Complications of encephalitis
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Complications of encephalitis
Acute complications
- Raised intracranial pressure and cerebral edema - may lead to brain herniation.
- Seizures, including status epilepticus.
- Altered consciousness progressing to coma.
- Respiratory failure - due to reduced consciousness, loss of airway reflexes, or brainstem involvement; may require ventilation.
- Autonomic instability - fluctuating blood pressure, heart rate, temperature, and arrhythmias.
- Hyponatremia, often from syndrome of inappropriate antidiuretic hormone secretion (SIADH).
- Aspiration pneumonia, secondary bacterial infection, sepsis, and complications of prolonged ICU care.
- Focal neurologic deficits - hemiparesis, cranial-nerve palsies, ataxia, movement disorders, or acute flaccid paralysis depending on the cause and area involved.
- Death, particularly with severe herpes simplex, rabies, amoebic, or some arboviral encephalitides.
Long-term sequelae
- Epilepsy or recurrent seizures.
- Cognitive impairment - memory loss, poor attention, slowed thinking, impaired learning.
- Behavioral and psychiatric changes - personality change, irritability, depression, anxiety, psychosis, or emotional lability.
- Persistent motor disability - weakness, spasticity, poor coordination, tremor, dystonia, or parkinsonism.
- Speech, hearing, or visual impairment.
- Chronic fatigue and sleep disturbance.
- Loss of independence and need for rehabilitation or long-term care.
The likelihood and pattern of complications depend on the cause, age, delay to treatment, severity of impaired consciousness, and presence of seizures. Viral encephalitis survivors may have persistent physical, cognitive, and functional deficits, as described in CDC West Nile clinical guidance; some forms also cause major neuropsychiatric and seizure-related disability, as noted by the CDC Eastern equine encephalitis overview.
Red flags needing emergency management: seizure, worsening drowsiness or coma, new focal weakness, repeated vomiting, breathing difficulty, or signs of raised intracranial pressure.
In pediatric
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pediatric encephalitis complications neurologic sequelae children CDC
In children, encephalitis can cause both acute life-threatening problems and lasting neurodevelopmental effects.
Acute complications
- Seizures, including status epilepticus
- Raised intracranial pressure and cerebral edema, which may cause coma or herniation
- Altered consciousness, inability to protect the airway, aspiration, and respiratory failure
- Focal neurologic deficits: hemiparesis, cranial nerve palsy, ataxia, dystonia, tremor, or acute flaccid paralysis
- Autonomic dysfunction: unstable temperature, pulse, blood pressure, or arrhythmias
- SIADH with hyponatremia
- Secondary infections and ICU complications: aspiration pneumonia, sepsis, pressure injuries, venous thrombosis
- Death, especially with severe HSV encephalitis, rabies, amoebic encephalitis, and some arboviral infections
Long-term sequelae in children
- Epilepsy or recurrent seizures
- Developmental delay or regression, particularly in infants and young children
- Learning disability and reduced school performance
- Cognitive problems: impaired memory, attention, language, processing speed, and executive function
- Behavioral and psychiatric changes: irritability, aggression, emotional lability, sleep disturbance, anxiety, depression, psychosis, or autistic-like behaviors
- Motor impairment: persistent weakness, spasticity, poor balance, ataxia, tremor, dystonia, or cerebral palsy-like disability
- Speech, hearing, or visual deficits
- Feeding and swallowing difficulties
- Need for physiotherapy, occupational therapy, speech therapy, neuropsychological assessment, special educational support, or long-term care.
Children can appear physically recovered but later show learning, behavioral, language, or executive-function difficulties as academic demands increase. Follow-up should therefore include developmental and school-function review, not just a neurologic examination. The CDC notes that viral encephalitis-related neurologic complications in children may include seizures, acute cognitive/behavioral problems, focal deficits, and death in severe cases, as described in its influenza neurologic complications report.
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