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Decreased nociceptive flexion reflex threshold in chronic tension-type headache
M Langemark1, F W Bach, T S Jensen
1Department of Neurology, Gentofte Hospital, University of Copenhagen, Denmark.
Archives of Neurology
|October 1, 1993
Summary
Patients with chronic tension-type headache exhibit altered nociceptive processing, with a lower pain threshold and impaired descending inhibitory pathways. This suggests a potential dysfunction in the body's natural pain control system.
Area of Science:
- Neuroscience
- Pain Research
- Neurology
Background:
- Chronic tension-type headache (CTTH) is a prevalent neurological disorder.
- Understanding the underlying mechanisms of pain processing in CTTH is crucial for effective treatment.
- Nociceptive processing alterations may contribute to the pathophysiology of CTTH.
Purpose of the Study:
- To investigate nociceptive processing in individuals with CTTH.
- To compare pain perception and reflex responses between CTTH patients and healthy controls.
- To explore the role of descending inhibitory pathways in CTTH.
Main Methods:
- A survey assessed the nociceptive flexion reflex (NFR) threshold using sural nerve stimulation.
- Participants included 40 patients with CTTH and 29 age- and sex-matched healthy controls.
- Pain intensity was recorded using a visual analogue scale (VAS), and muscular response from the biceps femoris muscle.
Main Results:
- The median NFR threshold was significantly lower in the CTTH group (10 mA) compared to controls (20 mA).
- Pain tolerance thresholds were also significantly lower in CTTH patients.
- Steeper stimulus intensity/VAS pain rating response curves indicated heightened pain sensitivity in the CTTH group.
Conclusions:
- CTTH may involve a disorder of the endogenous antinociceptive system.
- A reduced descending inhibitory tone and altered recruitment of inhibitory systems are implicated.
- These findings suggest a neurobiological basis for altered pain processing in CTTH.