Subdural haematoma is a serious brain condition where blood collects between the protective layers covering the brain, often following a head injury. Treatment can range from careful observation to emergency surgery, depending on the size of the blood collection and how quickly symptoms develop. Even minor head injuries can sometimes lead to this condition, especially in older adults, making prompt medical attention vital for the best possible outcome.

When Every Moment Counts: Understanding Treatment Goals

Treating subdural haematoma focuses on several critical goals that can make the difference between recovery and lasting harm. The main aim is to relieve pressure on the brain that builds up as blood accumulates in the space between the protective membranes. This pressure can compress delicate brain tissue and interfere with normal brain function, so reducing it quickly becomes essential in many cases.^[1]

Another important goal involves preventing further bleeding and managing any complications that might arise. When bleeding occurs under the dura mater (the tough outer layer covering the brain), it creates a situation where brain tissue can be pushed against the skull. Treatment must address not only the blood that has already collected but also stop any ongoing bleeding to prevent the condition from worsening.^[2]

The approach to treatment depends heavily on how fast the haematoma developed and the patient’s overall condition. For acute subdural haematomas that appear within hours of injury, treatment must be swift and decisive. For chronic haematomas that develop slowly over weeks or months, there may be more time to carefully plan the best approach. Patient characteristics such as age, use of blood-thinning medications, and the presence of other health conditions all play a role in determining the most suitable treatment path.^[3]

Medical societies and expert groups have established standard treatments based on decades of clinical experience and research. These guidelines help doctors make informed decisions about when to operate, when to observe, and what additional therapies might be helpful. At the same time, research continues into new and innovative ways to treat subdural haematomas more effectively, with clinical trials exploring promising techniques that may improve outcomes for future patients.^[4]

Established Approaches: Standard Treatment Methods

The treatment of subdural haematoma begins with careful assessment. Doctors use imaging tests, particularly computed tomography (CT) scans, to see exactly where the blood has collected, how much blood is present, and how much pressure it is placing on the brain. These scans create detailed cross-sectional images that allow medical teams to make critical decisions about the next steps in care.^[1]

For patients with small haematomas that are not causing significant symptoms or brain compression, doctors may recommend a conservative approach. This means close monitoring without immediate surgery. The patient is admitted to hospital where healthcare teams can watch for any signs that the bleeding is worsening or that brain function is declining. Regular follow-up CT scans help track whether the blood collection is growing or beginning to resolve on its own. In some cases, especially with small bleeds, the body gradually absorbs the blood over several weeks without any surgical intervention needed.^[2]

When surgery becomes necessary, the most common procedure involves drilling small holes in the skull, called burr holes. Through these holes, surgeons can insert a tube to drain the collected blood. This is often the preferred method because it is less invasive than opening a large section of skull, allows for quicker recovery, and effectively relieves pressure on the brain. The burr hole approach has become the standard surgical treatment since the 1980s, replacing the more extensive craniotomy operations that were common before.^[2]

In more severe cases, particularly when there is a large amount of blood or solid blood clots that cannot be drained through small holes, surgeons may need to perform a craniotomy. This involves removing a section of the skull to access the subdural space directly. The surgeon can then remove the blood clot, control any active bleeding, and ensure that pressure on the brain is completely relieved. After the procedure, the bone is replaced and secured. While this is a more extensive operation, it is sometimes the only way to adequately treat large or complicated haematomas.^[4]

Managing brain pressure is another key component of standard treatment. When pressure inside the skull rises, it can damage brain tissue and create life-threatening complications. Doctors may use several strategies to control this pressure. These include elevating the head of the bed to help fluid drain away from the brain, administering medications called osmotic diuretics such as mannitol that help pull excess fluid out of brain tissue, and in severe cases, placing a patient on a ventilator with sedation to reduce the brain’s oxygen demands.^[13]

Medications play several important roles in treatment. Anti-seizure drugs may be given to prevent convulsions, which can occur when the brain is injured or irritated by blood. Seizures are a recognized complication of subdural haematoma and preventing them helps protect the brain from additional stress. Some guidelines recommend using anti-seizure medications for the first week after an acute subdural haematoma. Medications to control blood pressure are also critical, as high blood pressure can worsen bleeding or cause further injury to damaged blood vessels.^[14]

The duration of hospital treatment varies widely depending on the severity of the haematoma and how the patient responds to treatment. Some patients with small haematomas who are monitored without surgery may stay in hospital for several days to a week. Those who undergo surgery typically require longer hospital stays, often one to two weeks or more, especially if they need intensive care monitoring afterwards. Recovery can extend for weeks to months after discharge, with rehabilitation playing an important role for many patients.^[2]

Possible side effects and complications of treatment must be carefully weighed against the benefits. Surgery carries risks including infection, additional bleeding, stroke, and injury to blood vessels or brain tissue. Some patients experience persistent headaches, seizures, or neurological problems even after successful treatment. There is also a risk that the haematoma may return after being drained, requiring additional procedures. Despite these risks, for most patients with significant subdural haematomas, the benefits of treatment far outweigh the potential complications, as untreated haematomas can lead to permanent brain damage or death.^[5]

Exploring New Horizons: Treatment in Clinical Trials

Research into innovative treatments for subdural haematoma continues to advance, with several promising approaches being tested in clinical trials. One particularly interesting development involves a technique called middle meningeal artery embolization. This minimally invasive procedure works by blocking the blood supply to the membranes that line the subdural space. Doctors guide a thin tube called a catheter through blood vessels to reach the middle meningeal artery, which supplies blood to the dura mater and to the abnormal membranes that can form in chronic subdural haematomas. Once the catheter is in position, they release tiny particles that block blood flow to these areas, helping to stop the bleeding and prevent the haematoma from growing larger.^[12]

This embolization technique is being studied particularly for chronic subdural haematomas, which have a frustrating tendency to return even after successful drainage surgery. Early results from clinical trials have been encouraging, showing that patients who receive middle meningeal artery embolization in addition to traditional surgery may have lower recurrence rates. Some studies are also exploring whether embolization alone, without traditional surgery, might be effective for certain patients. This could offer a less invasive option for elderly patients or those with medical conditions that make surgery riskier.^[12]

The mechanism behind middle meningeal artery embolization is based on understanding how chronic subdural haematomas persist and regrow. When blood first collects in the subdural space, the body tries to wall it off by forming membranes. These membranes contain fragile new blood vessels that can leak, causing the haematoma to expand over time. By blocking the blood supply to these membranes, embolization may help them shrink and prevent ongoing bleeding. Researchers are working to identify which patients are most likely to benefit from this approach.^[12]

Another area of investigation involves medications that might help the body absorb subdural haematomas more quickly or prevent them from forming in the first place. Some clinical trials have looked at drugs called corticosteroids, which are anti-inflammatory medications. The theory is that reducing inflammation in the membranes surrounding the haematoma might speed healing and reduce the risk of the blood collection expanding. While results have been mixed, research continues to refine which patients might benefit from this medical approach and what doses might be most effective.^[14]

Researchers are also studying better ways to predict which subdural haematomas will resolve on their own and which will require surgery. This involves using advanced imaging techniques, including magnetic resonance imaging (MRI), to examine the characteristics of the haematoma in detail. MRI can reveal information about the age of the blood, the presence of membranes, and the likelihood of recurrence that CT scans cannot always show. Some trials are testing whether MRI findings can guide treatment decisions, potentially helping doctors avoid unnecessary surgery for haematomas likely to resolve spontaneously while ensuring timely intervention for those that pose greater risk.^[12]

Clinical trials examining different surgical techniques are ongoing as well. For instance, some studies compare using one burr hole versus two burr holes for drainage, or test whether leaving a drain in place for a longer period reduces recurrence rates. Others investigate modifications to surgical approaches, such as using endoscopes (small cameras) to guide drainage more precisely or exploring different positions for burr holes based on where the blood has collected.^[13]

Patient selection for these clinical trials typically involves specific criteria. Researchers often look for patients with chronic subdural haematomas because these tend to have higher recurrence rates and may benefit most from new approaches. However, some trials also include patients with acute haematomas to test whether early intervention with novel techniques can prevent complications. Eligibility may depend on factors such as age, overall health status, size and location of the haematoma, and whether the patient has had previous treatment for the condition.^[14]

Many of these research efforts are taking place at specialized neurosurgical centers around the world, including in Europe, North America, and Asia. The trials span different phases of investigation. Phase I studies focus primarily on safety, testing whether new treatments can be performed without causing unacceptable harm. Phase II trials examine whether the treatment shows promise in terms of effectiveness, looking at outcomes such as haematoma resolution rates, recurrence rates, and improvement in patient symptoms. Phase III studies compare new treatments directly against standard care to determine whether the innovation offers clear advantages.^[13]

Preliminary results from trials of middle meningeal artery embolization have shown encouraging safety profiles, with most patients tolerating the procedure well. Some studies report reductions in recurrence rates from around 20-30% with surgery alone down to 10-15% when embolization is added to treatment. Improvements in clinical outcomes, such as faster symptom resolution and shorter hospital stays, have also been observed in some trials, though more research is needed to confirm these benefits across larger patient populations.^[12]

Most common treatment methods

• Observation and monitoring
  • Used for small haematomas not causing significant symptoms or brain compression
  • Involves regular CT scans to track whether the blood collection is growing or resolving
  • Requires hospital admission for close neurological monitoring
  • May include medications to reduce brain swelling
  • Appropriate when haematoma is less than 10 millimeters thick and midline shift is minimal
• Burr hole drainage
  • The most commonly performed surgical procedure for subdural haematoma since the 1980s
  • Involves drilling one or two small holes in the skull
  • A tube is inserted through the holes to drain the collected blood
  • Often includes leaving a drain in place for 24-48 hours after surgery
  • Less invasive than craniotomy with shorter recovery time
• Craniotomy
  • Reserved for large haematomas or solid blood clots that cannot be drained through burr holes
  • Involves removing a section of skull to access the subdural space directly
  • Allows surgeon to remove clotted blood and control active bleeding
  • The bone is replaced and secured after the procedure
  • Required when there is significant brain compression or midline shift greater than 5 millimeters
• Medical management of intracranial pressure
  • Elevating the head of the bed to help fluid drain from the brain
  • Administering osmotic diuretics such as mannitol to reduce brain swelling
  • Using sedation and mechanical ventilation in severe cases to reduce brain oxygen demands
  • Controlling blood pressure to prevent further bleeding
  • Monitoring pressure inside the skull with specialized devices when necessary
• Reversal of anticoagulation
  • Critical for patients taking blood-thinning medications
  • May involve vitamin K for warfarin reversal
  • Specialized reversal agents for newer anticoagulants
  • Platelet transfusions for patients on antiplatelet medications
  • Helps stop ongoing bleeding and prevent haematoma expansion
• Seizure prevention
  • Anti-seizure medications often given for the first week after acute subdural haematoma
  • Common medications include phenytoin or levetiracetam
  • Helps prevent convulsions that could cause additional brain injury
  • May be continued longer in patients who develop seizures
• Middle meningeal artery embolization (in clinical trials)
  • Minimally invasive procedure that blocks blood supply to haematoma membranes
  • Involves guiding a catheter through blood vessels to the middle meningeal artery
  • Tiny particles are released to stop blood flow to abnormal membranes
  • Being studied particularly for chronic subdural haematomas with high recurrence risk
  • Early results suggest lower recurrence rates when combined with traditional surgery

The Road to Recovery: Rehabilitation and Long-term Care

Recovery from subdural haematoma is a journey that extends well beyond the initial treatment. Many patients, especially those with more severe haematomas, require comprehensive rehabilitation to regain lost functions and adapt to any permanent changes. The brain has remarkable capacity to heal and reorganize itself, but this process takes time and dedicated effort.^[2]

Physical therapy often forms a cornerstone of rehabilitation. A physiotherapist works with patients to address problems with movement, balance, and coordination that may result from brain injury. They design exercise programs tailored to each person’s specific needs, starting with simple movements and gradually progressing to more complex activities. For someone who has weakness on one side of the body, therapy might focus on strengthening that side and learning to move safely despite the weakness. Balance exercises help reduce the risk of falls, which is especially important because another head injury could be catastrophic.^[2]

Occupational therapy helps people relearn skills needed for daily living. An occupational therapist might work with a patient on tasks like getting dressed, preparing meals, managing medications, or returning to work activities. They also assess the home environment and suggest modifications to make it safer and more accessible. For example, they might recommend removing loose rugs that could cause tripping, installing grab bars in the bathroom, or rearranging furniture to create clear walking paths.^[2]

Speech and language therapy addresses difficulties with communication, swallowing, and eating that can occur after brain injury. A therapist works on exercises to strengthen the muscles used in speech, helps patients find alternative ways to communicate if speech is severely affected, and teaches strategies for safer swallowing to prevent food or liquid from going into the lungs. Some patients also need help with cognitive aspects of communication, such as organizing thoughts or finding the right words.^[2]

Follow-up medical care remains essential throughout recovery. Regular appointments allow doctors to monitor healing, watch for complications, and adjust treatment as needed. Repeat imaging scans may be performed to ensure the haematoma has not returned. Some patients need ongoing medication management, particularly if they developed seizures or if they need to resume blood-thinning medications cautiously after the risk of re-bleeding has passed. Discussions about when it is safe to return to driving, work, or sports activities are important parts of follow-up care.^[15]

Preventing future subdural haematomas is a critical consideration, especially for people who have already experienced one. Taking steps to prevent falls becomes paramount, particularly for older adults. This might include regular vision checks, reviewing medications that can cause dizziness, wearing appropriate footwear, using assistive devices like canes or walkers when needed, and making home modifications to reduce hazards. For younger people, using proper safety equipment during sports and activities, always wearing seatbelts in vehicles, and wearing helmets when cycling or motorcycling can significantly reduce the risk of head injury.^[5]

The overall prognosis varies considerably depending on factors such as the patient’s age, the size and type of haematoma, how quickly treatment was received, and whether there was underlying brain injury. Acute subdural haematomas, which occur with severe head trauma, unfortunately have higher mortality rates even with prompt treatment. Chronic subdural haematomas generally have better outcomes, with many patients making good recoveries, especially when treated before severe symptoms develop. Some individuals do experience lasting problems such as persistent headaches, memory difficulties, personality changes, or an increased risk of seizures.^[14]