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Difficulty: HardPhysiological Adaptation

A nurse is evaluating a client who is 4 hours post-operative following an open cholecystectomy. The client is receiving continuous intravenous fluids and pain management via a morphine patient-controlled analgesia (PCA) pump. Which of the following assessment findings indicate the client is experiencing an acute physiological deterioration requiring immediate intervention? Select all that apply.

  1. A narrowing pulse pressure with a current blood pressure of 100/82 mm HgAnswer
  2. A cumulative urine output of 25 mL over the past two hoursAnswer
  3. An arterial blood gas analysis showing a pH of 7.27, a PaCO2 of 60 mm Hg, and an HCO3 of 24 mEq/LAnswer
  4. D
    An arterial blood gas analysis showing a pH of 7.37, a PaCO2 of 42 mm Hg, and an HCO3 of 25 mEq/L
  5. E
    Hypoactive bowel sounds auscultated in all four abdominal quadrants
  6. F
    A heart rate that has decreased from 92 to 74 beats per minute while the client is dozing

Answer

The findings requiring immediate intervention are a narrowing pulse pressure (100/82 mm Hg), a cumulative urine output of 25 mL over two hours, and an arterial blood gas showing uncompensated respiratory acidosis (pH 7.27, PaCO2 60 mm Hg).
The correct findings all represent acute, life-threatening physiological deterioration. A narrowing pulse pressure and severe oliguria (<30 mL/hr) are classic early indicators of compensatory hypovolemic or hemorrhagic shock, demanding rapid fluid resuscitation or surgical intervention. An ABG with a pH of 7.27 and PaCO2 of 60 mm Hg demonstrates acute uncompensated respiratory acidosis, directly resulting from hypoventilation caused by the morphine PCA pump, necessitating immediate airway management.

Step-by-Step Solution

1
Analyze the client's postoperative context and current therapies.
The client had abdominal surgery (risk for bleeding/fluid shifts) and is on a morphine PCA (risk for respiratory depression).
Identifying the client's specific risks guides the interpretation of assessment data.
2
Evaluate the vital signs and urine output for indications of shock.
The pulse pressure of 18 mm Hg (100 - 82) is critically narrow. The urine output of 12.5 mL/hr is well below the minimum 30 mL/hr threshold.
Narrowing pulse pressure and oliguria are early compensatory signs of hypovolemic or hemorrhagic shock resulting from decreased cardiac output.
3
Interpret the arterial blood gas (ABG) results.
A pH of 7.27 (acidemia) and PaCO2 of 60 mm Hg (hypercapnia) with normal HCO3 indicate acute, uncompensated respiratory acidosis.
This confirms opioid-induced respiratory depression from the PCA pump, a life-threatening emergency.
4
Differentiate expected postoperative findings from acute deterioration.
Hypoactive bowel sounds, normal ABG values (pH 7.37), and a resting heart rate of 74 bpm are expected or stable findings.
Prioritization requires distinguishing between normal recovery processes and physiological decline.

Key Concept

Early recognition of hypovolemic shock (narrowing pulse pressure, oliguria) and respiratory depression (respiratory acidosis) in the postoperative period is critical for preventing irreversible physiological compromise.
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Topics

Physiological Adaptation

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