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Difficulty: MediumPhysiological Adaptation

A nurse is caring for a client who is 24 hours postoperative following an open bowel resection. The client has an intravenous line and an indwelling urinary catheter. Which change in the client's assessment provides the earliest physiological indication of a developing shock state?

  1. A narrowing of the pulse pressure with a gradual increase in the resting heart rateAnswer
  2. B
    A sudden decrease in systolic blood pressure below 90 mm Hg accompanied by severe lethargy
  3. C
    An arterial blood gas result showing a pH of 7.39 and a PaCO2 of 41 mm Hg
  4. D
    A new onset of sharp incisional pain that worsens when repositioning

Answer

A narrowing of the pulse pressure with a gradual increase in the resting heart rate
In the early (compensatory) stage of shock, the body's physiological adaptation involves sympathetic nervous system activation. This leads to an increased heart rate to maintain cardiac output and peripheral vasoconstriction to maintain blood pressure. The vasoconstriction typically raises the diastolic blood pressure while the systolic remains relatively stable, resulting in a narrowed pulse pressure. These subtle hemodynamic changes occur before a significant drop in systolic blood pressure.

Step-by-Step Solution

1
Analyze the clinical scenario and the specific requirement of the question.
The nurse must identify the earliest sign of physiological shock in a postoperative client.
Differentiating between early compensation, late decompensation, and expected postoperative findings is critical for timely, life-saving intervention.
2
Evaluate each clinical finding against the stages of shock and expected postoperative parameters.
Mild tachycardia and narrowed pulse pressure reflect early sympathetic compensation. Hypotension is a late sign. The ABG provided is normal. The incisional pain is an expected finding.
Understanding physiological adaptation helps the nurse recognize when compensatory mechanisms are first activated to maintain perfusion.

Key Concept

Early recognition of compensatory shock mechanisms
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Topics

Physiological Adaptation

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