Paroxysmal movement disorders are frequently misdiagnosed as focal epileptic seizures because both conditions present with intermittent, sudden-onset motor events. However, key clinical indicators can help distinguish between the two:
| Feature | Movement Disorder (e.g., PKD) | Seizure / Epilepsy |
| Consciousness | Preserved (No LOC) | Often impaired or altered |
| Interictal EEG | Normal | Frequently abnormal |
| Postictal Phase | Absent; instant recovery | Present (confusion, weakness) |
| Triggers | Specific (sudden startle/movement) | Usually unprovoked or specific reflex triggers |
Red Flags for Secondary Dyskinesia:
If the patient exhibits atypical features—such as onset under 1 year of age, prolonged attacks, or abnormal interictal neurological examination findings—further evaluation with brain MRI, metabolic screens, and EEG is essential to rule out secondary causes like multiple sclerosis, basal ganglia stroke, or metabolic derangements.
