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Difficulty: MediumPhysiological Adaptation

A client with a closed head injury is being continuously monitored in the neuro-intensive care unit. The nurse suspects the client's intracranial pressure (ICP) is rising to a critical level, initiating the physiological adaptation known as Cushing's triad. Which of the following vital sign trends support this clinical deterioration? (Select all that apply)

  1. A widening pulse pressure, with blood pressure changing from 124/78 mm Hg to 178/70 mm HgAnswer
  2. A gradual decrease in heart rate from 86 beats/min to 44 beats/minAnswer
  3. C
    A narrowing pulse pressure with a systolic blood pressure dropping to 88 mm Hg
  4. An irregular respiratory pattern alternating between deep breathing and periods of apneaAnswer
  5. E
    A sustained, unexplained sinus tachycardia of 125 beats/min

Answer

The vital sign trends that indicate Cushing's triad are a widening pulse pressure (severe systolic hypertension), a decreasing heart rate (bradycardia), and an irregular respiratory pattern.
Cushing's triad is a life-threatening physiological reflex indicating impending brain herniation. It is characterized by severe systolic hypertension causing a widening pulse pressure, profound bradycardia due to baroreceptor stimulation, and irregular respirations resulting from direct brainstem compression. The correct options directly describe these three classic adaptations.

Step-by-Step Solution

1
Analyze the clinical scenario and the client's current risk factors.
The client has sustained a closed head injury, placing them at severe risk for increased intracranial pressure (ICP) and impaired cerebral perfusion.
Understanding the primary pathology guides the anticipation of specific physiological adaptations and decompensation patterns.
2
Identify the distinct physiological parameters that define Cushing's triad.
Cushing's triad consists of three specific signs: severe hypertension with a widened pulse pressure, bradycardia, and irregular respirations.
Cushing's response is a central nervous system reflex where the body intensely elevates systemic blood pressure to overcome high ICP, which secondarily triggers a parasympathetic slowing of the heart rate, while brainstem compression disrupts normal breathing.
3
Evaluate each answer choice against the components of Cushing's triad.
The choices describing widening pulse pressure, bradycardia, and apnea match the triad perfectly. The choices describing narrowing pulse pressure and tachycardia reflect hypovolemic shock patterns.
Accurate differentiation between neurological decompensation and systemic shock prevents fatal misinterpretations of vital sign trends.

Key Concept

Cushing's Triad and Impaired Neurological Adaptation
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Topics

Physiological Adaptation

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