Management of Diabetic Ketoacidosis

Definition and Classification

• Diabetic ketoacidosis (DKA) is defined as blood glucose >250 mg/dL, arterial pH <7.3, serum bicarbonate <15 mEq/L, and moderate ketonemia or ketonuria, according to the American Diabetes Association 1, 2, 3, 4
• The severity of DKA can be classified using the following criteria:

Risk Factors and Presentation

• Risk factors for DKA include infection, discontinuation or inadequate insulin, new-onset type 1 diabetes, medications affecting carbohydrate metabolism, acute medical events, psychological stress, eating disorders, and emotional stress, as reported by the American Diabetes Association 1, 2, 5, 4
• DKA presents with symptoms including polyuria, polydipsia, polyphagia, weight loss, vomiting, abdominal pain, dehydration, weakness, clouding of sensoria, and in severe cases, coma, as stated by the American Diabetes Association 4

Fluid Resuscitation

• Initial treatment includes infusing isotonic saline (0.9% NaCl) at 15-20 ml/kg/h to expand intravascular volume and restore renal perfusion, as recommended by the American Diabetes Association 5
• In patients with both DKA and CHF exacerbation, fluid resuscitation should be more conservative with initial isotonic saline at 10-15 ml/kg/h and frequent cardiac monitoring to prevent volume overload while ensuring adequate renal perfusion, as recommended by the American Diabetes Association and the American Heart Association 5, 6
• Target initial volume expansion of 500-1000 mL in adults, rather than 1-1.5L, to avoid volume overload 5
• Limit total fluid administration to 50-75% of calculated deficit in first 24 hours to prevent worsening heart failure 6
• Consider limiting total fluid intake to around 2 L/day to minimize the risk of volume overload 6
• Avoid rapid fluid administration which can precipitate or worsen heart failure 6
• Don't withhold necessary fluids completely, as inadequate resuscitation can worsen renal function and delay DKA resolution 7
• Avoid hypotonic solutions which can worsen cerebral edema risk 7

Insulin Therapy

• Initial IV insulin therapy should exclude hypokalemia and involve an IV bolus of regular insulin at 0.15 U/kg body weight, followed by a continuous infusion at 0.1 U/kg/h (approximately 5-7 U/h in adults) 5
• The American Diabetes Association recommends targeting glucose between 150-200 mg/dL for mild and moderate/severe DKA, and between 200-250 mg/dL for HHS until resolution 8
• When glucose falls below 200-250 mg/dL, dextrose should be added to IV fluids while continuing insulin infusion 8
• After DKA resolution, a subcutaneous multi-dose insulin plan should be initiated, with IV insulin infusion continued for 1-2 hours after the first subcutaneous dose to prevent rebound hyperglycemia 8

Potassium Replacement

• Potassium replacement should be initiated with 20-30 mEq/L potassium (2/3 KCl and 1/3 KPO₄) added to IV fluids, with careful consideration to avoid hypokalemia (K⁺ <3.3 mEq/L) 5
• The American Diabetes Association recommends adding potassium to IV fluids once serum levels fall below 5.5 mEq/L and adequate urine output is confirmed, with a standard replacement of 20-30 mEq potassium per liter of IV fluid (2/3 KCl and 1/3 KPO₄) 5

Bicarbonate Therapy

• Bicarbonate therapy is recommended in DKA only when arterial pH is below 6.9, with evidence graded as "B" level, and should not be administered when pH is 7.0 or higher 5

Special Populations

• For pediatric patients (≤20 years), the American Diabetes Association recommends using 1.5 times the 24-hour maintenance requirement (approximately 5 ml/kg/hr) for fluid administration, with potassium in solution being 1/3 KPO₄ and 2/3 KCl or K-acetate, and more cautious fluid administration due to higher risk of cerebral edema 5
• Pregnant patients may present with euglycemic diabetic ketoacidosis, requiring immediate attention due to risk of feto-maternal harm, as recommended by the American Diabetes Association 4, 9
• Patients with cardiovascular disease require cardiac monitoring during treatment, according to the American Heart Association 10

Monitoring and Resolution

• Hourly monitoring should include vital signs, neurological status, blood glucose, and fluid input/output, with every 2-4 hours monitoring of electrolytes, BUN, creatinine, and venous pH, with a strength of evidence based on expert consensus 2
• DKA is considered resolved when blood glucose <200 mg/dL, serum bicarbonate ≥18 mEq/L, venous pH >7.3, and anion gap normalized (<12 mEq/L), according to the American Diabetes Association 5, 2, 1, 3

Discharge Planning and Education

• The American Diabetes Association recommends ensuring proper discharge planning with education on DKA prevention and management, and scheduling outpatient follow-up within 1 month of discharge (or within 1-2 weeks if glycemic management medications were changed) 8
• Provide education on diabetes self-management, glucose monitoring, when to seek medical attention, sick-day management, and proper medication administration, as recommended by the American Diabetes Association, with high evidence supporting the importance of patient education in diabetes management 11, 1, 12, 13, 14