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Difficulty: HardPhysiological Adaptation

A nurse is caring for a client who is receiving treatment for severe sepsis secondary to a perforated bowel. Upon assessment, the client is restless with cold, clammy skin. Vital signs include a heart rate of 134 beats/min, a blood pressure of 82/46 mm Hg, and a respiratory rate of 36 breaths/min with deep, rapid inspirations. The latest arterial blood gas (ABG) results are: pH 7.23, PaCO2 27 mm Hg, PaO2 84 mm Hg, and HCO3- 12 mEq/L. Based on these findings, which conclusion correctly directs the nurse's immediate priorities?

  1. The deep, rapid breathing is a necessary compensatory mechanism for metabolic acidosis caused by tissue hypoperfusion; the nurse should prioritize improving systemic circulation with prescribed vasopressors or fluid volume.Answer
  2. B
    The client is experiencing primary respiratory alkalosis due to severe hyperventilation; the nurse should prioritize coaching the client to slow their breathing pattern to retain carbon dioxide.
  3. C
    The arterial blood gases indicate a mixed respiratory and metabolic acidosis consistent with impending respiratory failure; the nurse should prioritize preparing for immediate endotracheal intubation.
  4. D
    The client's profound tachycardia and hypotension indicate irreversible cardiogenic shock; the nurse should prioritize obtaining a prescription to restrict further intravenous fluid administration.

Answer

The correct answer accurately identifies the acid-base imbalance as metabolic acidosis with respiratory compensation, recognizing that the priority is to treat the underlying hypoperfusion without suppressing the compensatory breathing.
The client is in septic shock, leading to cellular hypoxia and lactic acid production, which manifests as metabolic acidosis (low pH, low HCO3-). The deep, rapid breathing is a vital physiological adaptation (respiratory compensation) to exhale CO2 and prevent a further drop in pH. The priority is to treat the underlying hypoperfusion to stop lactic acid production, typically by administering prescribed IV fluids or vasopressors to increase the mean arterial pressure.

Step-by-Step Solution

1
Analyze the arterial blood gas (ABG) results.
The pH is 7.23 (acidosis). The HCO3- is 12 mEq/L (primary metabolic acidosis). The PaCO2 is 27 mm Hg (low, indicating partial respiratory compensation).
Systematic ABG interpretation is required to determine the client's primary physiological alteration and compensatory state.
2
Correlate the ABG findings with the client's clinical presentation.
The client has severe sepsis, hypotension (82/46 mm Hg), and tachycardia. These are signs of shock, leading to cellular hypoxia, anaerobic metabolism, and lactic acidosis.
Understanding the etiology of the metabolic acidosis guides appropriate clinical interventions.
3
Evaluate the respiratory pattern.
The respiratory rate of 36 breaths/min with deep, rapid inspirations (Kussmaul respirations) is the body's attempt to blow off CO2 to raise the pH.
Interfering with a vital compensatory mechanism can lead to rapid physiological decompensation.
4
Determine the highest priority nursing action.
The nurse must address the root cause (hypoperfusion) by optimizing hemodynamics with fluids or vasopressors rather than attempting to alter the compensatory respiratory pattern.
In shock states, restoring tissue perfusion is the definitive treatment for resolving lactic acidosis.

Key Concept

In shock states, metabolic acidosis occurs due to lactic acid accumulation from tissue hypoperfusion. The body compensates via hyperventilation (Kussmaul respirations) to decrease PaCO2. Nursing care must focus on restoring perfusion rather than suppressing the compensatory respiratory drive.
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Physiological Adaptation

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