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Difficulty: MediumPhysiological Adaptation

During shift report on a progressive care unit, a nurse receives handoff for a client recovering from a massive anterior wall myocardial infarction. The previous shift's documented vital signs were: blood pressure 128/74 mm Hg, heart rate 80 beats/min, and respiratory rate 14/min. Upon initial rounds, the nurse observes the client fidgeting in bed. Vital signs are now: blood pressure 104/86 mm Hg, heart rate 118 beats/min, and respiratory rate 24/min. Which of the following conclusions should the nurse draw from this assessment?

  1. A
    The client maintains adequate cardiac tissue perfusion because the systolic blood pressure remains greater than 100 mm Hg.
  2. B
    The client is experiencing acute anxiety and psychological stress related to the recent cardiac event.
  3. The client is exhibiting early compensatory mechanisms indicative of impending cardiogenic shock.Answer
  4. D
    The client is demonstrating an expected, benign hypermetabolic inflammatory response to myocardial necrosis.

Answer

The client is exhibiting early compensatory mechanisms indicative of impending cardiogenic shock.
The correct answer accurately identifies that a narrowing pulse pressure (dropping from 54 mm Hg to 18 mm Hg), unexplained tachycardia, tachypnea, and new-onset restlessness are early, compensatory signs of cardiogenic shock. These physiological changes represent the body's attempt to maintain cardiac output following severe left ventricular damage from the anterior myocardial infarction.

Step-by-Step Solution

1
Calculate the client's current pulse pressure and compare it to the baseline.
Baseline pulse pressure was 54 mm Hg (128 - 74). Current pulse pressure is 18 mm Hg (104 - 86).
A narrowing pulse pressure is a critical early indicator of decreased stroke volume and impending shock.
2
Analyze the other vital sign changes and physical assessment findings.
The heart rate increased from 80 to 118 beats/min, respiratory rate increased from 14 to 24/min, and the client developed new-onset restlessness.
Tachycardia and tachypnea are compensatory mechanisms for decreased cardiac output, while restlessness is an early sign of cerebral hypoxia resulting from poor perfusion.
3
Synthesize the findings with the client's medical history.
The combination of severely narrowed pulse pressure, tachycardia, tachypnea, and altered mental status in a post-myocardial infarction client indicates early cardiogenic shock.
Anterior myocardial infarctions heavily damage the left ventricle, placing the client at high risk for severe pump failure (cardiogenic shock).

Key Concept

Early recognition of cardiogenic shock through subtle vital sign trends, specifically narrowing pulse pressure and compensatory tachycardia.
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Topics

Physiological Adaptation

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