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Difficulty: MediumPhysiological Adaptation

A nurse is assessing a client who experienced an acute anterior myocardial infarction 2424 hours ago. Which of the following clinical findings indicate that the client is developing cardiogenic shock? Select all that apply.

  1. Urine output of 1515 mL over the past hourAnswer
  2. Sudden onset of restlessness and agitationAnswer
  3. C
    Warm, flushed skin in the distal extremities
  4. D
    Arterial blood gas showing a pH of 7.507.50, PaCO2\text{PaCO}_2 of 4040 mm Hg, and HCO3−\text{HCO}_3^- of 3232 mEq/L

Answer

The clinical findings that indicate developing cardiogenic shock are a urine output of 15 mL over the past hour and a sudden onset of restlessness and agitation.
Cardiogenic shock occurs when severe myocardial damage reduces cardiac output, compromising systemic perfusion. A urine output of 1515 mL over the past hour indicates inadequate renal blood flow, prompting the kidneys to retain fluid. A sudden onset of restlessness and agitation is a sensitive, early indicator of decreased cerebral perfusion and hypoxia. Both findings signal failing compensatory mechanisms and worsening shock.

Step-by-Step Solution

1
Identify the primary physiological risk for the client.
The client is at high risk for cardiogenic shock due to compromised left ventricular function following a large anterior myocardial infarction.
Myocardial damage impairs the heart's pumping ability, which can severely reduce cardiac output and systemic perfusion.
2
Analyze each assessment finding to determine if it reflects decreased cardiac output.
Oliguria (1515 mL/hr) reflects poor renal blood flow, and new-onset agitation reflects early cerebral hypoxia. Both are direct consequences of falling cardiac output.
During early shock, blood is shunted away from the kidneys (lowering urine output), and the brain is highly sensitive to even mild decreases in oxygen delivery.
3
Evaluate the remaining options to rule out distractors.
The skin temperature finding and the ABG values do not align with the hemodynamics of cardiogenic shock.
Cardiogenic shock triggers compensatory vasoconstriction (causing cool, clammy skin) and anaerobic metabolism (causing metabolic acidosis, not alkalosis).

Key Concept

Early Assessment of Cardiogenic Shock
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Topics

Physiological Adaptation

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