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Difficulty: Very hardPhysiological Adaptation

An intensive care nurse evaluates a mechanically ventilated client 2424 hours post-splenectomy who received a massive transfusion protocol for hemorrhagic shock. Over the last two hours, the client's urine output decreased to 10 mL/hr10\text{ mL/hr}, peak inspiratory pressure (PIP) increased from 24 cm H2O24\text{ cm H}_2\text{O} to 52 cm H2O52\text{ cm H}_2\text{O}, and blood pressure dropped from 118/72 mm Hg118/72\text{ mm Hg} to 82/46 mm Hg82/46\text{ mm Hg}. The current central venous pressure (CVP) is 21 mm Hg21\text{ mm Hg}. Which action should the nurse take first?

  1. A
    Administer a rapid 500 mL500\text{ mL} isotonic crystalloid fluid bolus.
  2. B
    Initiate a prescribed continuous norepinephrine infusion.
  3. Measure intra-abdominal pressure using the indwelling urinary catheter system.Answer
  4. D
    Obtain a stat arterial blood gas and prepare to increase positive end-expiratory pressure.

Answer

Measure intra-abdominal pressure using the indwelling urinary catheter system.
The client's clinical presentation—severe oliguria, drastically elevated peak inspiratory pressures, hypotension, and a high central venous pressure following massive fluid resuscitation—is the hallmark triad of Abdominal Compartment Syndrome (ACS). Fluid resuscitation causes massive third-spacing and bowel edema, raising intra-abdominal pressure. This pressure compresses the renal vasculature (decreasing urine output), compresses the inferior vena cava (decreasing venous return and cardiac output, resulting in hypotension), and displaces the diaphragm upward, which increases intrathoracic pressure (manifesting as elevated PIP and a falsely elevated CVP). The immediate priority is to measure intra-abdominal pressure via the bladder catheter to confirm the diagnosis and prepare for decompression.

Step-by-Step Solution

1
Analyze the client's hemodynamic and respiratory trends.
The client is experiencing severe oliguria, hypotension, drastically elevated PIP, and elevated CVP after massive fluid resuscitation.
Identifying the pattern of multi-system decompensation is required to pinpoint the underlying etiology.
2
Synthesize the pathophysiological findings.
The massive fluid load caused bowel edema (third-spacing), severely increasing intra-abdominal pressure. This pressure compresses the renal arteries (oliguria), compresses the inferior vena cava (reduced venous return leading to hypotension), and pushes the diaphragm upward into the thoracic cavity (high PIP and falsely elevated CVP).
Connecting these specific signs points directly to Abdominal Compartment Syndrome (ACS) leading to obstructive shock.
3
Determine the priority nursing intervention.
The priority is to objectively measure the intra-abdominal pressure (IAP) via the bladder to confirm the diagnosis.
Accurate IAP measurement is essential before targeted medical or surgical decompressive interventions can be initiated.

Key Concept

Pathophysiological recognition of Abdominal Compartment Syndrome (ACS) and secondary obstructive shock.
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Topics

Physiological Adaptation

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