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The electroencephalogram in acetazolamide-responsive periodic ataxia
M Y Neufeld1, P Nisipeanu, V Chistik
1Department of Neurology, Tel-Aviv Elias Sourasky Medical Center, Israel.
Summary
Acetazolamide-responsive periodic ataxia (ARPA) is a rare neurological disorder. EEG abnormalities are common but do not indicate epilepsy, and acetazolamide provides symptomatic relief.
Area of Science:
- Neurology
- Genetics
- Neurophysiology
Background:
- Acetazolamide-responsive periodic ataxia (ARPA) is a rare genetic movement disorder.
- Characterized by episodic vertigo, cerebellar ataxia, and nystagmus.
- Pathophysiology remains largely unknown, but is considered non-epileptic.
Observation:
- This study reports four new cases of ARPA (two familial, two sporadic).
- EEG findings were reviewed in 54 affected individuals from 18 kindreds and 9 sporadic cases.
- Abnormal EEGs were observed in 52% of cases.
Findings:
- The most frequent EEG abnormality was intermittent generalized slow activity (35%), often with spikes (10 cases).
- Nonspecific slowing was seen in 13%, and focal epileptic activity in 4%.
- Paroxysmal EEG activity in ARPA should not be misdiagnosed as epilepsy.
Implications:
- EEG findings, while not specific, can aid in diagnosing ARPA.
- Diagnosis of ARPA suggests treatment with acetazolamide for symptomatic relief.
- Understanding EEG patterns is crucial for accurate ARPA diagnosis and management.