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First seizure and seizure mimics

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2 min synopsisUK scopeSources checked 27 Aug 2026Clinical review pending
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Escalate

A convulsive seizure lasting five minutes or more, recurrent seizures without recovery, persistent hypoglycaemia, ongoing impaired consciousness, pregnancy with possible eclampsia, meningism, acute focal deficit, major injury or cardiorespiratory compromise is a medical emergency requiring ABCDE care and the status or relevant acute pathway.

Synopsis

Stabilise a first suspected seizure, reconstruct the event from positive clinical evidence, identify provoked and cardiac causes, and arrange timely specialist testing without using a normal EEG to dismiss epilepsy.

  • The diagnosis rests first on a detailed account from the patient and witnesses, including before, during and after the event; obtain smartphone video when available and consent permits.
  • A first suspected seizure should prompt a 12-lead ECG because arrhythmia and convulsive syncope can closely resemble epilepsy and may carry immediate cardiac risk.
  • Check capillary glucose promptly and investigate sodium, calcium, infection, intoxication, withdrawal and other provoking factors according to the clinical context.

Key red flags

Generalised convulsive event

Abrupt loss of awareness followed by tonic stiffening and rhythmic bilateral clonic movements, with post-event confusion and muscle soreness, is strongly suggestive when witnessed as a coherent sequence.

Investigation priorities

01
Capillary glucose and targeted blood testsFirst step

Find reversible metabolic causes and assess consequences of a prolonged convulsion.

Management branches

ImmediateStabilise and identify provocation

A person presents during or soon after a first suspected seizure.

  1. 1. Protect from injury, use ABCDE, time the event, check glucose and oxygenation, and treat as status if convulsions reach five minutes or recovery fails.
  2. 2. Establish baseline cognition and repeat neurological examination after the postictal period, looking for trauma, meningism, pregnancy-related disease and persistent focal signs.
ReconstructDistinguish seizure from mimic

The person is stable enough for a detailed account.

Key medicines

Buccal midazolam for a prolonged convulsive seizureUse the person’s emergency plan where available; a common adult community rescue dose is 10 mg buccally, while hospital benzodiazepine choice and repeat timing follow the current status protocol.
Long-term antiseizure treatment after one unprovoked eventThere is no universal starter regimen; a specialist selects a seizure-appropriate medicine and titration when neurological deficit, unequivocal epileptiform EEG, structural abnormality or unacceptable recurrence risk supports treatment.
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Sources and review status4 sources · checked 27 Aug 2026 · clinical review pending
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom