Cushing’s triad includes?

SCTIMST Staff Nurse - 2015 (Set-B)

Medical & Surgical Nursing

Easy

Appeared in: SCTIMST Staff Nurse - 2015 (Set-B)

Explanation

Cushing's triad is a critical neurological sign indicating severely increased intracranial pressure (ICP).
It consists of three specific findings: bradycardia (a slow pulse), hypertension with a widened pulse pressure, and an abnormal or irregular respiratory pattern.
A widened pulse pressure is the difference between the systolic and diastolic blood pressure. In this case, the systolic pressure rises significantly while the diastolic pressure changes little.
The abnormal breathing pattern, such as Cheyne-Stokes respirations or bradypnea, results from pressure on the brainstem's respiratory centers.

Option A: This combination of signs is not Cushing's triad. While it includes high blood pressure, edema and oliguria (decreased urine output) are more commonly associated with renal or cardiovascular conditions like preeclampsia or heart failure.
Option C: This option is incorrect because it lists tachypnea (rapid breathing), whereas Cushing's triad involves an irregular and often slow respiratory pattern (bradypnea). Hypoxia and increased temperature are non-specific signs of distress or infection.
Option D: Although a slow pulse is part of the triad and pupillary asymmetry is a serious neurological sign, hypoxia is not a defining feature of Cushing's triad. The triad describes specific cardiovascular and respiratory responses to brainstem compression.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of the clinical signs comprising Cushing's triad as background academic context rather than a clinical decision trigger.
Recognizing Cushing's triad is a critical nursing skill, as it signifies a late-stage neurological emergency (impending brain herniation) requiring immediate physician notification and intervention.
A nurse's prompt assessment and reporting of these vital sign changes can be life-saving, triggering urgent actions like administering osmotic diuretics or preparing for surgical decompression.
What if? If a patient with a head injury develops tachycardia (fast heart rate) and hypotension (low blood pressure) instead, the nurse should suspect hypovolemic shock from internal bleeding, not increased ICP, leading to a different set of interventions (e.g., fluid resuscitation).

How to Approach the Question

First, identify the core concept of the question, which is the definition of 'Cushing's triad'.
This is a factual recall question. Access your knowledge about the signs of increased intracranial pressure (ICP).
Recall that Cushing's triad is a specific, late sign of ICP.
Systematically evaluate each option against the three classic components: bradycardia, hypertension with widened pulse pressure, and irregular respirations.
Eliminate options that contain incorrect or non-specific signs, such as tachypnea, hypoxia, or edema, until you find the option that correctly lists all three components.

Concept Tested & Keywords

Concept Tested: Identification of the clinical signs comprising Cushing's triad.
Stem keywords: Cushing’s triad
Lead-in keywords: includes
Negative lead-in flag: false