output, and hydration markers
• This patient shows severe dehydration (delayed capillary refill, slow turgor, hypotension, tachycardia) requiring aggressive repletion 1

Critical pitfall: Inadequate fluid resuscitation is a common error—dehydration correction is as important as insulin therapy and must be addressed first.

Insulin Therapy (Second Priority)

Do NOT give an initial insulin bolus in this patient. The evidence shows:

• Start continuous IV regular insulin infusion at 0.1 units/kg/hour (approximately 2.4 units/hour for a 60 kg patient) 1
• Target glucose decline of 50-75 mg/dL per hour
• If glucose doesn't fall by 50 mg/dL in the first hour, verify adequate hydration first, then double the insulin infusion rate hourly until achieving target decline 1

When glucose reaches 250 mg/dL (14 mmol/L):

• Add dextrose to IV fluids (D5W or D5 0.45% NS)
• Continue insulin infusion to clear ketones—ketonemia takes longer to resolve than hyperglycemia 1
• Do not stop insulin until ketones clear and acidosis resolves

Potassium Replacement (Critical)

This patient has high potassium initially, but this is deceptive:

• Total body potassium is depleted despite elevated serum levels
• As insulin therapy begins and acidosis corrects, potassium will shift intracellularly, causing dangerous hypokalemia
• Once potassium falls below 5.3 mEq/L, add 20-40 mEq potassium to each liter of IV fluid 1
• Use 2/3 KCl and 1/3 KPO4 for balanced replacement
• Monitor potassium every 2-4 hours

Critical pitfall: Failure to anticipate and prevent hypokalemia during treatment can cause life-threatening cardiac arrhythmias.

Monitoring Protocol

Laboratory Monitoring

• Every 2-4 hours: electrolytes, glucose, BUN, creatinine, venous pH, anion gap 1
• Repeat arterial blood gases are unnecessary—venous pH adequately monitors acidosis resolution 1
• Monitor for resolution criteria continuously

Ketone Monitoring

• Direct measurement of beta-hydroxybutyrate is preferred over nitroprusside methods 1
• Nitroprusside (standard urine/serum ketone tests) only measures acetoacetate and acetone, not beta-hydroxybutyrate (the predominant ketone)
• During treatment, beta-hydroxybutyrate converts to acetoacetate, which may falsely suggest worsening ketosis—do not use nitroprusside methods to guide therapy 1

Bicarbonate Therapy

With pH 7.15, bicarbonate therapy may be considered but is not mandatory:

• Bicarbonate may be beneficial when pH <6.9 1
• Not necessary if pH ≥7.0 1
• At pH 7.15, this falls in a gray zone—prioritize aggressive fluid and insulin therapy first
• If used, give cautiously to avoid paradoxical CNS acidosis

Resolution Criteria

DKA is resolved when ALL of the following are met 1:

• Glucose <200 mg/dL (11 mmol/L)
• Serum bicarbonate ≥18 mEq/L
• Venous pH ≥7.3

Transition to Subcutaneous Insulin

Critical pitfall to avoid: Premature discontinuation of IV insulin causes rebound hyperglycemia and ketosis 2.

When DKA resolves and patient can eat:

• Start subcutaneous basal-bolus insulin regimen
• Continue IV insulin for 1-2 hours after first subcutaneous dose to ensure adequate overlap 1
• This prevents the dangerous gap between stopping IV insulin and achieving therapeutic subcutaneous levels

Additional Considerations for This Patient

Anemia Management

• Hb 8 g/dL with low MCV suggests iron deficiency anemia, likely from chronic menorrhagia
• Address after DKA stabilization
• May contribute to fatigue and exercise intolerance

Precipitating Factors

• Poor insulin compliance is the clear precipitant 2
• Address barriers to adherence during hospitalization
• Arrange close diabetes education and follow-up

Disposition

• This patient requires ICU admission given severe DKA (pH 7.15), hemodynamic instability, and altered mental status
• Extended ED management may be necessary if ICU beds unavailable, but requires experienced monitoring 3

The standardized approach using IV fluids, continuous insulin infusion without bolus, aggressive potassium replacement, and careful monitoring will reduce mortality and prevent complications in this life-threatening presentation 1, 2.