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Difficulty: HardPhysiological Adaptation

A nurse is assessing a client who is 44 hours postoperative following an open abdominal procedure. The surgical dressing is dry and intact, and a closed-suction drain has collected 15 mL15\text{ mL} of serosanguineous fluid. The client has become increasingly restless over the past hour. Current vital signs are: blood pressure 104/86 mmHg104/86\text{ mmHg}, heart rate 118 beats/min118\text{ beats/min}, and respiratory rate 24 breaths/min24\text{ breaths/min}. An arterial blood gas (ABG) analysis reveals a pH of 7.337.33, PaCO 2_2 of 32 mmHg32\text{ mmHg}, and HCO 3−_3^- of 16 mEq/L16\text{ mEq/L}. Based on this physiological presentation, which is the priority nursing intervention?

  1. Prepare to administer a rapid intravenous bolus of an isotonic crystalloid solution.Answer
  2. B
    Instruct the client to take slow, deep breaths to correct the respiratory abnormality.
  3. C
    Administer the prescribed intravenous opioid analgesic to manage the acute restlessness.
  4. D
    Elevate the head of the client's bed to a high-Fowler's position to optimize oxygenation.

Answer

The correct priority intervention is to prepare to administer a rapid intravenous bolus of an isotonic crystalloid solution.
The client is in the early compensatory stage of hypovolemic shock, likely due to a concealed internal hemorrhage following abdominal surgery. This is evidenced by the narrowed pulse pressure (18 mmHg18\text{ mmHg}), tachycardia, and restlessness. The inadequate tissue perfusion has led to anaerobic metabolism and lactic acidosis, reflected in the ABG as a partially compensated metabolic acidosis. The absolute priority is to restore intravascular volume and tissue perfusion by administering isotonic crystalloids.

Step-by-Step Solution

1
Analyze the vital signs to identify hemodynamic trends.
The blood pressure of 104/86 mmHg shows a significantly narrowed pulse pressure of 18 mmHg. Combined with tachycardia (118 beats/min) and restlessness, this strongly indicates early compensatory hypovolemic shock, likely from a concealed internal hemorrhage.
Recognizing subtle early signs of shock is critical before the client decompensates into irreversible hypotension.
2
Interpret the arterial blood gas (ABG) values.
The pH of 7.33 indicates acidemia. The HCO3- of 16 mEq/L is low (indicating primary metabolic acidosis), and the PaCO2 of 32 mmHg is low (indicating partial respiratory compensation).
ABG analysis helps determine the physiological impact of the shock state. Tissue hypoperfusion leads to anaerobic metabolism, causing lactic acidosis.
3
Determine the priority nursing intervention based on the physiological root cause.
The root cause of the metabolic acidosis and vital sign changes is intravascular volume depletion. The priority is to restore circulating volume with isotonic crystalloids.
Treating the underlying cause (hypovolemia) will restore tissue perfusion, resolve the lactic acidosis, and stabilize the vital signs.

Key Concept

Early Recognition and Management of Hypovolemic Shock
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Topics

Physiological Adaptation

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