hypsarrhythmia /hyp·sar·rhyth·mia/ (hip″sah-rith´me-ah) an electroencephalographic abnormality commonly associated with jackknife seizures, with random, high-voltage slow waves and spikes spreading to all cortical areas.
hyp·sar·rhyth·mi·a or hyp·sa·rhyth·mi·a (h p s -r  m -)n. The abnormal and characteristically random electroencephalogram often found in babies with infantile spasms, associated with mental retardation. hyp sar·rhythmoid (-moid) adj. |
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