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Question

Difficulty: HardReduction of Risk Potential

A clinical nurse is evaluating a client who underwent an open bowel resection with a temporary colostomy formation 4848 hours ago. The client has a nasogastric (NG) tube connected to low intermittent suction, which has drained 950950 mL of fluid over the past 1212 hours. Which cluster of clinical data indicates the highest risk for a physiological crisis and requires the most immediate intervention?

  1. A
    Arterial blood gas values showing pH 7.337.33, PaCO 2_2 4949 mm Hg, and HCO 3−_3^- 2525 mEq/L, with a respiratory rate of 1414 breaths per minute
  2. B
    A blood pressure decrease from 128/78128/78 mm Hg to 116/70116/70 mm Hg, a heart rate of 9494 beats per minute, and capillary refill of 22 seconds
  3. Serum potassium of 2.72.7 mEq/L (2.72.7 mmol/L), flattened T waves on the electrocardiogram, and generalized muscle weaknessAnswer
  4. D
    The client is resting in a supine position, with the stoma appearing edematous and dark pink, producing minimal serosanguineous output

Answer

The cluster of clinical data indicating severe hypokalemia, specifically the serum potassium of 2.7 mEq/L combined with flattened T waves and muscle weakness, requires the most immediate intervention.
Prolonged gastric suctioning removes significant amounts of potassium-rich gastric fluids, placing the client at extremely high risk for severe hypokalemia. A serum potassium level of 2.72.7 mEq/L is critically low (normal range is 3.53.5 to 5.05.0 mEq/L). The presence of flattened T waves and generalized muscle weakness are classic, active manifestations of hypokalemia that can rapidly deteriorate into lethal cardiac dysrhythmias (such as ventricular tachycardia or fibrillation), making this the highest priority for life-saving intervention.

Step-by-Step Solution

1
Analyze the client's current treatments and risk factors.
The client has a nasogastric tube draining large amounts of gastric fluid (950 mL in 12 hours), placing them at high risk for electrolyte imbalances, specifically hypokalemia and metabolic alkalosis.
Gastric fluid is rich in potassium, hydrogen, and chloride ions; excessive loss directly disrupts physiological integrity.
2
Evaluate the arterial blood gas (ABG) values and respiratory status.
The ABG reveals mild, uncompensated respiratory acidosis (low pH, elevated PaCO2, normal HCO3-) typical of post-operative pain causing shallow breathing. This requires nursing intervention (incentive spirometry) but is not an immediate lethal crisis.
Distinguishing between expected post-operative alterations and critical emergencies is essential for prioritization.
3
Assess the hemodynamic parameters for signs of shock.
The slight decrease in blood pressure, heart rate of 94, and 2-second capillary refill indicate normal compensatory fluid shifts post-surgery, maintaining adequate perfusion.
Early hypovolemic shock would present with more profound tachycardia, narrowing pulse pressure, and delayed capillary refill.
4
Assess the colostomy and positioning data.
An edematous, dark pink stoma with minimal output is perfectly normal 48 hours after creation.
Recognizing expected post-operative stoma maturation prevents unnecessary escalation of care.
5
Evaluate the electrolyte and electrocardiogram (ECG) data.
A potassium level of 2.7 mEq/L is critically low. The flattened T waves and muscle weakness are active physiological manifestations of this deficit, signaling an impending lethal cardiac dysrhythmia.
Active cardiac involvement from severe electrolyte depletion represents the highest, most immediate risk to the client's life.

Key Concept

Reduction of Risk Potential: Complications of Gastrointestinal Suctioning and Severe Hypokalemia
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Topics

Reduction of Risk Potential

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