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Central pain processing in chronic tension-type headache.

Kim Lindelof1, Jens Ellrich, Rigmor Jensen

  • 1Danish Headache Center, Department of Neurology, Glostrup Hospital, University of Copenhagen, DK-2600 Glostrup, Denmark. Lindelof@dadlnet.dk

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|May 22, 2009
PubMed
Summary
This summary is machine-generated.

Chronic tension-type headache patients show increased sensitivity to pain stimuli. Their brainstem nociceptive processing, measured by the blink reflex, differs from healthy individuals, suggesting altered pain pathways in CTTH.

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Area of Science:

  • Neuroscience
  • Pain Research
  • Clinical Neurology

Background:

  • Chronic tension-type headache (CTTH) is prevalent, causing significant disability and healthcare costs.
  • Current understanding of CTTH mechanisms and treatment options remains limited.
  • The blink reflex (BR) offers insight into brainstem neuronal excitability and nociceptive processing.

Purpose of the Study:

  • To investigate brainstem nociceptive processing in an experimental pain model of CTTH.
  • To assess differences in blink reflex responses between CTTH patients and healthy controls under induced pain.

Main Methods:

  • Twenty CTTH patients and 20 healthy controls received a 5-minute infusion of hypertonic saline into neck muscles to induce conditioning pain.
  • The blink reflex was elicited using electrical stimuli at four times the pain threshold.
  • Pain sensitivity (pressure, electrical) and blink reflex integral were measured before, during, and after saline infusion.

Main Results:

  • CTTH patients reported significantly higher pain ratings for electrical stimuli and saline infusion compared to controls.
  • The blink reflex integral significantly decreased on the contralateral side in CTTH patients (-24.5%) versus controls (0.4%) after hypertonic saline infusion (p<0.05).
  • No significant difference in blink reflex integral was observed on the ipsilateral side between groups.

Conclusions:

  • While no robust difference in blink reflex integral was found after conditioning neck pain, CTTH patients exhibited heightened sensitivity to nociceptive stimuli.
  • A combined homotopic and heterotopic conditioning pain effect on the blink reflex may explain the observed findings.
  • These results suggest altered central pain processing in CTTH patients.