Definition

Noun: * A specific historical disease: A form of encephalitis (inflammation of the brain) that was widespread (epidemic) in the early 20th century, particularly between 1915 and 1926. Its defining clinical features include paralysis of the muscles controlling eye movement and profound muscular weakness.

Usage

• The term is primarily used in a historical or medical context to describe this particular disease outbreak.
• It refers to a distinct clinical entity with specific symptoms, not a general term for any epidemic brain inflammation.

Examples

• Historical records from the 1920s document the devastating effects of epidemic encephalitis.
• The patient's ophthalmoplegia and severe lethargy were consistent with a diagnosis of epidemic encephalitis.
• Researchers studied the long-term neurological sequelae in survivors of epidemic encephalitis.

Advanced Usage

• The disease is also historically known as encephalitis lethargica or sleeping sickness (not to be confused with the tropical disease caused by trypanosomes).
• In medical literature, it is often discussed in the context of post-encephalitic parkinsonism, a condition that developed in some survivors.

Variants and Related Words

• Encephalitis lethargica (n): The more precise medical term for this condition, emphasizing the symptom of lethargy.
• Sleeping sickness (n): A historical colloquial name for the disease, referencing the symptom of extreme sleepiness or stupor.
• Encephalitis (n): The general term for inflammation of the brain, of which epidemic encephalitis is a specific type.

Synonyms

• Encephalitis lethargica (This is the direct synonym and more technical term).

Different Meanings

• Encephalitis: This is the broader category. Not all encephalitis is "epidemic encephalitis," which refers to one specific historical disease with a defined set of symptoms.
• Epidemic: This describes the widespread occurrence of a disease. An "epidemic" can refer to many diseases (e.g., an epidemic of influenza), not just this form of encephalitis.

Noun

1. an encephalitis that was epidemic between 1915 and 1926; symptoms include paralysis of the extrinsic eye muscle and extreme muscular weakness