Clonic (KLON-ik) seizures are rare and most commonly occur in babies. Most often, clonic movements are seen as part of a tonic-clonic seizure. Jerking movements alone, as with a clonic seizure, may last a few seconds to a minute.

2023年5月17日 · Clonic seizures cause rhythmic jerking and twitching of your muscles. They are most common in babies but can happen to anyone. A seizure is a sudden burst of electrical activity...

2025年2月1日 · A tonic-clonic seizure, previously known as a grand mal seizure, causes a loss of consciousness and violent muscle contractions. It's the type of seizure most people picture when they think about seizures. During a seizure, there's a burst of electrical activity in the brain that causes changes in behavior and movements.

Clonic seizures are characterized by repeated jerking movements of the arms and legs on one or both sides of the body, sometimes with numbness or tingling. If it is a focal (partial) seizure, the person may be aware of what’s happening. During a …

Tonic-clonic seizures can start in one or both sides of the brain. When they start in both sides of the brain, they are called generalized onset motor seizures or a generalized tonic-clonic seizure. Both terms mean the same thing.

Clonic seizures consist of rhythmic jerking movements of the arms and legs, sometimes on both sides of the body that can be seen by the person observing. Occasionally "jitteriness" in a young infant can be mistaken for a clonic seizure, especially if it is severe (during crying, for instance).

For generalized onset seizures: Motor symptoms may include sustained rhythmical jerking movements (clonic), muscles becoming weak or limp (atonic), muscles becoming tense or rigid (tonic), brief muscle twitching (myoclonus), or epileptic spasms (body flexes and extends repeatedly). Non-motor symptoms are usually called absence seizures.

2022年4月13日 · Tonic-clonic seizures, formerly known as “grand mal” seizures, are the most visible and recognized type of seizure. These involve uncontrolled convulsions and other muscle movements. They usually don’t last more than a few minutes, but often happen with epilepsy and sometimes cause severe problems and injuries.

2023年7月3日 · A generalized tonic-clonic seizure, formerly known as grand mal seizure, is defined as a seizure that has a tonic phase followed by clonic muscle contractions. Among patients, families, and observers, they are most feared of seizure types. They are usually associated with impaired awareness or complete loss of consciousness.

Tonic-clonic seizures, formerly known as grand mal seizures, comprise two stages: a tonic phase and a clonic phase. These intense seizures can be frightening to experience or observe, as extreme muscle spasms may temporarily arrest breathing.