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Difficulty: Very hardPhysiological Adaptation

A nurse is monitoring a client who sustained a closed femur fracture and pelvic contusions following a motor vehicle collision. Serial assessments over a three-hour period reveal the following trends:

Parameter14:0015:0016:00
Blood Pressure124/72 mm Hg118/78 mm Hg110/86 mm Hg
Heart Rate76 beats/min88 beats/min104 beats/min
Respiratory Rate14 breaths/min18 breaths/min24 breaths/min
Hourly Urine Output55 mL40 mL25 mL
Neurological StatusAlert and orientedAlert, appropriately anxiousRestless and agitated

Based on the physiological mechanisms underlying these assessment trends, which action should the nurse prioritize?

  1. Ensure the patency of large-bore intravenous access and verify the availability of crossmatched blood.Answer
  2. B
    Anticipate a prescription for a continuous vasoactive infusion to prevent further decline in arterial pressure.
  3. C
    Administer a prescribed anxiolytic medication to mitigate the client's increasing agitation and tachycardia.
  4. D
    Elevate the head of the bed to a high-Fowler's position to maximize diaphragmatic excursion and oxygenation.

Answer

Ensure the patency of large-bore intravenous access and verify the availability of crossmatched blood.
The client is exhibiting classic signs of the compensatory stage of hypovolemic (hemorrhagic) shock due to internal bleeding from the femur and pelvic fractures. The sympathetic nervous system responds to volume loss by inducing peripheral vasoconstriction, which raises the diastolic pressure and narrows the pulse pressure (from 52 mm Hg to 24 mm Hg). This vasoconstriction temporarily maintains the mean arterial pressure (MAP). However, the rising heart rate, increasing respiratory rate, dropping urine output (due to renal conservation of water), and new-onset restlessness (indicating mild cerebral hypoxia) confirm inadequate tissue perfusion. The priority action is to prepare for immediate intravascular volume expansion with crystalloids and blood products to prevent progression to decompensated, irreversible shock.

Step-by-Step Solution

1
Analyze the blood pressure trend to identify the pulse pressure and mean arterial pressure (MAP).
The pulse pressure narrows significantly from 52 mm Hg (124-72) to 24 mm Hg (110-86). The MAP remains relatively stable (around 89 to 94 mm Hg).
A narrowing pulse pressure with a maintained MAP is a hallmark sign of compensatory vasoconstriction in early shock.
2
Correlate the blood pressure findings with the heart rate, respiratory rate, and urine output.
Mild tachycardia (104 beats/min), tachypnea (24 breaths/min), and oliguria (25 mL/hr) are present.
The sympathetic nervous system increases the heart and respiratory rates while the kidneys conserve fluid (via aldosterone and ADH release) to maintain cardiac output.
3
Evaluate the change in neurological status within the context of the physical trauma.
The transition from alert to restless/agitated indicates decreasing cerebral perfusion.
Femur and pelvic fractures can conceal massive internal hemorrhage. The clinical picture confirms the compensatory stage of hypovolemic shock.
4
Determine the priority nursing intervention for compensatory hemorrhagic shock.
The priority is rapid restoration of circulating volume.
Large-bore intravenous access and blood products are essential to treat the underlying hemorrhage before the client decompensates into irreversible shock.

Key Concept

Recognition of early (compensatory) hemorrhagic shock through subtle vital sign trends, specifically a narrowing pulse pressure, despite a seemingly normal mean arterial pressure.
Estimated Time:2m 0s
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Topics

Physiological Adaptation

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