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Difficulty: MediumReduction of Risk Potential

A critical care nurse is evaluating a 68-year-old client who is 4 hours post-operative following an open abdominal aortic aneurysm (AAA) repair. The client has a continuous intravenous infusion, an indwelling urinary catheter, and a nasogastric tube to low wall suction. Which clinical findings should the nurse identify as indicators of impending physiological decompensation that require immediate intervention? Select all that apply.

  1. Urine output of 30 mL total recorded over the past two hoursAnswer
  2. B
    Arterial blood gas (ABG) revealing a pH of 7.39, PaCO2 of 41 mmHg, and HCO3 of 24 mEq/L
  3. Lower extremities that are cool to the touch with pedal pulses absent by DopplerAnswer
  4. Heart rate increasing gradually from 82 to 118 beats per minute with a narrowing pulse pressureAnswer
  5. E
    Hypoactive bowel sounds auscultated across all four abdominal quadrants

Answer

The correct findings indicating decompensation are a urine output of 30 mL over two hours, cool lower extremities with absent pedal pulses, and a rising heart rate with a narrowing pulse pressure.
Following an open AAA repair, the most critical risks are hemorrhage and graft occlusion. A urine output of less than 30 mL/hr (30 mL over two hours = 15 mL/hr) indicates severely compromised renal perfusion, potentially due to occlusion above the renal arteries or systemic hypovolemia. Tachycardia with a narrowing pulse pressure is the body's early compensatory response to active internal bleeding and hypovolemic shock. Furthermore, cool extremities with absent pedal pulses indicate an acute lack of peripheral blood flow, strongly suggesting an arterial graft occlusion that requires immediate surgical evaluation.

Step-by-Step Solution

1
Identify the surgical procedure and the timeframe.
The client is in the early post-operative phase (4 hours) following an open abdominal aortic aneurysm (AAA) repair.
This establishes the client's high risk for life-threatening complications, specifically hemorrhage, graft occlusion, and acute renal failure.
2
Evaluate the clinical findings for signs of graft occlusion or ischemia.
A urine output of 15 mL/hr (30 mL over two hours) and absent pedal pulses by Doppler are identified as abnormal.
Urine output less than 30 mL/hr indicates renal hypoperfusion, while absent pedal pulses indicate acute peripheral graft occlusion.
3
Assess the vital signs for indicators of hemodynamic instability.
The heart rate has increased to 118 bpm alongside a narrowing pulse pressure.
These are key early indicators of compensatory hemorrhagic shock, requiring immediate volume resuscitation or surgical return.
4
Differentiate critical complications from expected post-operative findings.
The ABG values are identified as normal, and hypoactive bowel sounds are identified as an expected post-surgical finding.
Recognizing normal baseline data prevents unnecessary interventions and focuses the nurse's attention on true physiological decompensation.

Key Concept

Early recognition of hemorrhage, renal ischemia, and graft occlusion following major vascular surgery.
Estimated Time:1m 30s
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Reduction of Risk Potential

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