Bicarbonate Therapy in Diabetic Ketoacidosis

Indications for Bicarbonate Therapy

Bicarbonate therapy may be beneficial in adult patients with severe acidemia with pH < 6.9 2
No bicarbonate therapy is required if pH is ≥ 7.0, as insulin therapy alone is sufficient to resolve ketoacidosis 1, 2
For patients with pH between 6.9-7.0, prospective randomized studies have failed to show either beneficial or deleterious changes in morbidity or mortality with bicarbonate therapy 2
In pediatric patients, if pH remains < 7.0 after the initial hour of hydration, it is recommended to administer 1-2 mEq/kg sodium bicarbonate over the course of 1 hour 1

For adult patients with pH 6.9-7.0, administer 50 mmol sodium bicarbonate diluted in 200 ml sterile water and infused at a rate of 200 ml/h 3, 2
For pediatric patients with pH < 7.0 after initial hydration, administer 1-2 mEq/kg sodium bicarbonate over 1 hour 1
When administering bicarbonate, it can be added to NaCl with any required potassium, ensuring the solution does not exceed 155 mEq/L sodium 1

Monitor serum potassium levels closely as both insulin and bicarbonate therapy lower serum potassium 3, 4
Check blood glucose every 2-4 hours and measure serum electrolytes, glucose, blood urea nitrogen, creatinine, osmolality, and venous pH every 2-4 hours 4
Potassium supplementation should be maintained in intravenous fluids and carefully monitored 2

The evidence regarding bicarbonate use in DKA with pH < 6.9 is limited, as no prospective randomized studies have been reported for this severe pH range 2
The American Diabetes Association guidelines assign a grade C (lower rank) to recommendations regarding bicarbonate therapy, indicating evidence from uncontrolled or poorly controlled studies 2