Tuberous sclerosis: long-term follow-up and longitudinal electroencephalographic study

Area of Science:

• Neurology
• Clinical Neurophysiology

Background:

• Tuberous sclerosis (TS) is a genetic disorder affecting multiple organs, often leading to neurological complications.
• Electroencephalography (EEG) is frequently used to evaluate neurological dysfunction in TS patients.

Purpose of the Study:

• To analyze EEG patterns in patients with tuberous sclerosis.
• To determine if specific EEG findings correlate with clinical features or aid in TS diagnosis.

Main Methods:

• Analysis of 320 electroencephalograms (EEGs) from 60 patients diagnosed with tuberous sclerosis.
• Evaluation of background activity, specific discharge types (e.g., spike-wave, focal spikes), and amplitude asymmetries.
• Correlation of EEG findings with clinical data including seizure frequency and intellectual disability.

Main Results:

• Common EEG abnormalities included diffuse slowing, slow spike-wave discharges, focal/multifocal spikes, and amplitude asymmetries.
• No characteristic EEG pattern was identified for definitive TS diagnosis.
• Severe EEG abnormalities correlated with infantile spasms, frequent seizures, and severe mental retardation.
• Slow spike-wave discharges were less frequent in patients with mild intellectual disability and fewer seizures.
• EEG changes remained stable during follow-up.

Conclusions:

• While EEG reveals frequent abnormalities in tuberous sclerosis, no specific pattern serves as a diagnostic hallmark.
• EEG findings correlate with clinical severity, particularly in patients with significant neurological impairment.
• Pathological findings in TS did not explain the observed EEG abnormalities.