Metabolic Acidosis in Emergency Medicine Treatment & Management

Updated: Oct 10, 2017
  • Author: Antonia Quinn, DO; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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Treatment

Emergency Department Care

The initial therapeutic goal for patients with severe acidemia is to raise the systemic pH above 7.1-7.2, a level at which dysrhythmias become less likely and cardiac contractility and responsiveness to catecholamines will be restored.

Metabolic acidosis can be reversed by treating the underlying condition or by replacing the bicarbonate. The decision to give bicarbonate should be based upon the pathophysiology of the specific acidosis, the clinical state of the patient, and the degree of acidosis. [10]

Treating the underlying conditions in high AG states usually is sufficient in reversing the acidosis. Treatment with bicarbonate is unnecessary, except in extreme cases of acidosis when the pH is less than 7.1-7.2. For all cases of diabetic ketoacidosis, the role of bicarbonate is controversial, regardless of the pH or bicarbonate level.

In hyperchloremic acidosis, the central problem is with the reabsorption or regeneration of bicarbonate. In these conditions, therapy with bicarbonate makes physiologic sense and is prudent in patients with severe acidosis.

Caution with bicarbonate therapy is indicated because of its potential complications, including the following:

  • Volume overload
  • Hypokalemia
  • CNS acidosis
  • Hypercapnia
  • Tissue hypoxia via leftward shift of hemoglobin-oxygen dissociation curve
  • Alkali stimulation of organic acidosis (lactate)
  • Overshoot alkalosis
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Consultations

Metabolic acidosis secondary to ingestions (eg, salicylate, methanol, ethylene glycol) often requires dialysis therapy, and a nephrologist should be consulted early in the case management. Toxicologic consultation should also be considered in such cases. Dialysis is the preferred treatment for patients with significant metabolic acidosis in the setting of renal failure.

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