Which of the following clinical conditions are correctly matched with their respective anion gap status?

A) Starvation – Increased anion gap

B) Diabetic ketoacidosis – Increased anion gap

C) Severe vomiting – Increased anion gap

1. A

   Only A is correct

2. B

   A and C are correct

3. C

   A and B are correct

4. D

   Only B is correct

Appeared in: INI-CET EXAM -2025

Explanation

• The question asks to identify which clinical conditions are correctly associated with an increased anion gap.
• Starvation leads to the breakdown of fats and the production of ketoacids, which are unmeasured anions, thus increasing the anion gap.
• Diabetic ketoacidosis (DKA) is a classic cause of high anion gap metabolic acidosis due to the significant accumulation of ketoacids (beta-hydroxybutyrate and acetoacetate).
• Severe vomiting causes a loss of hydrochloric acid, leading to metabolic alkalosis with a normal anion gap, not an increased anion gap acidosis.
• Therefore, the statements that both starvation and diabetic ketoacidosis cause an increased anion gap are correct.

Why Other Options Were Wrong

• Option A: This option is incomplete. While statement A (Starvation) is correct, statement B (Diabetic ketoacidosis) is also a correct cause of an increased anion gap.
• Option B: This option is incorrect because it includes statement C. Severe vomiting causes metabolic alkalosis with a normal anion gap, not an increased anion gap.
• Option D: This option is incomplete. While statement B (Diabetic ketoacidosis) is a very common cause of an increased anion gap, statement A (Starvation) is also correct.

Related Visual

• Visual 1: Flowchart: 'Diagnosing Metabolic Acidosis'. This would show the initial step of calculating the anion gap, then branching into 'High Anion Gap' and 'Normal Anion Gap' with lists of causes for each (e.g., MUDPILES/GOLDMARK for high gap, HARDUP for normal gap).
• Visual 2: Table: 'Causes of High Anion Gap Metabolic Acidosis (HAGMA)'. This table would list conditions like Diabetic Ketoacidosis, Starvation Ketoacidosis, Lactic Acidosis, Renal Failure, and certain poisonings, explaining the specific unmeasured anion for each.

Clinical Relevance

• Nursing practice connection: Knowing Anion Gap in Acid-Base Disorders helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Calculating the anion gap is a critical first step for a nurse in interpreting arterial blood gas (ABG) results, as it helps narrow down the potential causes of metabolic acidosis, guiding further diagnosis and treatment.
• In an emergency setting, a high anion gap in a patient with altered mental status immediately raises suspicion for conditions like DKA or toxic ingestion, prompting rapid blood glucose checks and further specific tests.
• What if the patient had severe diarrhea instead of vomiting? Severe diarrhea causes a loss of bicarbonate-rich fluid from the intestines. This leads to a normal anion gap (hyperchloremic) metabolic acidosis, as the kidneys retain chloride to maintain electrical neutrality.

How to Approach the Question

• First, understand the concept of the anion gap: the difference between measured cations (Na+) and measured anions (Cl- + HCO3-).
• Recall or look up the common causes of a high anion gap. A useful mnemonic is MUDPILES or GOLDMARK.
• Evaluate each statement (A, B, C) individually based on its pathophysiology.
• Statement A (Starvation): Starvation causes the body to produce ketones for energy, which are acids. This adds unmeasured anions, so it causes a high anion gap. This statement is correct.
• Statement B (DKA): DKA involves massive production of ketoacids. This is a classic cause of a high anion gap. This statement is correct.
• Statement C (Vomiting): Vomiting leads to loss of stomach acid (HCl). This causes metabolic alkalosis, not acidosis. The anion gap is typically normal. This statement is incorrect.

Concept Tested & Keywords

• Concept Tested: Anion Gap in Acid-Base Disorders
• Stem keywords: anion gap, Starvation, Diabetic ketoacidosis, Severe vomiting
• Lead-in keywords: correctly matched
• Negative lead-in flag: false

Question ID

QEEgJ1Im5ngqjeikVPRbZq

Copy ID