The origin of hypsarrhythmia and tonic spasms in West syndrome: Evidence from a case of porencephaly and hydrocephalus with focal hypsarrhythmia

Kazuhiroa Haginoya, Kimiya Kon, Soichiro Tanaka, Mitsutoshi Munakata, Rie Kato, Mayumi Nagai, Hiroyuki Yokoyama, Shin Maruoka, Tetsuro Yamazaki, Kazuie Iinuma

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

We report on a 3-year-old girl with West syndrome and with focal hypsarrhythmia. The left hemisphere of the patient was virtually completely defective and continuous hypsarrhythmia was only seen in the residual right frontal cortex, where an interictal single photon emission computed tomography (SPECT) showed hyperperfusion. Despite a focal epileptic pattern, the tonic spasms were quite symmetrical. In our patient, spasms might not require the sensorimotor cortex, but the brainstem containing the descending pathways that control spinal reflexes and other infratentorial structures seem to be essential for the occurrence of spasms. This is in accordance with the result of an ictal SPECT that showed hyperperfusion of the brainstem and cerebellum. These findings suggest that hypsarrhythmia originates from cortical lesions, while subcortical structures may be primarily responsible for the tonic spasms in this patient. Copyright (C) 1999 Elsevier Science Ireland Ltd.

Original languageEnglish
Pages (from-to)129-131
Number of pages3
JournalBrain and Development
Volume21
Issue number2
DOIs
Publication statusPublished - 1999 Mar 1

Keywords

  • Hypsarrhythmia
  • Infantile spasms
  • Single photon emission computed tomography
  • Tonic spasms
  • West syndrome

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Developmental Neuroscience
  • Clinical Neurology

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