Epidural vs subdural haematoma: bleeding source, timing and neuro check priorities

Speed of decline follows the bleeding source

The most differentiating feature is how fast the bleed expands. Epidural haematomas usually come from an artery torn by a skull fracture, classically the middle meningeal artery under the temporal bone. Arterial pressure expands the clot quickly between skull and dura, so a large epidural bleed can cause rapid deterioration without surgery.

Subdural haematomas form when bridging veins between the brain surface and the dura stretch and tear. Venous bleeding is lower pressure. An acute subdural after severe trauma can still be rapidly dangerous, but a chronic subdural may accumulate over weeks and present with gradual confusion, headache, unsteadiness or personality change that is easily mistaken for dementia.

Who is typically affected

Epidural haematoma is more common in younger people, in whom the dura is less firmly attached to the skull, and usually follows a clear blow to the head. The classic sequence is brief loss of consciousness, a period of alertness, then decline. That lucid interval is important but not universal, so its absence does not exclude an epidural bleed.

Chronic subdural haematoma is typical of older adults. Brain atrophy stretches the bridging veins, and anticoagulants, antiplatelet drugs, long-term alcohol use and clotting disorders increase risk. The injury may have been minor or forgotten, so ask about falls in any older client with new confusion, particularly one taking blood thinners.

Overlapping signs and what imaging adds

Both bleeds raise intracranial pressure and share warning signs: worsening headache, vomiting, drowsiness, confusion, seizures, a dilating pupil on one side and weakness on the opposite side. Pupil dilation with loss of reactivity suggests herniation. Hypertension with bradycardia and irregular respirations, the Cushing triad, is a late sign of severe pressure.

Bedside findings cannot reliably tell the two apart, which is why CT is used. Epidural blood typically appears lens shaped and does not cross suture lines; acute subdural blood appears crescent shaped and can cross sutures. The nurse does not need to read the scan but should understand that it, not the neuro check, settles the type.

Neuro check priorities for each bleed

After a head injury with possible epidural bleeding, frequent neurological observations matter even if the client looks well. Track level of consciousness and Glasgow Coma Scale score, pupils, limb strength and vital signs at the ordered frequency. A falling GCS, new unequal pupils or new weakness requires immediate escalation, because surgery may be needed urgently.

For a suspected chronic subdural, establish a baseline of orientation, gait and behaviour and compare against family descriptions of the person's usual function. Report the anticoagulant history promptly so reversal can be considered. Subtle change across shifts, such as slower responses, may be the earliest clue, so document specific findings rather than general labels.

Between checks, nursing measures help limit rising intracranial pressure: head of bed elevated as ordered with the neck in a neutral position, avoiding unnecessary stimulation, and treating fever, pain and vomiting promptly. Compare every result with the previous one rather than judging each set of observations in isolation.

Worked scenario: interpreting a deteriorating neuro check

A hypothetical 19-year-old was briefly knocked out by a cricket ball to the temple, then chatted normally in the emergency department. Two hours later he is drowsy with a newly dilated right pupil. Options are continued hourly observation, documenting a likely concussion, or urgent escalation for possible epidural haematoma. Urgent escalation is correct.

Compare an 82-year-old on warfarin whose daughter reports three weeks of increasing forgetfulness after a minor fall. The likely concern is chronic subdural haematoma. Her priority is prompt reporting of the anticoagulant and fall history and close observation, not assuming the change reflects ageing.

Sources and further reading

MSD Manual Professional: Traumatic brain injury. Arterial versus venous source, CT shapes, chronic subdural in older and anticoagulated patients, herniation signs and Cushing triad.

MedlinePlus: Epidural hematoma. Arterial bleeding after skull fracture, younger patients, lucid interval and emergency surgery.

MedlinePlus: Subdural hematoma. Bridging vein tears, acute versus chronic forms, atrophy in older adults and anticoagulant and alcohol risk.