The Epilepsy PathwayFrom "was that a seizure?" to a working diagnosis, a seizure type, and a first medication — organized the way the ILAE framework asks you to think.

Most misdiagnosed "epilepsy" is something else entirely. Before you ever classify a seizure, decide whether the paroxysmal event was epileptic at all. The two big pretenders are syncope and psychogenic non-epileptic events.

The single most useful tool here is a careful witnessed history — a phone video of the event is worth more than any test you can order in clinic. Anchor the interview on what happened before, during, and after.

A single seizure is not epilepsy. The ILAE gives a practical, operational definition — and, importantly, an updated one that lets you diagnose epilepsy after a first unprovoked seizure when recurrence risk is high.

The ILAE 2014 operational definition

Epilepsy is a disease of the brain defined by any one of the following three conditions:

Provoked vs. unprovoked — this changes everything

An acute symptomatic (provoked) seizure occurs in close temporal relationship to an acute insult and does not by itself indicate epilepsy. Treat the cause, not the "epilepsy." Common provokers:

• Metabolic: hyponatremia (<115), hypoglycemia, hypocalcemia, uremia, hepatic failure.
• Toxic / withdrawal: alcohol withdrawal (classically 6–48 h), benzodiazepine withdrawal, cocaine, bupropion, tramadol.
• Acute brain insult within ~7 days: stroke, trauma, CNS infection, hypoxic-ischemic injury.
• Fever in a young child meeting febrile seizure criteria.

The minimum first-seizure workup

The ILAE 2017 framework classifies at three levels: seizure type → epilepsy type → syndrome. Everything starts with one question that colors the rest of the workup: where did the seizure begin?

The three onset categories

Interactive classifier

Work through the same questions you'd ask a witness. This walks the ILAE branch points and lands on a seizure-type label. It is a teaching aid, not a diagnosis.

Once you know the seizure type(s), the epilepsy type usually follows. The 2017 framework adds a category most primary-care neurologists under-use: combined generalized and focal epilepsy.

Common syndromes worth recognizing on sight

A syndrome bundles seizure type(s), age of onset, EEG signature, and prognosis into a package that often dictates drug choice directly.

Epilepsy is a network disorder, and the same network that generates the seizures also shapes cognition, mood and behaviour. That is why the "traits" cluster by type. But group-level tendencies are not verdicts about a person — read this as clinical texture, not a personality horoscope.

Comorbidity is the rule, not the exception

Across all epilepsy types, the biggest driver of quality of life is often not the seizures but the company they keep. The relationship is bidirectional — depression, for instance, is both more common after epilepsy begins and an independent risk factor for developing it — which points to shared underlying biology rather than a simple reaction to diagnosis.

Type-specific profiles

These are the characteristic textures each classification tends to carry. Every card describes a tendency at the group level — many individuals show none of it.

Before you call it a "trait" — check the drug

A large share of what looks like personality is iatrogenic and reversible. Anti-seizure medications have their own behavioural fingerprints; changing the agent can change the "trait".

The EEG doesn't diagnose epilepsy on its own, but a handful of interictal patterns are strongly tied to specific classifications. This viewer animates the waveform morphology behind the words in your report.

Drug choice follows classification, then gets tuned to the person — age, sex and pregnancy potential, comorbidities, other medications. Pick a rational agent, start low, titrate slowly, aim for monotherapy at the lowest effective dose.

Broad- vs. narrow-spectrum: the mental model

A convulsive seizure lasting ≥5 minutes, or repeated seizures without recovery of awareness between them, is status epilepticus. This is a neurological emergency where the algorithm is a clock, not a decision tree.

Primary-care neurology handles the common, well-classified epilepsies. These situations should route to epileptology, video-EEG monitoring, or a comprehensive epilepsy center.

A reproducible classifier, in code

The onset-first logic above expressed as a small GNU Octave function — a compact way to encode the branch points so the reasoning is explicit and testable rather than implicit.

% classify_seizure.m — teaching model of the ILAE 2017 onset-first branch
% Inputs are strings; returns a seizure-type label. Educational only.
function label = classify_seizure(onset, awareness, feature)
  onset     = lower(onset);      % 'focal' | 'generalized' | 'unknown'
  awareness = lower(awareness);  % 'aware' | 'impaired' | 'na'
  feature   = lower(feature);    % 'motor' | 'nonmotor' | 'tonicclonic' | 'absence' | 'myoclonic'

  switch onset
    case 'focal'
      aw = 'aware';
      if strcmp(awareness,'impaired'), aw = 'impaired awareness'; end
      label = sprintf('Focal %s, %s onset', aw, feature);
      if strcmp(feature,'tonicclonic')
        label = 'Focal to bilateral tonic-clonic';
      end
    case 'generalized'
      switch feature
        case 'absence',     label = 'Generalized non-motor (absence)';
        case 'myoclonic',   label = 'Generalized motor: myoclonic';
        case 'tonicclonic', label = 'Generalized motor: tonic-clonic';
        otherwise,          label = 'Generalized motor (specify)';
      end
    otherwise
      label = sprintf('Unknown-onset %s', feature);
  end
endfunction

% >> classify_seizure('focal','impaired','motor')
% ans = Focal impaired awareness, motor onset
% >> classify_seizure('generalized','na','absence')
% ans = Generalized non-motor (absence)