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Difficulty: MediumPhysiological Adaptation

An older adult client is recovering in the cardiac intensive care unit following an acute anterior myocardial infarction. During the morning assessment, the nurse suspects the client is developing early cardiogenic shock. Which of the following clinical findings support this complication? (Select all that apply.)

  1. Urine output of 22 mL over the past hourAnswer
  2. New-onset agitation and restlessnessAnswer
  3. C
    Warm, flushed skin on the lower extremities
  4. Apical pulse of 118 beats per minuteAnswer
  5. E
    Widening pulse pressure

Answer

The clinical findings supporting cardiogenic shock include a low urine output (22 mL/hr), new-onset agitation and restlessness, and tachycardia (apical pulse of 118 beats per minute).
Cardiogenic shock represents severe pump failure, severely limiting forward blood flow. The body attempts to compensate through sympathetic nervous system activation, resulting in an increased heart rate. End-organ hypoperfusion quickly manifests as altered mental status (restlessness and agitation) due to brain hypoxia, and decreased urine output (less than 30 mL/hr) due to compromised renal blood flow.

Step-by-Step Solution

1
Identify the primary pathophysiology of cardiogenic shock.
Cardiogenic shock involves severe impairment of the heart's pumping ability, leading to significantly decreased cardiac output and inadequate tissue perfusion.
Understanding the mechanism of pump failure provides the foundation for anticipating clinical manifestations.
2
Evaluate the compensatory mechanisms attempting to maintain cardiac output.
The sympathetic nervous system activates, causing an increased heart rate (tachycardia) and peripheral vasoconstriction to maintain blood pressure.
This explains the rapid apical pulse and explains why the skin would be cool and clammy, ruling out warm and flushed extremities.
3
Assess indicators of end-organ perfusion.
Decreased blood flow to the brain causes altered mental status (restlessness), and decreased flow to the kidneys drops urine output below the minimal adequate threshold of 30 mL/hr.
Organ dysfunction confirms that the compensatory mechanisms are failing to provide adequate systemic circulation.
4
Analyze blood pressure changes specific to cardiogenic shock.
Because the heart cannot eject a normal stroke volume (lowering systolic pressure) and blood vessels constrict (raising diastolic pressure), the pulse pressure narrows.
This differentiates pump failure from distributive shock types or neurological conditions that might widen the pulse pressure.

Key Concept

Early Recognition of Cardiogenic Shock
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Topics

Physiological Adaptation

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