Which of the following electrolytes are most critical in this patient?

A 10-year-old boy is brought to the emergency department after his parents noted that he was acting confused and lethargic following several bouts of nausea and vomiting. Upon arrival the patient is tachycardic and is breathing deeply and slowly. Laboratory studies are remarkable for a serum pH of 7.21, a serum glucose level of 700 mg/dL, a serum bicarbonate level of 16 mEq/L, and a serum anion gap of 22 (normal: 7-16). Intravenous fluids and insulin are administered. Measurement and management of which of the following electrolytes are most critical in this patient?

(A) Bicarbonate
(B) Calcium
© Chloride
(D) Potassium
(E) Sodium