Structural brain changes in patients with persistent headache after COVID-19 resolution

Area of Science:

• Neuroimaging
• Neurology
• Infectious Disease Research

Background:

• Headache is a common persistent symptom following COVID-19 recovery.
• Understanding the neurological underpinnings of post-COVID headache is crucial.
• Distinguishing post-COVID headache from primary headache disorders like migraine is important.

Purpose of the Study:

• To investigate structural brain changes in patients with persistent headache post-COVID-19.
• To compare these changes with those in healthy controls and patients with episodic and chronic migraine.
• To explore whether post-COVID headache represents a distinct neurological state.

Main Methods:

• Utilized T1-weighted and diffusion-weighted MRI scans from 167 subjects.
• Assessed gray matter (cortical volume, thickness) and white matter (diffusion tensor imaging) parameters.
• Compared data from COVID-19 recovered patients with persistent headache (COV), healthy controls, episodic migraine, and chronic migraine patients.

Main Results:

• COV patients exhibited reduced cortical gray matter volume and thickness in specific brain regions compared to healthy controls.
• COV patients showed altered white matter integrity (lower fractional anisotropy, higher radial diffusivity) in the corpus callosum and left hemisphere versus controls.
• COV patients displayed distinct gray and white matter changes compared to migraine patients, suggesting a potentially intermediate neurological state.

Conclusions:

• Persistent headache following COVID-19 is associated with specific, albeit subtle, structural brain alterations.
• These changes differ from those observed in migraine, indicating post-COVID headache may be a unique condition.
• Findings suggest post-COVID headache could represent an intermediate neurological state between normality and migraine.