Examkin

Question

Difficulty: Very hardPhysiological Adaptation

A client is recovering 24 hours post-operatively following an emergency repair of a ruptured abdominal aortic aneurysm. Due to significant intraoperative blood loss, the client required massive fluid and blood product resuscitation. The nurse assesses the client and notes a tensely distended abdomen, a sudden decrease in urine output to 12 mL/hr, and increasing peak inspiratory pressures on the mechanical ventilator. Current hemodynamic monitoring reveals a blood pressure of 84/46 mm Hg, a heart rate of 128 beats/min, and a central venous pressure (CVP) of 18 mm Hg. Which of the following is the nurse's MOST appropriate initial action?

  1. Measure the client's intra-abdominal pressure using the indwelling urinary catheter.Answer
  2. B
    Administer a prescribed intravenous loop diuretic to treat the elevated central venous pressure.
  3. C
    Prepare to administer a rapid bolus of isotonic crystalloids to address the systemic hypotension.
  4. D
    Perform immediate endotracheal suctioning to alleviate the high peak inspiratory pressures.

Answer

The nurse should measure the intra-abdominal pressure using the indwelling urinary catheter.
The client's clinical presentation is the classic triad of Abdominal Compartment Syndrome (ACS): a tense abdomen, oliguria, and increased peak airway pressures following massive fluid resuscitation. The severe intra-abdominal edema increases intra-abdominal pressure, which pushes upward against the diaphragm (causing high peak airway pressures) and compresses the vena cava and renal veins (causing decreased venous return, hypotension, tachycardia, and oliguria). The increased intrathoracic pressure falsely elevates the central venous pressure (CVP). The priority initial nursing action is to objectively measure the intra-abdominal pressure, typically done by instilling sterile saline into the bladder via an indwelling catheter and connecting it to a pressure transducer, to confirm the diagnosis.

Step-by-Step Solution

1
Analyze the client's multi-system clinical presentation.
The client has a tense abdomen, oliguria (12 mL/hr), high peak inspiratory pressures, hypotension (84/46 mm Hg), tachycardia (128 beats/min), and an elevated CVP (18 mm Hg) following massive fluid resuscitation.
Identifying abnormal and seemingly contradictory findings is the first step in advanced clinical reasoning.
2
Correlate the findings with a unifying pathophysiological mechanism.
Massive fluid resuscitation leads to severe bowel edema. The resulting increased intra-abdominal pressure compresses the renal veins (causing oliguria) and the inferior vena cava (decreasing venous return, leading to hypotension and tachycardia). It also pushes the diaphragm upward, causing high peak airway pressures and falsely elevating intrathoracic pressure (creating a high CVP artifact).
Connecting these specific respiratory, renal, and hemodynamic symptoms identifies Abdominal Compartment Syndrome (ACS).
3
Determine the priority diagnostic or therapeutic intervention.
Before definitive surgical decompression (laparotomy) can be performed, the nurse must confirm the diagnosis by objectively measuring the intra-abdominal pressure via the urinary bladder.
Measuring intra-abdominal pressure is the gold-standard initial diagnostic action for suspected ACS.

Key Concept

Abdominal Compartment Syndrome (ACS) Pathophysiology and Assessment
Rate this question

Topics

Physiological Adaptation

More questions from this topic