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Difficulty: MediumPhysiological Adaptation

A 24-year-old client with type 1 diabetes mellitus is brought to the emergency department after a 2-day history of vomiting and omitting insulin doses. The triage nurse suspects diabetic ketoacidosis (DKA). Which of the following clinical findings should the nurse expect to assess? Select all that apply.

  1. Deep, rapid respirationsAnswer
  2. Arterial pH of 7.287.28 and PaCO2PaCO_2 of 2828 mm HgAnswer
  3. C
    Serum bicarbonate (HCO3−HCO_3^-) level of 2626 mEq/L
  4. D
    Bounding radial pulses and a heart rate of 5858 beats/min
  5. Orthostatic hypotension and poor skin turgorAnswer

Answer

The expected clinical findings are deep and rapid respirations, an acidic pH with a low PaCO2PaCO_2 due to compensation, and signs of significant fluid volume deficit such as orthostatic hypotension and poor skin turgor.
The client is experiencing diabetic ketoacidosis (DKA), characterized by hyperglycemia, ketosis, and metabolic acidosis. The lack of insulin forces the body to break down fats, producing acidic ketones. This state of metabolic acidosis triggers a physiological adaptation: compensatory Kussmaul respirations (deep, rapid breathing) to blow off excess CO2CO_2, which subsequently lowers the PaCO2PaCO_2 while the overall pH remains acidic. Additionally, extreme hyperglycemia causes osmotic diuresis, leading to a profound fluid volume deficit that presents clinically as orthostatic hypotension, poor skin turgor, tachycardia, and weak pulses.

Step-by-Step Solution

1
Analyze the client's presentation and underlying pathophysiology.
A client with type 1 diabetes who has omitted insulin and is vomiting will experience absolute insulin deficiency, resulting in severe hyperglycemia and accelerated lipolysis (fat breakdown).
Identifying the primary pathophysiological trigger is required to predict subsequent systemic adaptations.
2
Evaluate the metabolic and acid-base consequences.
Fat breakdown produces ketones, causing metabolic acidosis characterized by a low pH and low HCO3−HCO_3^-. The respiratory system adapts by initiating Kussmaul respirations to decrease PaCO2PaCO_2.
DKA directly disrupts acid-base balance; recognizing compensatory respiratory mechanisms helps identify accurate assessment findings.
3
Evaluate the fluid and electrolyte consequences.
Severe hyperglycemia induces massive osmotic diuresis. This leads to profound dehydration and hypovolemia, resulting in tachycardia, orthostatic hypotension, and poor skin turgor.
Understanding fluid shifts is critical for differentiating expected compensatory signs of early hypovolemic shock from incorrect vital sign trends.

Key Concept

Diabetic Ketoacidosis Pathophysiology and Systemic Compensatory Mechanisms
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Topics

Physiological Adaptation

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