Which condition is characterized by severe dehydration, electrolyte imbalances, and potentially life-threatening metabolic acidosis?

• A. Hyperkalemia
• B. Hypoglycemia
• C. Lactic acidosis
• D. Diabetic ketoacidosis

Answer: (D)

The scenario describes diabetic ketoacidosis, which happens when there is an insulin deficiency with counter-regulatory hormone excess. This leads to high blood glucose and rapid breakdown of fat into ketones, causing a high anion gap metabolic acidosis. The severe dehydration comes from osmotic diuresis driven by the hyperglycemia, which also causes electrolyte losses. Patients often have total body potassium depletion even if initial labs show a high or normal potassium level, and sodium can appear low due to hyperglycemia. The combination of marked dehydration, electrolyte disturbances, and a life-threatening metabolic acidosis from accumulated ketones is characteristic of DKA.

Hyperkalemia can occur early in DKA but this choice doesn’t capture the full syndrome of dehydration with metabolic acidosis. Hypoglycemia is a different state with low glucose and doesn’t typically present with such dehydration and acidosis. Lactic acidosis involves acid buildup from lactate, usually related to hypoperfusion or sepsis, rather than the ketone-driven acidosis and osmotic diuresis seen in DKA.