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Difficulty: MediumPhysiological Adaptation

A client who sustained an extensive anterior wall myocardial infarction is receiving care in the coronary intensive care unit. Which of the following clinical indicators should alert the nurse that the client is transitioning into cardiogenic shock? Select all that apply.

  1. Urine output of 15 mL/hr for two consecutive hoursAnswer
  2. Cool, clammy skin with delayed capillary refillAnswer
  3. C
    Arterial blood gas results demonstrating respiratory alkalosis
  4. Increasing restlessness and new-onset confusionAnswer
  5. E
    Widened pulse pressure and bounding peripheral pulses

Answer

The clinical indicators of cardiogenic shock include urine output of 15 mL/hr for two consecutive hours, cool and clammy skin with delayed capillary refill, and increasing restlessness with new-onset confusion.
Cardiogenic shock represents severe left ventricular failure resulting in profound hypoperfusion to systemic tissues. The body attempts to compensate through sympathetic nervous system activation, which causes peripheral vasoconstriction (manifesting as cool, clammy skin). As vital organs are deprived of oxygen-rich blood, early end-organ dysfunction occurs, presenting as altered mentation due to cerebral hypoxia and oliguria due to renal hypoperfusion. Recognizing these early signs is critical for timely, life-saving interventions.

Step-by-Step Solution

1
Identify the underlying pathophysiology of cardiogenic shock.
Cardiogenic shock results from severe pump failure, leading to significantly decreased cardiac output and inadequate tissue perfusion.
Understanding the core mechanism helps predict the systemic compensatory responses and end-organ effects.
2
Evaluate each option against the expected physiological adaptations to decreased cardiac output.
Restlessness (decreased cerebral perfusion), oliguria (decreased renal perfusion), and cool/clammy skin (compensatory peripheral vasoconstriction) align with poor systemic perfusion.
End-organ ischemia produces predictable clinical manifestations that require rapid identification.
3
Differentiate expected shock findings from the incorrect distractors.
Lactic acid buildup causes metabolic acidosis (not respiratory alkalosis), and decreased stroke volume causes a narrow pulse pressure with weak pulses (not widened/bounding).
Eliminating findings that contradict the hemodynamics of pump failure ensures accurate clinical judgment.

Key Concept

Clinical Manifestations of Cardiogenic Shock
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Topics

Physiological Adaptation

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