Definition

Noun: * A type of epilepsy characterized by a seizure where the person's muscles become stiff and rigid. This stiffness, or tonic phase, is the primary feature.

Usage

• The term is used specifically in medical contexts to describe and classify a particular seizure manifestation.
• It is often contrasted with other seizure types, such as "clonic epilepsy" (involving jerking movements) or "tonic-clonic epilepsy" (involving both stiffness and jerking).

Examples

• The patient's diagnosis was updated to tonic epilepsy after video EEG monitoring captured several episodes of sustained muscle rigidity without subsequent clonic activity.
• In tonic epilepsy, the seizures may cause the person to fall if they are standing when the muscle stiffness occurs.
• Treatment for tonic epilepsy often involves specific anti-seizure medications.

Advanced Usage

• Tonic phase: Refers specifically to the period of sustained muscle contraction during the seizure.
• The term is frequently used within the framework of the International League Against Epilepsy (ILAE) classification system for seizures and epilepsies.

Variants and Related Words

• Epilepsy (n): The broader neurological disorder characterized by a tendency for recurrent seizures.
• Seizure (n): A single occurrence of abnormal electrical activity in the brain.
• Tonic-clonic seizure (n): A generalized seizure that features both a tonic (stiffening) phase and a clonic (jerking) phase. This is a related but distinct term.
• Atonic seizure (n): A seizure characterized by a sudden loss of muscle tone (the opposite of tonic stiffness).

Synonyms

• Tonic seizure (when referring to the seizure event itself, though "tonic epilepsy" refers to the condition involving recurrent tonic seizures).

Related Terms (Not Phrasal Verbs or Idioms, but key medical terminology)

• Generalized epilepsy: A category of epilepsy where seizures begin simultaneously across both sides of the brain. Tonic seizures are often, but not always, generalized.
• Motor seizure: A seizure with prominent movement symptoms, such as stiffness or jerking.

Noun

1. epilepsy in which the body is rigid during the seizure