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Difficulty: HardPhysiological Adaptation

A critical care nurse is monitoring a client admitted with severe acute necrotizing pancreatitis. The client's central venous pressure (CVP) has decreased from 8 mm Hg to 2 mm Hg over the last four hours. Which of the following assessment findings indicate the client is developing hypovolemic shock secondary to massive third-spacing of fluids? Select all that apply.

  1. Narrowing of the arterial pulse pressureAnswer
  2. B
    Arterial blood gas pH of 7.46
  3. Capillary refill time of 5 secondsAnswer
  4. D
    Jugular venous distention with the head of the bed elevated 45 degrees
  5. E
    Warm, flushed skin in the distal extremities
  6. Urine output of 30 mL over the previous 2 hoursAnswer

Answer

The clinical indicators of developing hypovolemic shock in this client are a narrowing of the arterial pulse pressure, a capillary refill time of 5 seconds, and a urine output of 30 mL over the previous 2 hours.
In severe acute pancreatitis, increased capillary permeability leads to a massive shift of intravascular fluid into the third space (retroperitoneal cavity). This fluid loss reduces circulating blood volume, lowering the central venous pressure. As the body enters hypovolemic shock, compensatory mechanisms engage: peripheral vasoconstriction causes a narrowed arterial pulse pressure and a prolonged capillary refill time (> 3 seconds), while decreased renal perfusion leads to oliguria (urine output < 30 mL/hr).

Step-by-Step Solution

1
Analyze the pathophysiology of the condition.
Severe acute pancreatitis causes systemic inflammation and increased capillary permeability, leading to massive fluid shifts from the intravascular space into the retroperitoneal space (third-spacing).
Understanding the fluid shift explains the drop in central venous pressure (CVP) and the development of relative hypovolemia.
2
Identify the expected physiological compensation for hypovolemia.
The body activates the sympathetic nervous system to maintain blood pressure by inducing peripheral vasoconstriction and shunting blood to vital organs.
This compensation directly manifests as specific clinical signs in the patient.
3
Evaluate the options against the signs of hypovolemic shock.
Vasoconstriction causes narrowed pulse pressure and prolonged capillary refill. Decreased renal perfusion causes oliguria. Acidosis, not alkalosis, is expected. Neck veins should be flat, and skin should be cool/clammy.
Matching the expected physiological responses to the options isolates the correct findings.

Key Concept

Hypovolemic Shock and Third-Spacing in Acute Pancreatitis
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Topics

Physiological Adaptation

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