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Difficulty: MediumPhysiological Adaptation

A nurse is monitoring a client who has experienced profuse fluid loss from severe acute gastroenteritis. Which of the following vital sign trends provides the earliest clinical evidence that the client is entering the compensatory stage of hypovolemic shock?

  1. A blood pressure reading that shifts from 126/74 mm Hg to 116/90 mm HgAnswer
  2. B
    A blood pressure reading that drops from 134/82 mm Hg to 108/58 mm Hg
  3. C
    A heart rate that decreases from 104 beats/min to 88 beats/min
  4. D
    A respiratory rate that remains consistent at 14 breaths/min

Answer

A blood pressure reading that shifts from 126/74 mm Hg to 116/90 mm Hg
In the compensatory stage of hypovolemic shock, the sympathetic nervous system triggers peripheral vasoconstriction to maintain cardiac output and tissue perfusion. This physiological adaptation raises the diastolic blood pressure. Simultaneously, a declining stroke volume causes the systolic pressure to drop or remain stable. The result is a narrowed pulse pressure (the difference between systolic and diastolic values), which is one of the earliest and most reliable indicators of developing shock.

Step-by-Step Solution

1
Identify the client's primary risk factor based on the scenario.
The client has experienced profuse fluid loss, placing them at high risk for hypovolemic shock.
Recognizing the mechanism of injury or illness helps anticipate the body's physiological response.
2
Recall the physiological mechanisms of the compensatory stage of shock.
The sympathetic nervous system releases epinephrine and norepinephrine, causing peripheral vasoconstriction to maintain organ perfusion.
Understanding the hormonal and vascular changes is necessary to interpret vital sign trends accurately.
3
Evaluate how sympathetic compensation affects specific blood pressure parameters.
Vasoconstriction increases systemic vascular resistance, which raises diastolic blood pressure. Meanwhile, decreased stroke volume lowers systolic blood pressure, resulting in a narrowed pulse pressure.
Narrowing pulse pressure is one of the earliest measurable hemodynamic changes before profound hypotension occurs.
4
Analyze the provided options against the physiological expectation.
The shift from 126/74 (pulse pressure of 52) to 116/90 (pulse pressure of 26) represents a significantly narrowed pulse pressure, indicating early compensation.
Overt hypotension or a decreasing heart rate do not reflect the earliest compensatory mechanisms of hypovolemic shock.

Key Concept

Narrowing pulse pressure as an early indicator of compensatory shock
Estimated Time:1m 15s
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Topics

Physiological Adaptation

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