Atonic Seizures: Sudden Loss of Muscle Tone Causing Falls

Atonic seizures cause sudden loss of muscle tone — the person suddenly drops as if a rag doll. They're common in severe epilepsy syndromes like Lennox-Gastaut syndrome and carry high injury risk due to falls. Proper diagnosis and treatment are essential.

What are atonic seizures

Definition: sudden loss of muscle tone — person drops suddenly. Also called: drop attacks, akinetic seizures. Duration: very brief — seconds. Consciousness: usually preserved — person may be aware. Injury risk: high — falls cause head injuries, fractures. Frequency: may occur frequently — multiple per day. Syndromes: Lennox-Gastaut, Doose syndrome — common in severe epilepsy. EEG: shows slow spike-and-wave — diagnostic.

Recognizing atonic seizures

Sudden drop: person suddenly falls — no warning. No convulsion: no jerking movements — just loss of tone. Brief: lasts seconds — person recovers quickly. Preserved consciousness: person may be aware — can describe seizure. Multiple: may occur in clusters — frequent drops. Injury: falls cause injuries — head trauma common. Misdiagnosis: may be mistaken for fainting, syncope — EEG distinguishes.

Causes of atonic seizures

Lennox-Gastaut syndrome: severe childhood epilepsy — atonic seizures common. Doose syndrome: childhood epilepsy syndrome — atonic seizures prominent. Other severe epilepsies: various syndromes — atonic seizures may occur. Structural brain lesions: brain malformations, injuries — may cause atonic seizures. Metabolic disorders: rare — metabolic epilepsy syndromes. Unknown: no clear cause — cryptogenic.

Treatment of atonic seizures

First-line: valproate, lamotrigine, rufinamide — effective for atonic seizures. Ketogenic diet: effective for severe epilepsy — especially Lennox-Gastaut. VNS: vagus nerve stimulation — adjunct for refractory. Corpus callosotomy: surgical option — for severe cases. Safety: helmets, padding — prevent injury from falls. Medication combinations: may need multiple medications — individualized. Monitoring: frequent follow-up — severe epilepsy needs close monitoring.

When atonic seizures need specialist care

If you or your child has recurrent drop attacks, suspected atonic seizures, or seizures causing injuries — see a pediatric neurologist or epilepsy specialist immediately.

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When to seek professional evaluation

Atonic seizures are discussed at epilepsy evaluation — because severe epilepsy needs specialist management.

This guide is educational and does not replace individual medical advice.