Metabolic Acidosis Management

Classification and Severity Assessment

The American Diabetes Association defines moderate DKA as pH <7.2 with bicarbonate <10 mmol/L, while mild DKA is characterized by pH ≥7.3 and bicarbonate ≥15 mmol/L 1
A patient with pH 7.25 and bicarbonate 17 mmol/L suggests either mild-to-moderate DKA or mixed metabolic acidosis from renal impairment plus another process 1

DKA is characterized by hyperglycemia, metabolic acidosis, and ketone accumulation, with severity classification showing mild-to-moderate acidosis 1, 5
The American Diabetes Association recommends checking plasma glucose and serum/urine ketones immediately to diagnose DKA 5

Essential laboratory tests include plasma glucose, serum and urine ketones, complete metabolic panel, arterial blood gas, serum osmolality, and medication review 2, 5

The American Diabetes Association recommends fluid resuscitation with isotonic saline at 15-20 mL/kg/h during the first hour to restore intravascular volume and renal perfusion 4
Insulin therapy should be started immediately if glucose >250 mg/dL with positive ketones, with primary treatments for DKA being insulin therapy and fluid resuscitation, not bicarbonate 2, 4
Bicarbonate therapy is not indicated at pH 7.25, with the American Diabetes Association recommending bicarbonate therapy only when pH falls below 6.9-7.0 2, 4

Monitor venous blood gas every 2-4 hours to track pH and anion gap resolution, and serum potassium frequently to avoid life-threatening hypokalemia 2, 4
Adjust fluid therapy by switching to 0.45% NaCl at 4-14 mL/kg/h if corrected sodium is normal or elevated, and add dextrose to fluids once glucose reaches 250 mg/dL 2, 4

If creatinine remains elevated after volume resuscitation, target bicarbonate ≥22 mmol/L once acute phase resolves, and consider oral sodium bicarbonate supplementation for chronic management 3, 4
KDIGO guidelines recommend continuous renal replacement therapy with bicarbonate-based dialysate for intractable acidosis with renal failure 3

If DKA, mortality is 1-3% overall, higher with severe acidosis, and prevention requires patient education about sick-day management and early contact with healthcare providers 1, 2
If chronic kidney disease, maintain bicarbonate ≥22 mmol/L to prevent protein catabolism, bone disease, and CKD progression, requiring monthly monitoring and oral sodium bicarbonate supplementation 3, 4