Clinical features of DKA, except?

Appeared in: SGPGI Nursing Officer-2023

Explanation

Diabetic Ketoacidosis (DKA) is a severe metabolic acidosis.
The body's primary respiratory compensation for metabolic acidosis is Kussmaul breathing, which is a pattern of deep, rapid, and labored respirations.
This compensatory hyperventilation is an attempt to exhale excess carbon dioxide (CO₂) to raise the blood pH.
Therefore, 'Breathing normal' is not a clinical feature of DKA; the breathing pattern is characteristically abnormal.

Option A: An elevated anion gap is a hallmark of DKA. It is caused by the accumulation of unmeasured acidic ketone bodies in the blood.
Option B: Significant hyperglycemia, often in the 300-500 mg/dL range or higher, is a core diagnostic criterion for DKA due to insulin deficiency.
Option C: A decreased bicarbonate level (typically less than 18 mEq/L) is a defining feature of the metabolic acidosis in DKA, as bicarbonate is consumed while buffering the ketoacids.

Clinical Relevance

Nursing practice connection: Knowing Clinical manifestations of Diabetic Ketoacidosis (DKA) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Recognizing Kussmaul respirations is a critical nursing assessment skill. It is a visible sign of severe metabolic acidosis and a medical emergency that requires immediate intervention.
In a patient with known diabetes presenting with rapid breathing, a nurse should immediately check blood glucose and suspect DKA.
The management of DKA is a nursing-intensive process involving frequent monitoring of vital signs, neurological status, blood glucose, electrolytes, and fluid balance.

How to Approach the Question

First, identify the core concept: the clinical signs of Diabetic Ketoacidosis (DKA).
Note the keyword 'except'. This means you are looking for the option that is NOT a feature of DKA.
Evaluate each option against your knowledge of DKA's pathophysiology.
Recall that DKA involves Hyperglycemia, Ketosis, and Acidosis.
Option A (Anion gap): Acidosis from ketones causes a high anion gap. This is a feature.
Option B (High glucose): Hyperglycemia is a defining feature. This is a feature.

Concept Tested & Keywords

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E6 Medicine Davidson Principles Practice 24e p. 756-758

E6 Medicine Harrison 22e Part 2 p. 1121-1123

E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 1 (pp 26-370 of 370) p. 199-201

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