Thalamocortical Connectivity in Experimentally-Induced Migraine Attacks: A Pilot Study

Area of Science:

• Neuroscience
• Medical Imaging

Background:

• Migraine is a complex neurological disorder with poorly understood pathophysiology.
• Nitroglycerin (NTG)-induced headache is a translational model used to study migraine mechanisms in humans.

Purpose of the Study:

• To investigate functional brain changes during experimentally induced migraine attacks using functional magnetic resonance imaging (fMRI).
• To analyze static and dynamic functional connectivity (FC) alterations in migraine patients.

Main Methods:

• Utilized nitroglycerin (NTG) to induce migraine-like attacks in episodic migraine (EM) patients.
• Acquired task-free fMRI scans at baseline, prodromal, full-blown, and recovery phases.
• Applied seed-based correlation analysis (SCA) for static FC and wavelet coherence analysis (WCA) for dynamic FC, focusing on thalamic and salience network interactions.

Main Results:

• SCA revealed significant FC changes between the right thalamus and pain-related circuits (insula, pons, cerebellum) during prodromal and full-blown phases.
• WCA demonstrated a loss of synchronization between thalami and salience networks (SNs) during the prodromal and full-blown phases.
• FC alterations peaked during the full-blown migraine phase.

Conclusions:

• The study supports the hypothesis of temporal changes in thalamic function during NTG-induced migraine attacks.
• Findings highlight the dynamic nature of brain network alterations in migraine.
• Further validation in spontaneous migraine phases is needed to confirm the utility of this model.