Management of Subdural Hematoma

Initial Assessment and Stabilization

The American College of Surgeons recommends securing the airway immediately with tracheal intubation and mechanical ventilation, monitoring end-tidal CO₂ from the pre-hospital period onward, to reduce mortality and improve functional outcomes in patients with subdural hematoma 1, 2, 3, 4
Maintaining PaCO₂ within normal range is crucial, as hypocapnia causes cerebral vasoconstriction and increases risk of brain ischemia, according to the American Heart Association 1, 3, 4
End-tidal CO₂ monitoring confirms correct tube placement and guides ventilation targets, as stated by the American Society of Anesthesiologists 1, 4
The American College of Emergency Physicians recommends maintaining systolic blood pressure >110 mmHg using vasopressors (phenylephrine or norepinephrine) without delay, to prevent hypotension and improve outcomes in patients with subdural hematoma 4
Even a single episode of hypotension (SBP <90 mmHg) significantly worsens neurological outcomes, according to the American Heart Association 4
The Society of Critical Care Medicine suggests using continuous infusions of sedatives rather than boluses to prevent hemodynamic instability in patients with subdural hematoma 1, 4

The American Association of Neurological Surgeons recommends surgical evacuation for acute subdural hematomas with thickness >5 mm and midline shift >5 mm, to reduce mortality and improve functional outcomes 1, 2, 5, 6
Standard craniotomy with hematoma evacuation remains the first-line surgical approach, as stated by the Congress of Neurological Surgeons 1, 2, 5, 6

The Neurocritical Care Society recommends monitoring ICP after subdural hematoma evacuation if ANY of the following are present: preoperative GCS motor response ≤5, preoperative anisocoria or bilateral mydriasis, preoperative hemodynamic instability, preoperative severity signs on imaging, intraoperative cerebral edema, or postoperative appearance of new intracranial lesions 7
Maintaining cerebral perfusion pressure (CPP) between 60-70 mmHg is crucial, as CPP <60 mmHg is associated with poor outcomes, according to the American Heart Association 7
The American Association of Neurological Surgeons suggests considering decompressive craniectomy for refractory intracranial hypertension in multidisciplinary discussion, particularly in patients <65-70 years 1, 2, 5, 3

The American College of Surgeons recommends conservative management for small hematomas without mass effect or neurological deterioration, with close neurological observation and serial imaging 3

The American Geriatrics Society recommends requiring careful monitoring in elderly patients, as small hematomas can expand rapidly, especially in those on anticoagulants 3

The American College of Emergency Physicians recommends avoiding delay in surgical intervention in symptomatic patients, as it leads to neurological deterioration and poorer outcomes 3
The Society of Critical Care Medicine suggests avoiding sedation boluses instead of continuous infusions, as it causes hemodynamic instability 4
The American Heart Association recommends avoiding hypocapnia, which induces cerebral vasoconstriction and brain ischemia 3, 4
The American College of Surgeons recommends avoiding even single episodes of hypotension (SBP <90 mmHg), which markedly worsens prognosis 4

Paracetamol (acetaminophen) should be administered first for headache and general pain in patients with subdural hematoma because it provides effective analgesia without antiplatelet activity or significant hemodynamic effects. 8
Non‑steroidal anti‑inflammatory drugs (NSAIDs) may be used as an alternative or adjunct to paracetamol, but clinicians must exercise caution in patients who may require surgical evacuation due to the drugs’ potential antiplatelet properties. 8

Opioid medications are indicated when paracetamol and NSAIDs fail to achieve adequate pain relief, particularly in cases of severe headache or after surgical evacuation of the hematoma. 8

In subdural hematoma that occurs secondary to spontaneous intracranial hypotension, the primary therapeutic focus should be repair of the cerebrospinal fluid leak (e.g., epidural blood patch), with analgesics used only as adjunctive symptom control. 8

After surgical evacuation, a multimodal regimen that includes scheduled paracetamol and opioids as needed should be continued, and any sedative agents should be delivered via continuous infusion to avoid spikes in intracranial pressure. 8
Clinicians must simultaneously assess pain control and neurological status, recognizing that uncontrolled pain can raise blood pressure and intracranial pressure, whereas excessive sedation may obscure neurologic deterioration. 9

NSAIDs should be avoided in patients being considered for surgical intervention or who have coagulopathy, because of the increased risk of peri‑operative bleeding; the decision must balance bleeding risk against the necessity for adequate analgesia. 8