Persistent headache attributed to past ischemic stroke: A prospective cohort study

Objective To assess the incidence, characteristics, and risk factors for developing persistent headache attributed to past ischemic stroke. Background Although the most recent International Classification of Headache Disorders has recognized the existence of persistent headache attributed to past ischemic stroke, there has been limited research in this area. Methods This was a prospective cohort study. We initially assessed patients hospitalized with ischemic stroke admitted within 72 h of symptom onset. All patients underwent diffusion‐weighted magnetic resonance imaging. These patients were re‐interviewed by telephone 1 year after the stroke. Semi‐structured questionnaires, the National Institutes of Health Stroke Scale (NIHSS), and six‐item Headache Impact Test were used. Results A total of 119 participants answered the interview conducted 1 year after the stroke. The mean (standard deviation) age was 64 (13.1) years, 82/119 (68.9%) were female, and the median (interquartile range) NIHSS score was 2 (1.0–4.0). The incidence rate of persistent headache attributed to past ischemic stroke was 12/119 (10.1%; 95% confidence interval [CI] 5.3–17.0%). The most frequent pattern presented was a migraine‐like pattern in seven of the 12 (58.3%) patients, which had a substantial/severe impact on five of the 12 (41.7%). For most patients this headache continued, although it began to improve. Previous migraine (odds ratio 7.1, 95% CI 1.06–50.0; p = 0.043) and headache intensity in the acute phase of stroke (odds ratio 1.75, 95% CI 1.13–2.7; p = 0.012) were associated with the occurrence of persistent headache attributed to past ischemic stroke. Conclusion Persistent headache attributed to past ischemic stroke is a frequent complication after stroke. It often has a significant impact on patients’ lives and presents a migraine‐like pattern as its most frequent phenotype.