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  • Title: Coupling of focal electrical seizure discharges with infantile spasms: incidence during long-term monitoring in newly diagnosed patients.
    Author: Hrachovy RA, Frost JD, Glaze DG.
    Journal: J Clin Neurophysiol; 1994 Jul; 11(4):461-4. PubMed ID: 7962492.
    Abstract:
    To investigate the coupling of focal electrical seizure discharges (FS) and infantile spasms, we analyzed the video/polygraphic monitoring studies performed on 96 consecutive patients newly diagnosed with infantile spasms and hypsarrhythmic EEGs. A FS was considered to be coupled with infantile spasms if it occurred during a cluster of spasms (a series of individual spasms separated by < 1 min) or within 10 s of spasm onset or cessation. Ten patients demonstrated FS. In five patients (5% of the entire population) an apparent coupling of some FS with infantile spasms was observed during the baseline monitoring study. However, in three patients (only 3% of the entire population) was the observed coupling of FS and infantile spasms significant (p < 0.05). These results indicate that coupling of FS and infantile spasms occurs rarely, and that, in some instances, apparent couplings of FS and infantile spasms are best explained by chance coincidence. These findings do not support the hypothesis that the generation of infantile spasms at a subcortical level is dependent on a focal cortical discharge.
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