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Related Experiment Videos

Cortical changes to experimental sensitization of the human esophagus.

S A K Sami1, P Rössel, G Dimcevski

  • 1Center for Sensory-Motor Interactions, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.

Neuroscience
|April 25, 2006
PubMed
Summary

Esophageal sensitization alters brain responses to pain, causing neuroplastic changes in the cingulate gyrus. This highlights the brain region

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Area of Science:

  • Neuroscience
  • Gastroenterology
  • Pain Research

Background:

  • Neocortical organization exhibits experience-dependent plasticity.
  • Visceral pain perception involves complex central nervous system processing.
  • Understanding esophageal sensitization's central effects is crucial for pain management.

Purpose of the Study:

  • To investigate changes in electroencephalogram (EEG) evoked potentials and dipole source activity following experimental esophageal sensitization.
  • To determine if esophageal acid perfusion induces neuroplastic alterations in pain processing pathways.

Main Methods:

  • Healthy volunteers underwent endoscopic electrical esophageal stimulation at pain threshold.
  • EEG was recorded using 64 surface electrodes before and after esophageal acid perfusion (0.1 N HCl).

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  • Analysis included pain threshold, evoked potential topography, latency, and dipole source localization (opercular-insular and anterior cingulate cortex).

    • Main Results:

    • Esophageal sensitization decreased pain threshold and altered P1 (frontal/occipital) and P2 evoked potential latencies.
    • Source analysis revealed a latency reduction and posterior shift in anterior cingulate cortex dipole activity.
    • Consistent dipolar activity was observed in the opercular-insular cortex.

    Conclusions:

    • Short-term esophageal sensitization induces central neuroplastic changes, particularly in the cingulate gyrus.
    • These findings implicate the cingulate gyrus in visceral pain and hyperalgesia, relevant to functional gut disorders.
    • The study demonstrates a link between peripheral sensitization and central pain processing alterations.