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Objective: To describe differences in clinical and demographic characteristics between patients with episodic migraine (EM) or chronic migraine (CM) and determine the effect of migraine subtype on patient‐reported outcome measures (PROM). Background: Prior studies have characterized migraine in the general population. While this provides a basis for our understanding of migraine, we have less insight into the characteristics, comorbidities, and outcomes of migraine patients who present to subspecialty headache clinics. These patients represent a subset of the population that bears the greatest burden of migraine disability and are more representative of migraine patients who seek medical care. Valuable insights can be gained from a better understanding of CM and EM in this population. Methods: We conducted a retrospective observational cohort study of patients with CM or EM seen in the Cleveland Clinic Headache Center between January 2012 and June 2017. Demographics, clinical characteristics, and patient‐reported outcome measures (3‐Level European Quality of Life 5‐Dimension [EQ‐5D‐3L], Headache Impact Test‐6 [HIT‐6], Patient Health Questionnaire‐9 [PHQ‐9]) were compared between groups. Results: Eleven thousand thirty‐seven patients who had 29,032 visits were included. More CM patients reported being on disability 517/3652 (14.2%) than EM patients 249/4881 (5.1%) and had significantly worse mean HIT‐6 (67.3 ± 7.4 vs. 63.1 ± 7.4, p < 0.001) and median [interquartile range] EQ‐5D‐3L (0.77 [0.44–0.82] vs. 0.83 [0.77–1.00], p < 0.001), and PHQ‐9 (10 [6–16] vs. 5 [2–10], p < 0.001). Conclusions: There are multiple differences in demographic characteristics and comorbid conditions between patients with CM and EM. After adjustment for these factors, CM patients had higher PHQ‐9 scores, lower quality of life scores, greater disability, and greater work restrictions/unemployment. [ABSTRACT FROM AUTHOR]

Objectives: To compare clinical characteristics among outpatient headache clinic patients who do and do not self‐report visiting the emergency department for headache. Background: Headache is the fourth most common reason for emergency department visits, compromising 1%–3% of visits. Limited data exist about patients who are seen in an outpatient headache clinic but still opt to frequent the emergency department. Clinical characteristics may differ between patients who self‐report emergency department use and those who do not. Understanding these differences may help identify which patients are at greatest risk for emergency department overutilization. Methods: This observational cohort study included adults treated at the Cleveland Clinic Headache Center between October 12, 2015 and September 11, 2019, who completed self‐reported questionnaires. Associations between self‐reported emergency department utilization and demographics, clinical characteristics, and patient‐reported outcome measures (PROMs: Headache Impact Test [HIT‐6], headache days per month, current headache/face pain, Patient Health Questionnaire‐9 [PHQ‐9], Patient‐Reported Outcomes Measurement Information System [PROMIS] Global Health [GH]) were evaluated. Results: Of the 10,073 patients (mean age 44.7 ± 14.9, 78.1% [7872/10,073] female, 80.3% [8087/10,073] White patients) included in the study, 34.5% (3478/10,073) reported visiting the emergency department at least once during the study period. Characteristics significantly associated with self‐reported emergency department utilization included younger age (odds ratio = 0.81 [95% CI = 0.78–0.85] per decade), Black patients (vs. White patients) (1.47 [1.26–1.71]), Medicaid (vs. private insurance) (1.50 [1.29–1.74]), and worse area deprivation index (1.04 [1.02–1.07]). Additionally, worse PROMs were associated with greater odds of emergency department utilization: higher (worse) HIT‐6 (1.35 [1.30–1.41] per 5‐point increase), higher (worse) PHQ‐9 (1.14 [1.09–1.20] per 5‐point increase), and lower (worse) PROMIS‐GH Physical Health T‐scores (0.93 [0.88–0.97]) per 5‐point increase. Conclusion: Our study identified several characteristics associated with self‐reported emergency department utilization for headache. Worse PROM scores may be helpful in identifying which patients are at greater risk for utilizing the emergency department. [ABSTRACT FROM AUTHOR]