Chronic Subdural Hematoma - Adult Management

Key Points

• Think of chronic SDH when an older adult develops progressive gait, cognitive, or focal neurologic change weeks after even minor trauma.
• CT may show hypodense, isodense, or mixed-density crescentic collections.
• Burr-hole evacuation with a closed drain is standard treatment for many symptomatic chronic SDHs.
• Small minimally symptomatic collections can sometimes be observed with close follow-up.
• Anticoagulation reversal and later restart require individualized risk balancing.
• Postoperative drainage reduces recurrence.
• Middle meningeal artery embolization is an evolving option for selected patients, especially recurrent or high-risk disease.

Algorithm

1. Obtain noncontrast head CT for compatible subacute neurologic symptoms or delayed post-fall decline.
2. Assess neurologic deficit, consciousness, mass effect, bilateral disease, and antithrombotic exposure.
3. Reverse or pause antithrombotic therapy when bleeding severity and surgical plan justify it.
4. Drain urgently when symptoms, progression, or mass effect are clinically significant.
5. Use closed postoperative drainage after burr-hole evacuation according to neurosurgical protocol.
6. Observe selected small stable collections with planned repeat imaging.
7. Evaluate recurrent or high-risk disease for repeat drainage, membrane surgery, or middle meningeal artery embolization.
8. Address fall risk and plan antithrombotic restart before discharge.

Clinical Synopsis & Reasoning

Chronic subdural hematoma develops over weeks after venous bleeding creates an inflammatory membrane that repeatedly leaks fluid and blood. Older age, cerebral atrophy, falls, alcohol use, anticoagulants, antiplatelet therapy, dialysis, and coagulopathy increase risk. The initial trauma may be trivial or forgotten. Symptoms are often subtle: progressive headache, gait instability, cognitive change, focal weakness, speech difficulty, urinary symptoms, or fluctuating alertness.

Noncontrast CT typically shows a crescentic hypo- or mixed-density collection. Mixed density can reflect recurrent acute bleeding into a chronic hematoma. Bilateral collections may produce less obvious midline shift despite significant mass effect. MRI is occasionally useful when CT is equivocal or alternative pathology is suspected. The neurologic examination and functional decline matter as much as maximal thickness.

Differentiate chronic SDH from ischemic stroke, tumor, normal-pressure hydrocephalus, dementia progression, and medication effects. A patient on anticoagulation with substantial symptomatic CSDH needs individualized reversal or interruption that balances expansion risk against the indication for anticoagulation. The decision to restart antithrombotic therapy later requires neurosurgical and prescribing-specialist coordination.

Treatment Strategy & Disposition

Urgent neurosurgical drainage is indicated for significant neurologic deficits, depressed consciousness, symptomatic mass effect, or radiographic progression. Burr-hole evacuation with placement of a closed subdural drain is the most common operation for liquefied chronic SDH. Twist-drill drainage can be used in selected patients, while craniotomy is reserved for organized, loculated, recurrent, or membrane-dominant disease.

Reverse anticoagulation for life-threatening or surgical hematoma using the agent-specific strategy. For stable small minimally symptomatic collections, close observation with serial examination and imaging may be reasonable. Corticosteroids are not routine first-line treatment because adverse effects and outcome tradeoffs limit their role. Antiseizure prophylaxis is not universally required in uncomplicated CSDH without seizures.

Recurrence after drainage is common enough that prevention matters. A postoperative subdural drain reduces recurrence compared with evacuation alone. Middle meningeal artery embolization has emerged as an adjunct or alternative in selected recurrent, high-surgical-risk, or treatment-specific cases and should be decided by an experienced multidisciplinary team. Address falls, alcohol exposure, blood-pressure control, and antithrombotic indication before discharge.

Epidemiology / Risk Factors

• Chronic SDH incidence rises sharply with age as cerebral atrophy increases bridging-vein vulnerability.
• Use of anticoagulants and antiplatelet agents contributes to a growing disease burden in older populations.
• Minor falls are common triggers but many patients recall no significant trauma.
• Recurrence after surgery is clinically important and has driven interest in adjunctive embolization.

Investigations

Recurrence Mitigation

Pharmacology

Prognosis / Complications

• Most symptomatic patients improve substantially after timely evacuation.
• Frailty, severe baseline cognitive impairment, bilateral disease, and recurrent bleeding can prolong recovery.
• Recurrence may require repeat surgery or an adjunctive endovascular strategy.
• Functional recovery includes gait, cognition, and strength and may continue for weeks after decompression.

Patient Education / Counseling

• Explain that chronic SDH can develop slowly after a minor injury and may recur even after successful drainage.
• Review fall-prevention measures and alcohol or sedating medication risks.
• Do not restart anticoagulants or antiplatelets independently after surgery.
• Seek urgent care for recurrent headache, confusion, weakness, speech difficulty, vomiting, seizure, or worsening balance.

Notes

Chronic subdural hematoma often masquerades as a medical or geriatric problem rather than a trauma problem. Slow cognitive decline, repeated falls, or unilateral weakness weeks after a minor injury deserves a low threshold for CT.

Recurrence prevention is now part of definitive management. Drain technique, antithrombotic planning, fall reduction, and selected middle meningeal artery embolization can all influence whether the patient returns with another collection.

After surgery, recurrence surveillance should be symptom driven as well as imaging based. A patient may develop recurrent gait instability or confusion before severe headache, particularly when collections are bilateral. Functional assessment by physical and occupational therapy can identify persistent fall risk that would otherwise recreate the original problem. Decisions about middle meningeal artery embolization are evolving as evidence expands; it may be used as an adjunct to surgery, for recurrent disease, or in selected patients at high operative risk, but local expertise and patient anatomy matter. It should not delay urgent decompression in a patient with significant mass effect and active neurologic deterioration.

References

1. Brain Trauma Foundation Surgical Management of Traumatic Brain Injury — Link
2. Neurocritical Care Society Neurocritical Care Guidelines — Link