Functional brain alterations in symptomatic dermographism patients-An exploratory magnetoencephalography study

Area of Science:

• Neurology
• Dermatology
• Immunology

Background:

• Symptomatic dermographism (SD) is a common urticaria type triggered by skin stroking.
• The role of brain involvement in SD etiology remains unclear.

Purpose of the Study:

• To investigate potential central nervous system (CNS) involvement in the etiology of symptomatic dermographism (SD).
• To explore brain activity patterns using magnetoencephalography (MEG) in SD patients compared to controls after specific provocations.

Main Methods:

• Twelve SD patients and fourteen controls underwent histamine skin prick tests and dermography.
• Magnetoencephalography (MEG) measured relative power and functional connectivity (FC) at baseline and post-provocation.
• Itch severity (VAS) and wheal size were recorded and correlated with MEG data.

Main Results:

• SD patients reported higher itch scores post-provocation.
• While no significant group differences in overall relative power or FC were found, both groups showed altered brain activity (beta power decrease, alpha power increase).
• Patients exhibited increased FC after histamine, controls after dermography; itch and wheal size correlated with alpha2 power in SD patients.

Conclusions:

• Findings suggest aberrant itch processing in SD, indicating potential CNS involvement.
• The study cautiously supports the hypothesis that central mechanisms contribute to the pathophysiology of symptomatic dermographism.