Examkin

Question

Difficulty: HardPhysiological Adaptation

During the morning rounds, a client who experienced a massive anterior myocardial infarction 12 hours prior is evaluated by the nursing team. Which of the following assessment findings should immediately alert the team to the early development of cardiogenic shock? Select all that apply.

  1. Pulse pressure narrows from 45 mm Hg to 20 mm HgAnswer
  2. The client exhibits new-onset restlessness and mild agitationAnswer
  3. Urine output totals 35 mL over the past two hoursAnswer
  4. D
    Heart rate decreases from 85 to 54 beats per minute
  5. E
    Skin on the lower extremities is warm and visibly flushed

Answer

The early indicators of cardiogenic shock in this client are a narrowed pulse pressure, new-onset restlessness, and significant oliguria (35 mL over two hours).
Cardiogenic shock occurs when the heart fails to pump adequately, leading to reduced cardiac output and impaired tissue perfusion. The body's early compensatory mechanisms activate the sympathetic nervous system, causing peripheral vasoconstriction (which narrows the pulse pressure). Because blood flow to vital organs is compromised, early cerebral hypoxia manifests as restlessness or agitation, and decreased renal perfusion leads to immediate oliguria (urine output significantly less than the minimum 30 mL/hr baseline).

Step-by-Step Solution

1
Identify the client's underlying risk profile.
The client had a massive anterior myocardial infarction 12 hours ago, which places them at extreme risk for left ventricular failure and subsequent cardiogenic shock.
Anterior MIs often involve a large portion of the left ventricle, severely compromising the heart's pumping ability.
2
Evaluate the hemodynamic parameters for signs of compensatory mechanisms.
A pulse pressure that narrows from 45 mm Hg to 20 mm Hg indicates compensatory peripheral vasoconstriction.
As cardiac output falls, the sympathetic nervous system constricts peripheral vessels, raising diastolic pressure while systolic pressure remains low or falls, causing the pulse pressure to narrow.
3
Assess systemic organ perfusion based on neurological and renal findings.
New-onset restlessness indicates cerebral hypoxia. A urine output of 35 mL over two hours (17.5 mL/hr) indicates compromised renal perfusion.
The brain and kidneys are highly sensitive to decreases in cardiac output. Restlessness is one of the earliest signs of hypoxia, and urine output falling below 30 mL/hr is a primary indicator of organ hypoperfusion.
4
Differentiate the findings of cardiogenic shock from other types of shock.
Bradycardia and warm, flushed skin are excluded.
Cardiogenic shock typically triggers compensatory tachycardia and causes cool, clammy skin due to systemic vasoconstriction. Warm, flushed skin is associated with distributive shock.

Key Concept

Early Assessment and Recognition of Cardiogenic Shock
Rate this question

Topics

Physiological Adaptation

More questions from this topic