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Decrease in haemoglobin oxygenation during absence seizures in adult humans.

Katharina Buchheim1, Hellmuth Obrig, Wolfram v Pannwitz

  • 1Neurologische Klinik und Poliklinik, Universitätsklinikum Charité, Medizinische Fakultät der Humboldt-Universität zu Berlin, Schumannstrasse 20/21, 10117 Berlin, Germany. katharina.buchheim@charite.de

Neuroscience Letters
|December 31, 2003
PubMed
Summary
This summary is machine-generated.

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Near-infrared spectroscopy (NIRS) reveals reduced cortical activity during absence seizures. This noninvasive method detected decreased oxygenated hemoglobin and increased deoxygenated hemoglobin, indicating a significant change in brain oxygenation.

Area of Science:

  • Neuroscience
  • Medical Imaging
  • Epilepsy Research

Background:

  • Near-infrared spectroscopy (NIRS) noninvasively measures cortical oxygenation changes during functional brain activity.
  • Increased oxygenated hemoglobin ([oxy-Hb]) and decreased deoxygenated hemoglobin ([deoxy-Hb]) indicate cortical activation.
  • Conversely, decreased [oxy-Hb] and increased [deoxy-Hb] suggest cortical deactivation.

Purpose of the Study:

  • To investigate cerebral oxygenation changes during absence seizures using NIRS.
  • To correlate NIRS findings with electroencephalography (EEG) and clinical seizure presentation.

Main Methods:

  • Simultaneous ictal NIRS and video-EEG telemetry were performed in three adult patients with typical absence seizures.
  • NIRS probes were positioned over the frontal cortex.

Related Experiment Videos

  • Cerebral hemoglobin oxygenation patterns were analyzed during seizure events.

    • Main Results:

    • Pronounced, reproducible changes in cerebral hemoglobin oxygenation were observed during absence seizures.
    • A consistent decrease in [oxy-Hb] and increase in [deoxy-Hb] were detected, indicating reduced cortical activity.
    • These oxygenation changes initiated seconds after EEG-defined seizure onset and persisted post-ictally.

    Conclusions:

    • Absence seizures are associated with a distinct pattern of reduced cortical activity, evidenced by decreased [oxy-Hb] and increased [deoxy-Hb].
    • NIRS is a valuable tool for assessing functional brain changes during absence seizures.
    • The observed oxygenation changes provide insights into the neurophysiology of absence epilepsy.