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Acute traumatic subdural hematoma often results from falls, violence, or motor vehicle accidents.

acute subdural hematoma whenever the patient has experienced moderately severe to severe blunt head
trauma. The clinical presentation depends on the location of the lesion and the rate at which it develops.
Often, patients are rendered comatose at the time of the injury. A subset of patients remain conscious;
others deteriorate in a delayed fashion as the hematoma expands.
Patients found to have an acute subdural hematoma are usually older than other patients with trauma. In
one study, the average age of a patient with trauma but without acute subdural hematoma was 26 years,
while the average age of patients with an acute subdural hematoma was 41 years. Therefore, older
patients appear to be at greater risk for developing an acute subdural hematoma after head injury. This is
believed to stem from older patients having more brain atrophy, which allows more shear force against
bridging veins immediately after impact.
Subacute subdural hematomas are defined arbitrarily as those that present between 4 and 21 days after
injury. Chronic subdural hematomas are arbitrarily defined as those hematomas presenting 21 days or
more after injury. These numbers are not absolute, and a more accurate classification of a subdural
hematoma usually is based on imaging characteristics.

Chronic subdural hematoma

One quarter to one half of patients with chronic subdural hematoma have no identifiable history of head
trauma. If a patient does have a history of head trauma, it is usually mild.
Of patients who have sustained head injury, symptoms develop after 1-4 weeks in 25%. Another 25%
experience symptoms from 5 weeks to 3 months before their hospital admission. Only one third of
patients have no asymptomatic period.
Clinical presentation for chronic subdural hematoma is often insidious, with symptoms that include the

Decreased level of consciousness

Difficulty with gait or balance
Cognitive dysfunction or memory loss
Personality change
Motor deficit (eg, hemiparesis)
Chronic subdural hematoma may have a presentation similar to that of Parkinson disease. [25, 26] An acute
presentation is also possible, as in the case of a patient who presents with a seizure.
Headache and confusion appear to be the most common presenting features, occurring in as many as
90% and 56% of cases, respectively. In 75% of cases, the headache had at least one of the following

Sudden onset
Severe pain
Accompanying nausea and vomiting
Exacerbation by coughing, straining, or exercise
Other common symptoms include weakness, seizures, and incontinence.
Hemiparesis and decreased level of consciousness are common, occurring in approximately 58% and
40%, respectively. Hemiparesis was ipsilateral to the hematoma in 40% of cases in one series. Gait
dysfunction is another common finding.
When signs of chronic subdural hematoma in different age groups are compared, somnolence, confusion,
and memory loss are significantly more common in elderly patients (aged 60-79 y). Signs of increased

intracranial pressure (ICP), such as headache and vomiting, are more likely to be seen in younger
patients. Fluctuating signs or symptoms occur in as many as 24% of cases.

Risk factors
Any degree or type of coagulopathy should heighten suspicion of subdural hematoma. Hemophiliacs can
develop subdural hematoma after seemingly trivial head trauma. An aggressive approach to diagnosis
and immediate correction of the factor deficiency to 100% activity is paramount.
Alcoholics are prone to thrombocytopenia, prolonged bleeding times, and blunt head trauma. Maintain a
high level of suspicion in this population. Promptly obtain a computed tomography (CT) scan of the head
when the degree of trauma is severe, focal neurologic signs are noted, or intoxication does not resolve as
anticipated. In alcoholics, more than any other cohort, acute or chronic subdural hematomas can be due
to the deadly combination of repetitive trauma and alcohol-associated coagulopathies.
Patients on anticoagulants can develop subdural hematoma with minimal trauma and warrant a lowered
threshold for obtaining a head CT scan.