Podcast #310: Bicarb in DKA

Podcast #310: Bicarb in DKA

Author: Gretchen Hinson, M.D.

Educational Pearls:

  • Controversial topic.
  • Pathophysiology - acidosis leads to an extracellular potassium shift. Patients in DKA will be intracellularly potassium deplete, but will have a falsely normal/elevated serum potassium.
  • 3 risk of giving bicarb in DKA - alkalosis will drive potassium intracellularly but can overshoot (hypokalemia) and increase risk of arrhythmias; bicarb slows clearance of ketones and will transiently increase their precursors; bicarb can cause elevated CSF acidosis.
  • 3 instances when appropriate to give bicarb in DKA: DKA in arrest; hyperkalemic in DKA with arrhythmia; fluid and vasopressor refractory hypotension.


References:

Bratton, S. L., & Krane, E. J. (1992). Diabetic Ketoacidosis: Pathophysiology, Management and Complications. Journal of Intensive Care Medicine, 7(4), 199-211. doi:10.1177/088506669200700407

Chua, H., Schneider, A., & Bellomo, R. (2011). Bicarbonate in diabetic ketoacidosis - a systematic review. Annals of Intensive Care, 1(1), 23. doi:10.1186/2110-5820-1-23

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