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Difficulty: HardPhysiological Adaptation

During a morning assessment on the progressive care unit, a nurse evaluates a client who experienced an anterior ST-elevation myocardial infarction (STEMI) three days ago. The client suddenly develops severe dyspnea, extreme restlessness, and cold, clammy skin. Vital signs demonstrate a heart rate of 134 beats/min, a respiratory rate of 36 breaths/min, and a blood pressure of 78/42 mm Hg. Cardiac auscultation reveals a newly developed loud holosystolic murmur at the apex, while pulmonary assessment shows coarse crackles throughout all lung fields. Point-of-care arterial blood gas testing reveals a pH of 7.21, a PaCO2\text{PaCO}_2 of 65 mm Hg, a PaO2\text{PaO}_2 of 48 mm Hg, and an HCO3−\text{HCO}_3^- of 24 mEq/L. Which of the following actions should the nurse implement first?

  1. Activate the rapid response team and prepare the client for emergent advanced airway management.Answer
  2. B
    Administer an intravenous push of sodium bicarbonate to correct the client's severe acidotic state.
  3. C
    Administer the client's scheduled beta-blocker to decrease myocardial oxygen demand and control the heart rate.
  4. D
    Request a stat portable chest radiograph to evaluate the extent of the suspected pulmonary fluid accumulation.

Answer

The nurse must immediately activate the rapid response team and prepare the client for emergent advanced airway management.
The client is exhibiting classic signs of acute papillary muscle rupture, a catastrophic mechanical complication of a recent myocardial infarction. This rupture leads to sudden, severe mitral regurgitation, causing rapid-onset cardiogenic shock and massive pulmonary edema. The arterial blood gas confirms uncompensated respiratory acidosis with life-threatening hypoxemia. According to the ABCs (Airway, Breathing, Circulation) of resuscitation, securing an advanced airway and providing mechanical ventilation is the absolute highest priority to treat the respiratory failure, while simultaneously mobilizing the rapid response team to prepare for emergency surgical intervention.

Step-by-Step Solution

1
Analyze the client's physical assessment findings and vital signs.
The combination of profound hypotension, cold skin, and a new apical holosystolic murmur post-MI strongly indicates acute cardiogenic shock secondary to papillary muscle rupture.
Identifying the mechanical complication explains the sudden onset of severe pulmonary edema and hemodynamic collapse.
2
Interpret the point-of-care arterial blood gas results.
The ABG shows uncompensated respiratory acidosis (low pH, high PaCO2, normal HCO3) accompanied by severe hypoxemia.
Determining the acid-base imbalance identifies impending respiratory failure due to fluid accumulation in the alveoli.
3
Prioritize the required nursing interventions using the ABC (Airway, Breathing, Circulation) framework.
Securing the airway and providing mechanical ventilation is the absolute highest priority, surpassing diagnostics or medication administration.
Without immediate oxygenation and ventilation, the hypoxemia and acidosis will rapidly lead to cardiac arrest.

Key Concept

Cardiogenic Shock and Acute Respiratory Failure Prioritization
Estimated Time:2m 0s
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Topics

Physiological Adaptation

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