Neuroscience · Year 2 · from Neuroscience
Case 2: Juvenile Myoclonic Epilepsy
Patient Presentation
Demographics: 17-year-old female
Chief Complaint: "Jerking movements" in the morning and one "big seizure" last week
History of Present Illness: The patient reports that for the past 6 months, she has noticed brief "jerky" movements of her arms, usually occurring within an hour of waking up. She has spilled her cereal or dropped her toothbrush multiple times due to these sudden jerks. She thought this was normal or due to being tired. Last week, after staying up late studying for exams and drinking alcohol at a party, she had a generalized convulsion witnessed by her roommate. The roommate described whole-body stiffening followed by rhythmic shaking for about 2 minutes. She also reports occasional "spacing out" episodes lasting a few seconds where her friends say she stares blankly.
Triggers Identified:
- Sleep deprivation
- Alcohol consumption
- Both present before the generalized seizure
Physical Examination:
- Vital signs: Normal
- General: Healthy-appearing adolescent
- Neurological examination: Completely normal
Workup:
- Basic metabolic panel: Normal
- MRI brain: Normal
- EEG (with sleep deprivation): Generalized 4-5 Hz polyspike-and-wave discharges, most prominent in frontal leads; photic stimulation produced a photoparoxysmal response
Diagnosis: Juvenile myoclonic epilepsy (JME)
Seizure Types Present:
- Myoclonic seizures (morning jerks)
- Generalized tonic-clonic seizure
- Probable absence seizures (staring episodes)
Treatment:
- Valproate 250 mg twice daily, titrated to 500 mg twice daily
- Discussed alternatives (levetiracetam, lamotrigine) given teratogenicity concerns for future pregnancy
- Lifestyle counseling: avoid sleep deprivation, limit/avoid alcohol
- Driving restriction per state law
Clinical Course: Myoclonic jerks resolved within 2 weeks of reaching therapeutic valproate dose. No further generalized seizures occurred. At 6-month follow-up, she was seizure-free. She was counseled extensively that JME is a lifelong condition - if medication is stopped, seizures typically return. She was advised to discuss pregnancy planning with neurology given valproate's teratogenicity.
Clinical Pearl: Juvenile myoclonic epilepsy is the most common idiopathic generalized epilepsy syndrome. The classic presentation includes morning myoclonic jerks (the hallmark), generalized tonic-clonic seizures, and often absence seizures. Sleep deprivation and alcohol are powerful triggers. EEG shows generalized polyspike-and-wave complexes at 4-6 Hz. JME responds well to valproate (but valproate should be avoided in women of childbearing potential due to teratogenicity), lamotrigine, and levetiracetam. Unlike childhood absence epilepsy, JME is usually a lifelong condition requiring ongoing treatment.