- hypsarrhythmia
- hyps·ar·rhyth·mia or hyps·arhyth·mia .hips-ā-'rith-mē-ə n an abnormal encephalogram that is characterized by slow waves of high voltage and a disorganized arrangement of spikes, occurs esp. in infants, and is indicative of a condition that leads to severe mental retardation if left untreatedhyps·ar·rhyth·mic or hyps·arhyth·mic -mik adj
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n.a severe abnormality on an EEG (see electroencephalography) that demonstrates a chaotic pattern of brain activity. It is usually characteristic of infantile spasms.* * *
hyp·sar·rhyth·mia (hip″sə-rithґme-ə) [hyps- + arrhythmia] an electroencephalographic abnormality sometimes observed in infants, with random, high-voltage slow waves and spikes that arise from multiple foci and spread to all cortical areas. It is seen most commonly in cases of jackknife seizures.
Medical dictionary. 2011.