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Difficulty: MediumPhysiological Adaptation

A nurse is caring for a client who underwent a partial bowel resection 12 hours ago. The client's baseline vital signs were temperature 37.0°C (98.6°F), heart rate 78 beats/min, respiratory rate 14 breaths/min, and blood pressure 124/76 mm Hg. Which of the following new assessment findings should the nurse identify as the earliest indicator that the client is developing hypovolemic shock?

  1. A heart rate of 116 beats/min and a blood pressure of 110/90 mm HgAnswer
  2. B
    A systolic blood pressure of 86 mm Hg accompanied by cold, mottled skin
  3. C
    An arterial blood gas revealing a pH of 7.47, PaCO2 of 31 mm Hg, and HCO3- of 23 mEq/L
  4. D
    Hypoactive bowel sounds auscultated uniformly across all four abdominal quadrants

Answer

The earliest indicator of developing hypovolemic shock is a heart rate of 116 beats/min and a blood pressure of 110/90 mm Hg.
In the early (compensatory) stage of hypovolemic shock, the body's sympathetic nervous system initiates a compensatory response to decreased intravascular volume. This results in an increased heart rate (tachycardia) to maintain cardiac output and peripheral vasoconstriction to maintain systemic vascular resistance. This vasoconstriction disproportionately elevates the diastolic blood pressure, creating a narrowed pulse pressure (typically a difference of less than 30 mm Hg between systolic and diastolic values).

Step-by-Step Solution

1
Analyze the client's baseline vital signs and current postoperative timeline.
The client is 12 hours post-abdominal surgery with normal baseline hemodynamics, placing them at risk for active internal hemorrhage.
Establishing the baseline and surgical context identifies the primary physiological risks.
2
Differentiate between early (compensatory) and late (progressive) signs of hypovolemic shock.
Early shock presents with tachycardia and a narrowing pulse pressure due to vasoconstriction. Late shock presents with profound hypotension and poor perfusion (mottled skin).
The question specifically asks for the earliest indicator of decompensation.
3
Evaluate the remaining distractors against expected postoperative findings.
Mild respiratory alkalosis and hypoactive bowel sounds are expected physiological responses to surgical pain and abdominal manipulation.
Expected findings do not indicate an acute physiological deterioration requiring emergency intervention.

Key Concept

Early Physiological Adaptation to Volume Loss (Compensatory Shock)
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Topics

Physiological Adaptation

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