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Difficulty: MediumPhysiological Adaptation

A nurse is evaluating a client who sustained a massive anterior wall myocardial infarction 24 hours ago. Which of the following clinical findings indicate the client is developing cardiogenic shock? Select all that apply.

  1. Blood pressure of 86/70 mm HgAnswer
  2. Urine output of 40 mL over the past 3 hoursAnswer
  3. Cool, clammy skin with delayed capillary refillAnswer
  4. D
    Warm, flushed extremities
  5. E
    Arterial blood gas results showing pH 7.48, PaCO2 42 mm Hg, and HCO3- 29 mEq/L

Answer

The clinical findings that indicate cardiogenic shock are a blood pressure of 86/70 mm Hg, a urine output of 40 mL over the past 3 hours, and cool, clammy skin with delayed capillary refill.
Cardiogenic shock occurs when the heart's pumping ability is severely compromised, leading to decreased cardiac output and inadequate tissue perfusion. A blood pressure of 86/70 mm Hg demonstrates hypotension with a narrowed pulse pressure (16 mm Hg), reflecting decreased stroke volume and compensatory systemic vasoconstriction. A urine output of 40 mL over 3 hours (approximately 13 mL/hr) indicates severely diminished renal perfusion (oliguria). Cool, clammy skin with delayed capillary refill is a result of the sympathetic nervous system shunting blood away from the periphery to preserve vital organ function.

Step-by-Step Solution

1
Analyze the client's risk factors based on the clinical presentation.
The client experienced a massive anterior wall myocardial infarction, which significantly damages the left ventricle and places the client at high risk for pump failure (cardiogenic shock).
Identifying the underlying etiology helps anticipate the specific pathophysiological changes that will occur if the condition deteriorates.
2
Recall the pathophysiology and compensatory mechanisms associated with cardiogenic shock.
Cardiogenic shock is characterized by a severe drop in cardiac output and tissue perfusion. The body compensates via the sympathetic nervous system by causing profound peripheral vasoconstriction to maintain blood pressure and shunt blood to vital organs.
Understanding the mechanism allows for the logical deduction of expected clinical signs, such as cold skin, narrowed pulse pressure, and decreased end-organ perfusion.
3
Evaluate each option to determine if it aligns with the expected signs of cardiogenic shock.
Hypotension with a narrow pulse pressure, oliguria (poor renal perfusion), and cool/clammy skin are direct results of pump failure and vasoconstriction. Warm extremities suggest vasodilation (distributive shock), and metabolic alkalosis contradicts the expected lactic acidosis.
Systematically filtering the choices prevents the selection of distractors that represent other types of shock or incorrect acid-base imbalances.

Key Concept

Cardiogenic shock manifests with signs of decreased cardiac output and compensatory systemic vasoconstriction, including hypotension with a narrowed pulse pressure, oliguria, cool/clammy skin, and metabolic acidosis.
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Topics

Physiological Adaptation

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