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Difficulty: MediumPhysiological Adaptation

A nurse is evaluating the condition of a client admitted to the intensive care unit with severe diabetic ketoacidosis (DKA). The client is lethargic and exhibiting deep, rapid respirations. Based on the client's clinical presentation, which of the following arterial blood gas (ABG) values are consistent with the expected acid-base imbalance and physiological compensation? Select all that apply.

  1. pH 7.28Answer
  2. PaCO2PaCO_2 26 mm HgAnswer
  3. HCO3−HCO_3^- 12 mEq/LAnswer
  4. D
    PaCO2PaCO_2 48 mm Hg
  5. E
    pH 7.48

Answer

The expected ABG values for a client with DKA experiencing respiratory compensation include a decreased pH (such as 7.28), a decreased HCO3−HCO_3^- (such as 12 mEq/L), and a decreased PaCO2PaCO_2 (such as 26 mm Hg).
DKA results in the systemic accumulation of ketones, leading to a primary metabolic acidosis (characterized by a low pH and a low HCO3−HCO_3^-). The body's natural physiological response is to increase the rate and depth of breathing (Kussmaul respirations) to excrete volatile acids in the form of carbon dioxide (CO2CO_2) and normalize the pH. Therefore, the expected ABG results demonstrate a low pH, a low HCO3−HCO_3^-, and a compensatory low PaCO2PaCO_2.

Step-by-Step Solution

1
Identify the primary acid-base imbalance associated with DKA.
Diabetic ketoacidosis produces excess systemic ketoacids, leading to metabolic acidosis characterized by a low pH and a depleted HCO3−HCO_3^- level.
Understanding the underlying pathophysiology determines the primary laboratory abnormalities.
2
Determine the body's compensatory mechanism for metabolic acidosis.
The respiratory system compensates by increasing the rate and depth of breathing (Kussmaul respirations) to exhale more carbon dioxide, thereby lowering the PaCO2PaCO_2.
Compensation aims to return the blood pH toward a normal physiological range by manipulating the opposite acid-base component.
3
Evaluate the provided ABG values against the expected pathophysiological changes.
A pH of 7.28, HCO3−HCO_3^- of 12 mEq/L, and PaCO2PaCO_2 of 26 mm Hg accurately reflect partially compensated metabolic acidosis.
Matching the clinical findings to the ABG values confirms accurate interpretation of the client's status.

Key Concept

Partially compensated metabolic acidosis in Diabetic Ketoacidosis (DKA)
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Topics

Physiological Adaptation

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