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Difficulty: HardPhysiological Adaptation

A nurse is evaluating an adult client with a history of severe left ventricular failure who suddenly exhibits extreme dyspnea, copious pink-tinged frothy sputum, and profound diaphoresis. Assessment reveals cold, mottled extremities. Current vital signs are a heart rate of 134 beats/minute, respiratory rate of 36 breaths/minute, and blood pressure of 78/50 mm Hg. Arterial blood gas (ABG) analysis on room air indicates a pH of 7.15, PaCO2 of 62 mm Hg, PaO2 of 48 mm Hg, and HCO3 of 18 mEq/L. Which action should the nurse take first?

  1. Prepare the client for immediate positive pressure ventilation and anticipate the administration of an intravenous positive inotrope.Answer
  2. B
    Administer a rapid continuous infusion of isotonic crystalloid fluids to restore the client's intravascular volume and blood pressure.
  3. C
    Administer an intravenous bolus of sodium bicarbonate to directly correct the severe uncompensated metabolic acidosis.
  4. D
    Administer a high-dose intravenous loop diuretic immediately to rapidly mobilize and reduce the pulmonary fluid congestion.

Answer

The correct priority action is to prepare the client for immediate positive pressure ventilation and anticipate the administration of an intravenous positive inotrope.
The client is experiencing acute cardiogenic shock complicated by fulminant pulmonary edema, as evidenced by the profound hypotension, mottled extremities, and pink-tinged frothy sputum. The ABG reveals a life-threatening mixed respiratory and metabolic acidosis alongside severe hypoxemia. Applying the ABC (Airway, Breathing, Circulation) framework, the immediate priority is to correct the critical gas exchange failure and decrease the work of breathing via positive pressure ventilation (such as BiPAP or intubation). Concurrently, circulation must be supported with an inotrope to increase cardiac contractility without volume overloading the failing heart.

Step-by-Step Solution

1
Analyze the clinical presentation and vital signs.
The client has pink frothy sputum, dyspnea, hypotension (78/50 mm Hg), tachycardia, and mottled extremities.
These findings collectively indicate acute pulmonary edema complicated by cardiogenic shock, meaning the heart is failing as a pump and fluid is backing up into the lungs.
2
Interpret the arterial blood gas (ABG) results.
pH is severely low (7.15), PaCO2 is elevated (62 mm Hg), PaO2 is critically low (48 mm Hg), and HCO3 is low (18 mEq/L).
This indicates a severe mixed respiratory and metabolic acidosis. The respiratory component is from fluid-filled alveoli preventing gas exchange, while the metabolic component (lactic acidosis) stems from poor tissue perfusion due to cardiogenic shock.
3
Prioritize nursing interventions using the ABCs (Airway, Breathing, Circulation) and Maslow's hierarchy.
Airway and Breathing require immediate positive pressure ventilation to force fluid out of the alveoli and improve oxygenation. Circulation requires inotropic support (e.g., dobutamine) to improve the pumping action of the heart without fluid loading.
Correcting the hypoxemia and providing mechanical support decreases the work of breathing, while inotropes address the root cause of the hypotension (pump failure).

Key Concept

Prioritization in Cardiogenic Shock and Mixed Acidosis
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Topics

Physiological Adaptation

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