Two forms of the 6/sec spike and wave complex.

Area of Science:

• Neurology
• Clinical Neurophysiology
• Epileptology

Background:

• 6/sec spike and wave complexes are a recognized EEG pattern.
• Understanding their electroclinical significance is crucial for diagnosis and management.

Purpose of the Study:

• To perform electroclinical correlations of 6/sec spike and wave complexes using computer analysis.
• To identify distinct patterns and their associations with specific patient demographics and symptoms.

Main Methods:

• Computer-analyzed electroclinical correlations were performed on 839 patients with 6/sec spike and wave complexes.
• Control groups included randomly selected EEGs, normal EEGs, slow wave abnormalities, and isolated spike abnormalities.
• Demographic data, symptoms (seizures, neurovegetative, psychological), and EEG characteristics (location, amplitude, state) were analyzed.

Main Results:

• The experimental group showed a peak age distribution of 11-15 years, with a higher prevalence of females and Caucasians.
• Major symptoms included seizures (53%), neurovegetative complaints (51%), and psychological complaints (24%), significantly differing from controls.
• Head injury was a common presumed etiology (>25%), with complexes maximal in anterior or occipital areas.
• Two forms were identified: WHAM (waking, high amplitude, anterior, males, seizures) and FOLD (drowsy, low amplitude, occipital, females, neurovegetative/psychological complaints).

Conclusions:

• 6/sec spike and wave complexes are associated with specific demographic and clinical profiles.
• The WHAM and FOLD forms represent distinct electroclinical entities with different symptom associations.
• These findings aid in understanding the heterogeneity of this EEG pattern and its clinical implications.