Ambulatory cassette EEG in clinical practice.

Area of Science:

• Neurology
• Neurophysiology

Background:

• Ambulatory cassette EEG (A/EEG) is a diagnostic tool for evaluating episodic neurological symptoms.
• Identifying epileptiform abnormalities and seizures is crucial for accurate diagnosis and treatment.

Purpose of the Study:

• To determine the diagnostic yield of A/EEG in a large patient cohort.
• To assess the prevalence of epileptiform abnormalities and seizures detected via A/EEG.

Main Methods:

• Retrospective review of 500 ambulatory cassette EEG (A/EEG) records.
• Analysis of detected epileptiform abnormalities and clinical seizures.

Main Results:

• Epileptiform abnormalities or seizures were detected in 17.4% (87/500) of patients.
• Abnormalities were found in 22 patients not taking anticonvulsant drugs.
• 1.5% of patients with syncope showed epileptiform abnormalities; none without episodic complaints did.
• 5.1% of patients referred by non-neurologic physicians had abnormalities.

Conclusions:

• A/EEG is valuable for detecting abnormalities suggestive of epilepsy, even in patients not on medication.
• The diagnostic utility of A/EEG is influenced by patient history and referring physician specialty.
• Discrepancies between clinical presentation and A/EEG findings necessitate careful interpretation.