A 45-year-old male with type 1 diabetes mellitus arrives at the emergency department with complaints of excessive thirst, frequent urination, nausea, and confusion. On examination, he appears dehydrated, with Kussmaul breathing (deep, rapid respirations) and fruity breath odour. Which electrolyte imbalance is most commonly associated with acute diabetic ketoacidosis (DKA)?

1. A

   Hyperkalemia

2. B

   Hypokalemia

3. C

   Hypernatremia

4. D

   Metabolic alkalosis

Appeared in: NORCET-7 Mains-2024

Explanation

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• In DKA, the body produces excess ketone bodies, leading to metabolic acidosis.
• To buffer the acid, hydrogen ions (H+) move from the blood into the cells.
• To maintain electrical balance, potassium ions (K+) shift out of the cells and into the bloodstream, causing serum hyperkalemia.
• This initial hyperkalemia occurs despite a significant total body potassium deficit caused by urinary losses from osmotic diuresis.
• Insulin deficiency further contributes by preventing potassium from moving into cells.

Why Other Options Were Wrong

• Option B: This is a major risk during DKA treatment, not typically at initial presentation. Insulin therapy drives potassium back into cells, rapidly lowering serum levels.
• Option C: DKA usually presents with hyponatremia (low sodium). The high blood glucose pulls water out of cells, diluting the sodium in the bloodstream (a condition known as pseudohyponatremia).
• Option D: DKA is the hallmark of severe metabolic acidosis, caused by the accumulation of acidic ketone bodies (ketoacids).

Related Visual

• Visual 1: Diagram: Cellular shift of ions in DKA, showing H+ ions entering the cell and K+ ions exiting into the bloodstream to maintain electrical neutrality.
• Visual 2: ECG Strips: A comparison showing the tall, peaked T-waves characteristic of hyperkalemia versus the flattened T-waves and prominent U-waves seen in hypokalemia.
• Visual 3: Flowchart: Pathophysiology of DKA, illustrating how insulin deficiency leads to hyperglycemia, ketosis, acidosis, and subsequent electrolyte imbalances.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Electrolyte Imbalances in Diabetic Ketoacidosis (DKA) as background academic context rather than a clinical decision trigger.
• A nurse's primary responsibility in DKA management is vigilant monitoring of potassium levels. Checking potassium before starting insulin is a critical patient safety step.
• Continuous cardiac monitoring is essential to detect signs of life-threatening arrhythmias caused by rapid shifts in potassium during treatment.
• What if? If a patient with DKA presents with an initial potassium level of less than 3.3 mEq/L (hypokalemia), insulin therapy must be delayed. The priority is to administer potassium replacement first, as insulin would worsen the hypokalemia and could trigger a fatal arrhythmia.

How to Approach the Question

• Identify the clinical presentation: The combination of hyperglycemia symptoms (thirst, polyuria) with Kussmaul breathing and a fruity breath odour strongly indicates Diabetic Ketoacidosis (DKA).
• Recall the core acid-base disturbance in DKA: It is a metabolic acidosis.
• Analyze the effect of acidosis on electrolytes: Acidosis causes a shift of potassium from inside the cells to the outside (bloodstream) as the body buffers excess hydrogen ions.
• Consider the effect of insulin deficiency: Lack of insulin also prevents potassium from entering cells, further raising blood levels.
• Conclude the initial serum finding: The initial serum potassium is typically normal or high (hyperkalemia), even though the body's total potassium is low due to urinary losses.
• Evaluate the options: This makes Hyperkalemia the correct answer for the initial presentation. Hypokalemia is a risk of treatment, and Metabolic Alkalosis is the opposite of what occurs.

Concept Tested & Keywords

• Concept Tested: Electrolyte Imbalances in Diabetic Ketoacidosis (DKA)
• Stem keywords: type 1 diabetes mellitus, diabetic ketoacidosis (DKA), Kussmaul breathing, fruity breath odour, electrolyte imbalance
• Lead-in keywords: most commonly associated with
• Clinical cues: Kussmaul breathing (deep, rapid respirations) is a compensatory mechanism for metabolic acidosis.
• Clinical cues: Fruity breath odour is caused by the exhalation of acetone, a type of ketone body.

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