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Difficulty: HardReduction of Risk Potential

A client with stage 5 chronic kidney disease (CKD) arrives at the emergency department after missing three consecutive hemodialysis sessions. The client is lethargic and exhibits deep, rapid respirations at a rate of 34 breaths/min34 \text{ breaths/min}. An electrocardiogram (ECG) reveals tall, peaked T waves. The most recent arterial blood gas (ABG) shows a pH of 7.227.22, PaCO2 of 28 mm Hg28 \text{ mm Hg}, PaO2 of 96 mm Hg96 \text{ mm Hg}, and HCO3- of 12 mEq/L12 \text{ mEq/L}. To reduce the risk of imminent physiological collapse, which prescribed action should the nurse implement FIRST?

  1. A
    Prepare the client for immediate endotracheal intubation and mechanical ventilation.
  2. Administer intravenous regular insulin concurrently with 50%50\% dextrose.Answer
  3. C
    Apply a non-rebreather mask at 15 L/min15 \text{ L/min} to address the severe respiratory distress.
  4. D
    Administer oral sodium polystyrene sulfonate to permanently eliminate excess electrolytes.

Answer

The correct priority action is to administer intravenous regular insulin concurrently with 50% dextrose.
The correct action directly addresses the most critical, life-threatening physiological abnormality: severe hyperkalemia. In a client with stage 5 CKD who has missed dialysis, the presence of peaked T waves indicates imminent cardiac toxicity. Intravenous regular insulin facilitates the rapid intracellular shift of potassium, temporarily lowering serum levels and protecting the myocardium from fatal dysrhythmias, while concurrent 50%50\% dextrose prevents severe hypoglycemia.

Step-by-Step Solution

1
Analyze the clinical history and physical presentation.
The client has stage 5 CKD and missed three dialysis sessions, putting them at extreme risk for uremia, volume overload, and severe hyperkalemia. The lethargy and rapid breathing are critical systemic signs.
Identifying the root cause of the client's deterioration guides the entire resuscitation effort.
2
Interpret the ECG findings.
The presence of tall, peaked T waves is a hallmark electrocardiographic sign of critical hyperkalemia.
Hyperkalemia decreases the resting membrane potential of the myocardium, leading to fatal arrhythmias such as ventricular fibrillation or asystole if not rapidly treated.
3
Interpret the Arterial Blood Gas (ABG) values.
The pH (7.227.22) and HCO3- (12 mEq/L12 \text{ mEq/L}) demonstrate severe uncompensated/partially compensated metabolic acidosis. The PaCO2 (28 mm Hg28 \text{ mm Hg}) is low due to Kussmaul respirations (hyperventilation), which is the body's attempt to compensate by blowing off volatile acids.
Accurate ABG interpretation prevents the dangerous misstep of treating compensatory hyperventilation as a primary respiratory failure.
4
Select the intervention that addresses the most immediate life threat.
Administering IV regular insulin with 50%50\% dextrose is chosen.
Insulin acts rapidly to shift potassium from the intravascular space into the intracellular space, stabilizing the cardiac membrane within minutes. Dextrose is required to prevent profound hypoglycemia.

Key Concept

Emergency Management of Severe Hyperkalemia and ABG Interpretation

Alternative Method

Another valid, immediate first-line intervention for severe hyperkalemia with ECG changes is the administration of intravenous calcium gluconate. While it does not lower the serum potassium level, it immediately stabilizes the myocardial resting membrane potential, reducing the risk of lethal dysrhythmias while potassium-shifting agents are prepared.
Estimated Time:1m 30s
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Topics

Reduction of Risk Potential

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