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Difficulty: HardReduction of Risk Potential

A 28-year-old client is 4 hours postoperative following an emergency open splenectomy for abdominal trauma. Over the past two hours, the nurse notes the client's heart rate has increased from 88 to 116 beats per minute, and urine output has decreased to 15 mL/hr. The current blood pressure is 104/78 mm Hg. The nurse reviews the most recent arterial blood gas (ABG) results: pH 7.31, PaCO2 36 mm Hg, PaO2 94 mm Hg, and HCO3 16 mEq/L. Based on these findings, which interpretation and corresponding action are the highest priority for the nurse to mitigate impending physiological decompensation?

  1. Recognize the uncompensated metabolic acidosis as an indicator of inadequate tissue perfusion and prepare to rapidly administer prescribed intravenous isotonic fluids or blood products.Answer
  2. B
    Interpret the laboratory values as uncompensated respiratory acidosis caused by shallow breathing and aggressively encourage the client to use the incentive spirometer.
  3. C
    Attribute the trending vital signs to an expected sympathetic nervous system response to surgical pain and administer the prescribed intravenous opioid analgesic.
  4. D
    Identify the signs of developing hypovolemia and immediately place the client in a high-Fowler's position to promote blood flow to the vital organs.

Answer

The nurse must recognize the uncompensated metabolic acidosis as a sign of inadequate tissue perfusion caused by hypovolemic shock, and prepare to rapidly administer intravenous fluids or blood products.
The client's clinical presentation following a highly vascular open splenectomy strongly suggests internal hemorrhage leading to hypovolemic shock. The rising heart rate, narrowing pulse pressure, and severe oliguria (15 mL/hr) are compensatory mechanisms attempting to maintain cardiac output. As circulating volume drops, tissues are deprived of oxygen, forcing them into anaerobic metabolism. This produces lactic acid, which manifests on the ABG as an uncompensated metabolic acidosis (pH < 7.35, normal PaCO2, and HCO3 < 22 mEq/L). The absolute priority risk-reduction intervention is to restore tissue perfusion and oxygen delivery by rapidly administering prescribed isotonic fluids or blood products.

Step-by-Step Solution

1
Analyze the vital sign and urine output trends in the context of the surgical procedure.
The client had a highly vascular surgery (splenectomy) and is exhibiting increasing tachycardia, a narrowing pulse pressure, and severe oliguria.
These are classic compensatory signs of active hemorrhage and impending hypovolemic shock.
2
Interpret the provided Arterial Blood Gas (ABG) values.
The pH is low (7.31), indicating acidemia. The PaCO2 is normal (36 mm Hg). The HCO3 is low (16 mEq/L), identifying the primary issue as uncompensated metabolic acidosis.
Accurate ABG interpretation is required to determine the physiological source of the client's decompensation.
3
Synthesize the assessment data with the pathophysiological process.
The metabolic acidosis is the direct result of inadequate tissue perfusion; lack of oxygen forces cells into anaerobic metabolism, producing lactic acid.
Connecting the lab values to the clinical signs confirms the diagnosis of tissue hypoxia secondary to volume loss.
4
Determine the highest priority nursing intervention to reduce the risk of mortality.
The nurse must act immediately to restore circulating blood volume with isotonic IV fluids or blood products.
Without rapid volume expansion, the client will progress from compensatory shock to irreversible shock and multi-organ failure.

Key Concept

Early recognition of hypovolemic shock and interpretation of metabolic acidosis as a late sign of impaired tissue perfusion.
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Reduction of Risk Potential

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