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Emergency And Acute Medicine - Epidural Hematoma
Fundamental Overview
An epidural hematoma results from direct trauma to the skull, where inward deformation of the calvarium causes separation of the dura from the inner skull surface and subsequent bleeding. The middle meningeal artery is responsible for more than half of cases, while meningeal venous bleeding accounts for approximately one third. Skull fractures are present in about 75% of patients, though they are less common in children.
More than half of patients have epidural hematoma as an isolated head injury, but it is frequently associated with subdural hematoma or cerebral contusion. On noncontrast CT imaging, the classic appearance is a lenticular (biconvex), unilateral collection, most often in the temporal region. The hematoma typically does not cross suture lines, though midline extension may occur.
Causation And Epidemiology
Epidural hematoma accounts for approximately 1.5% of traumatic brain injuries. The condition is more common in males, with a male-to-female ratio of about 3:1, and peak incidence occurs in the second and third decades of life. Motor vehicle collisions, assaults, and falls are the most frequent causes, with assault having the highest association with intracranial injury requiring neurosurgical intervention.
The condition is uncommon in very young children under five years of age and in elderly patients. Overall mortality is approximately 12% and is strongly correlated with the patient’s neurologic status prior to surgical intervention.
Pediatric-Specific Considerations
Head injury remains the leading cause of death and acquired disability in children. Falls and pedestrian or bicycle-related accidents are common mechanisms, while the most severe injuries are typically related to motor vehicle accidents. Nonaccidental trauma must always be considered.
Less than half of children with epidural hematoma present with altered consciousness. If epidural hematoma is part of the differential diagnosis, CT imaging is warranted regardless of mental status. Pediatric bleeding is more often venous in origin, and posterior fossa epidural hematomas occur more frequently than in adults. Children younger than five years generally have excellent outcomes, with recovery rates approaching 95%.
Clinical Manifestations
Patients often present with altered or progressively worsening level of consciousness. Approximately 85% experience loss of consciousness at some point during their clinical course, though only 11–30% demonstrate a classic lucid interval. Nausea and vomiting occur in roughly 40% of cases.
Unique Pediatric Presentations
In infants, the most notable sign may be a significant drop in hematocrit, sometimes as high as 40%. A bulging fontanelle accompanied by vomiting, seizures, or lethargy is highly suggestive. Fewer than half of pediatric patients lose consciousness at the time of injury.
Examination Findings
Ipsilateral pupillary dilation is seen in 20–40% of patients, most commonly on the same side as the hematoma. Hemiparesis occurs in more than one third of cases and is typically contralateral to the lesion.
Essential Diagnostic Priorities
Prompt neuroimaging is mandatory when epidural hematoma is suspected.
Diagnostic Studies And Interpretation
Laboratory evaluation may include arterial blood gas, complete blood count, serum chemistries, and coagulation studies, along with toxicology screening when appropriate.
Noncontrast CT of the head is the diagnostic modality of choice, typically revealing a smooth-bordered, biconvex hematoma. Mixed-density lesions suggest active bleeding. Temporal and parietal regions are most commonly involved. CT with bone windows is useful for detecting associated skull fractures. Additional imaging and trauma evaluation should be guided by clinical findings.
In infants with open fontanelles, ultrasound may be used as an adjunct diagnostic tool.
Conditions To Differentiate From
Recent head trauma strongly supports the diagnosis, though trauma may appear minor in infants and toddlers. Other considerations include subdural hematoma, cerebral concussion or contusion, intracerebral hemorrhage, diffuse axonal injury, subdural hygroma, abusive head trauma, and toxic, metabolic, or infectious etiologies.
Prehospital Management Principles
Patients with head injury demonstrate improved survival when transported to designated trauma centers. Spinal immobilization is essential, and adequate oxygenation must be ensured during transport. Airway protection and intubation may be required.
Initial Stabilization Approach
Avoidance of hypoxia and hypotension is critical. Rapid-sequence intubation is indicated for neurologic deterioration or signs of increased intracranial pressure. Controlled ventilation should target a PaCO₂ of 35–40 mm Hg, with hyperventilation reserved for impending herniation. Agents known to increase intracranial pressure should be avoided.
The head of the bed should be elevated 20–30 degrees after volume resuscitation. A rapid neurologic assessment including Glasgow Coma Scale scoring is required. Associated injuries are common and should be identified during secondary survey.
Emergency Department Interventions
Early neurosurgical intervention, ideally within four hours, significantly improves survival in comatose patients. Burr hole placement is often performed at the fracture site or ipsilateral to pupillary dilation, with craniectomy reserved for uncontrolled bleeding.
Conservative management in asymptomatic patients carries a high risk of deterioration, with more than 30% ultimately requiring surgery. Patients should be maintained euvolemic with isotonic fluids, and continuous end-tidal CO₂ monitoring is recommended. Arterial line placement and Foley catheterization facilitate close physiologic monitoring.
Intracranial pressure control includes adequate sedation, neuromuscular blockade when intubated, and osmotic therapy once euvolemia is achieved. Blood pressure and glucose control are essential, and seizure prophylaxis or treatment should be initiated. Steroids, prophylactic antibiotics, routine hyperventilation, and calcium channel blockers have not shown benefit.
Outcome Predictors
Poor prognosis is associated with age over 40 years, large or rapidly expanding hematomas, significant midline shift, low admission Glasgow Coma Scale score, prolonged pupillary asymmetry, elevated postoperative intracranial pressure, and associated brain or systemic injuries.
Medication Therapy
Commonly used agents include benzodiazepines for seizure control, antiepileptic drugs for prophylaxis, osmotic diuretics for intracranial pressure reduction, antihypertensives for blood pressure control, sedatives, neuromuscular blockers, and induction agents appropriate for neurocritical care. Hypertonic saline has shown benefit in selected pediatric patients.
Disposition And Monitoring
All patients with epidural hematoma or altered consciousness require admission to an intensive care setting with frequent neurologic assessments. Repeat CT imaging should be performed within 12–24 hours or sooner if clinical deterioration occurs. Patients at highest risk include those with skull fractures, rapid bleeding, low Glasgow Coma Scale scores, or focal neurologic deficits.
Discharge from the emergency department is not appropriate for patients with epidural hematoma.
Fundamental Overview
An epidural hematoma results from direct trauma to the skull, where inward deformation of the calvarium causes separation of the dura from the inner skull surface and subsequent bleeding. The middle meningeal artery is responsible for more than half of cases, while meningeal venous bleeding accounts for approximately one third. Skull fractures are present in about 75% of patients, though they are less common in children.
More than half of patients have epidural hematoma as an isolated head injury, but it is frequently associated with subdural hematoma or cerebral contusion. On noncontrast CT imaging, the classic appearance is a lenticular (biconvex), unilateral collection, most often in the temporal region. The hematoma typically does not cross suture lines, though midline extension may occur.
Causation And Epidemiology
Epidural hematoma accounts for approximately 1.5% of traumatic brain injuries. The condition is more common in males, with a male-to-female ratio of about 3:1, and peak incidence occurs in the second and third decades of life. Motor vehicle collisions, assaults, and falls are the most frequent causes, with assault having the highest association with intracranial injury requiring neurosurgical intervention.
The condition is uncommon in very young children under five years of age and in elderly patients. Overall mortality is approximately 12% and is strongly correlated with the patient’s neurologic status prior to surgical intervention.
Pediatric-Specific Considerations
Head injury remains the leading cause of death and acquired disability in children. Falls and pedestrian or bicycle-related accidents are common mechanisms, while the most severe injuries are typically related to motor vehicle accidents. Nonaccidental trauma must always be considered.
Less than half of children with epidural hematoma present with altered consciousness. If epidural hematoma is part of the differential diagnosis, CT imaging is warranted regardless of mental status. Pediatric bleeding is more often venous in origin, and posterior fossa epidural hematomas occur more frequently than in adults. Children younger than five years generally have excellent outcomes, with recovery rates approaching 95%.
Clinical Manifestations
Patients often present with altered or progressively worsening level of consciousness. Approximately 85% experience loss of consciousness at some point during their clinical course, though only 11–30% demonstrate a classic lucid interval. Nausea and vomiting occur in roughly 40% of cases.
Unique Pediatric Presentations
In infants, the most notable sign may be a significant drop in hematocrit, sometimes as high as 40%. A bulging fontanelle accompanied by vomiting, seizures, or lethargy is highly suggestive. Fewer than half of pediatric patients lose consciousness at the time of injury.
Examination Findings
Ipsilateral pupillary dilation is seen in 20–40% of patients, most commonly on the same side as the hematoma. Hemiparesis occurs in more than one third of cases and is typically contralateral to the lesion.
Essential Diagnostic Priorities
Prompt neuroimaging is mandatory when epidural hematoma is suspected.
Diagnostic Studies And Interpretation
Laboratory evaluation may include arterial blood gas, complete blood count, serum chemistries, and coagulation studies, along with toxicology screening when appropriate.
Noncontrast CT of the head is the diagnostic modality of choice, typically revealing a smooth-bordered, biconvex hematoma. Mixed-density lesions suggest active bleeding. Temporal and parietal regions are most commonly involved. CT with bone windows is useful for detecting associated skull fractures. Additional imaging and trauma evaluation should be guided by clinical findings.
In infants with open fontanelles, ultrasound may be used as an adjunct diagnostic tool.
Conditions To Differentiate From
Recent head trauma strongly supports the diagnosis, though trauma may appear minor in infants and toddlers. Other considerations include subdural hematoma, cerebral concussion or contusion, intracerebral hemorrhage, diffuse axonal injury, subdural hygroma, abusive head trauma, and toxic, metabolic, or infectious etiologies.
Prehospital Management Principles
Patients with head injury demonstrate improved survival when transported to designated trauma centers. Spinal immobilization is essential, and adequate oxygenation must be ensured during transport. Airway protection and intubation may be required.
Initial Stabilization Approach
Avoidance of hypoxia and hypotension is critical. Rapid-sequence intubation is indicated for neurologic deterioration or signs of increased intracranial pressure. Controlled ventilation should target a PaCO₂ of 35–40 mm Hg, with hyperventilation reserved for impending herniation. Agents known to increase intracranial pressure should be avoided.
The head of the bed should be elevated 20–30 degrees after volume resuscitation. A rapid neurologic assessment including Glasgow Coma Scale scoring is required. Associated injuries are common and should be identified during secondary survey.
Emergency Department Interventions
Early neurosurgical intervention, ideally within four hours, significantly improves survival in comatose patients. Burr hole placement is often performed at the fracture site or ipsilateral to pupillary dilation, with craniectomy reserved for uncontrolled bleeding.
Conservative management in asymptomatic patients carries a high risk of deterioration, with more than 30% ultimately requiring surgery. Patients should be maintained euvolemic with isotonic fluids, and continuous end-tidal CO₂ monitoring is recommended. Arterial line placement and Foley catheterization facilitate close physiologic monitoring.
Intracranial pressure control includes adequate sedation, neuromuscular blockade when intubated, and osmotic therapy once euvolemia is achieved. Blood pressure and glucose control are essential, and seizure prophylaxis or treatment should be initiated. Steroids, prophylactic antibiotics, routine hyperventilation, and calcium channel blockers have not shown benefit.
Outcome Predictors
Poor prognosis is associated with age over 40 years, large or rapidly expanding hematomas, significant midline shift, low admission Glasgow Coma Scale score, prolonged pupillary asymmetry, elevated postoperative intracranial pressure, and associated brain or systemic injuries.
Medication Therapy
Commonly used agents include benzodiazepines for seizure control, antiepileptic drugs for prophylaxis, osmotic diuretics for intracranial pressure reduction, antihypertensives for blood pressure control, sedatives, neuromuscular blockers, and induction agents appropriate for neurocritical care. Hypertonic saline has shown benefit in selected pediatric patients.
Disposition And Monitoring
All patients with epidural hematoma or altered consciousness require admission to an intensive care setting with frequent neurologic assessments. Repeat CT imaging should be performed within 12–24 hours or sooner if clinical deterioration occurs. Patients at highest risk include those with skull fractures, rapid bleeding, low Glasgow Coma Scale scores, or focal neurologic deficits.
Discharge from the emergency department is not appropriate for patients with epidural hematoma.
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