Two-Year Outcomes and Interictal Burden After Treatment for Medication Overuse Headache

Area of Science:

• Neurology
• Headache Medicine

Background:

• Medication overuse headache (MOH) is a common secondary headache disorder, often stemming from migraine.
• The long-term interictal burden (impact between attacks) in MOH patients is not well understood.
• Effective treatment of MOH reduces headache frequency and medication overuse.

Purpose of the Study:

• To evaluate the interictal burden and clinical outcomes in patients two years after MOH diagnosis.
• To assess the prevalence of severe interictal burden using the Migraine Interictal Burden Scale (MIBS-4).

Main Methods:

• Prospective, multicenter cohort study of 149 MOH patients, with 117 completing two-year follow-up.
• Assessment of clinical characteristics, medication overuse, headache days, and standardized questionnaires at baseline and follow-up.
• Evaluation of interictal burden using the MIBS-4 scale at two years; scores ≥5 indicate severe burden.

Main Results:

• At two years, 21.4% of patients (25/117) reported severe interictal burden (MIBS-4 score ≥5).
• Patients with severe interictal burden showed greater headache impact (HIT-6, MIDAS) and psychological distress (PHQ-9, GAD-7) compared to those without.
• 14.4% of patients with resolved medication overuse still experienced severe interictal burden.

Conclusions:

• A significant proportion of MOH patients experience severe interictal burden two years after diagnosis.
• Severe interictal burden is linked to higher baseline disability and psychological distress.
• Long-term monitoring and management strategies are crucial for MOH patients, extending beyond initial medication withdrawal.