Nursing care
Cushing Triad, explained for the bedside and the exam
Written and reviewed by Dana Whitfield, RN, MSN · 4 min read · Updated September 2026
Short answer
Cushing triad is widening pulse pressure, bradycardia and irregular respirations, produced when rising intracranial pressure compresses the brainstem. It is a late finding. By the time all three are present, herniation is close, and the priority is an immediate call to the provider, not further observation.
Defining it precisely
Cushing triad is the body's last attempt to keep blood flowing to a brain under rising pressure. Systolic pressure climbs while diastolic stays put or falls, so pulse pressure widens. Heart rate drops, often into the 40s or 50s. Respirations turn irregular, sometimes with long pauses or a Cheyne-Stokes pattern.
The mechanism is the Cushing reflex: as intracranial pressure approaches mean arterial pressure, cerebral perfusion falls, and the medulla drives systemic blood pressure up to force blood through. Baroreceptors then sense that higher pressure and slow the heart. The respiratory change reflects brainstem compression itself, not a reflex to protect it. All three together point to pressure severe enough to threaten the brainstem directly.
The exceptions that matter
Not every patient shows the full triad, and its absence does not mean intracranial pressure is normal. Children compensate differently and can decompensate with tachycardia instead of bradycardia before the classic picture appears. Patients on beta blockers may not mount the expected bradycardia at all, since the drug blunts the reflex.
The triad is also a late sign. Earlier indicators of rising intracranial pressure, a falling Glasgow Coma Scale score, a new or worsening headache, vomiting without nausea, and pupillary change, will typically appear first. Waiting for the triad to confirm a suspicion you already have from those earlier signs costs time you do not have.
Using it to prioritise
In a prioritisation question, Cushing triad outranks almost anything short of an unprotected airway or cardiac arrest. If a patient with a head injury or known intracranial process shows a widening pulse pressure, a slowing heart rate and an irregular respiratory pattern together, that patient goes to the top of your assessment queue and the provider gets called immediately.
Do not spend time repeating a full neuro check before escalating. A brief reassessment, a level of consciousness check and pupil check, is reasonable while someone else notifies the provider, but the notification should not wait on it. This is a situation where simultaneous action, not sequential action, is correct.
Traps in exam wording
Questions often list only two of the three findings and ask what to suspect. Widening pulse pressure plus bradycardia, without mentioning respirations, is still meant to point you toward Cushing triad and rising intracranial pressure. Do not dismiss the option because the stem is incomplete.
Another common trap pairs bradycardia with hypotension and asks you to identify Cushing triad, that is not it. Cushing triad requires a widening pulse pressure, which means systolic pressure is rising or holding while diastolic falls, not a simple drop in blood pressure. Read the numbers, not just the direction of the heart rate.
Examples from practice
A patient two days post craniotomy has a blood pressure of 168/72, a heart rate of 48, and respirations that are irregular with intermittent pauses. Pulse pressure is 96, wide for that systolic. This is the triad, and it warrants an immediate provider call and preparation for possible imaging or surgical intervention.
Contrast that with a patient whose blood pressure is 88/54 and heart rate is 45. Pulse pressure is 34, not widened, and the picture looks more like a cardiac or vagal event than rising intracranial pressure. Same bradycardia, different diagnosis, because the pulse pressure tells you which direction to think.
Summary
Cushing triad is widening pulse pressure, bradycardia and irregular respirations, and it signals that intracranial pressure has risen enough to compress the brainstem. Treat it as a late finding, not a first warning, and act on earlier signs of deterioration without waiting for all three to appear.
When the triad does appear, escalate immediately. The gap between recognising it and herniation can be measured in minutes, and the nursing response is notification and preparation, not documentation and reassessment.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our neurological practice questions are the closest set to what this page covers.
Common questions
Is Cushing triad the same as Cushing syndrome?
No. Cushing syndrome is caused by excess cortisol and has an entirely different presentation, including weight gain and a moon face. Cushing triad is a neurological finding tied to intracranial pressure. Both are named for the same physician, which is the only connection.
What is the first sign of rising intracranial pressure, if not the triad?
A change in level of consciousness is typically the earliest and most sensitive sign, often before any vital sign changes. Watch for new confusion, restlessness, or a drop in Glasgow Coma Scale score before vital signs shift.
Do all three signs of Cushing triad appear at the same time?
Not always, and the order can vary between patients. Some clinicians see the blood pressure change first, others see respiratory changes emerge alongside it. Any two of the three in a patient with known or suspected intracranial pressure elevation should prompt the same urgency as all three.
What should a nurse do first after recognising Cushing triad?
Notify the provider immediately and prepare for likely interventions such as imaging, osmotic therapy, or surgical evacuation. A brief neuro check to confirm your suspicion is reasonable, but it should not delay the notification.