Indian Journal of PsychiatryIndian Journal of Psychiatry
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ORIGINAL ARTICLE
Year : 2014  |  Volume : 56  |  Issue : 1  |  Page : 61-66

Absent posterior alpha rhythm: An indirect indicator of seizure disorder?


Department of Psychiatry, Universal College of Medical Sciences, Bhairahawa, Nepal

Correspondence Address:
Tapas Kumar Aich
Department of Psychiatry, Universal College of Medical Sciences, Bhairahawa
Nepal
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0019-5545.124715

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Hypothesis: Absence of normal posterior alpha rhythm is an indirect indicator of seizure disorder. Materials and Methods: Study group consists of 116 child and adolescent patients in the age range of 5-17 years, with established history of seizure disorder. "Follow-up cases of seizure disorder" formed first comparison group, patients with a history of pseudo-seizures formed second comparison group and patients with a history of headache formed the third comparison group. Results: In significant 48.3% (56) patients within the study group there was no visible alpha rhythm. Whereas, this "absent alpha rhythm" criteria was seen in only 11.2% (4) patients in first and 15% (8) patients in second and in only 6.1% (2) patients in third comparison groups. Discussion: "Absent alpha rhythm"- a criterion seems to have a certain amount of "specificity" for electroencephalograms (EEGs) with seizure disorder patients. Presence of seizure activity and absence of alpha activity in EEG significantly correlated to each other (Significant at < 0.01 level). Absent alpha rhythm appears to be a "state marker" rather than a "trait marker" of seizure disorder.



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