Univercity, Main hospital, general Hospital,0pen

Inclusion Criteria:

1. Patients whose last attack occurred more than 1 month ago
2. Outpatients (including hospitalization for rehabilitation)
3. Japanese nationality
4. Patients who consented to participate in this study
5. Group I: Patients with dizziness, vertigo, presyncope, and light-headedness which are likely due to secondary chronic cerebral circulation impairment associated with sequelae of brain infarction, and patients for whom KETAS (IBUDILAST) was prescribed Group II: Patients without dizziness, vertigo, presyncope, and light-headedness which are likely due to chronic cerebral circulation impairment associated with sequelae of brain infarction

Exclusion Criteria:

1. Patients who cannot read, understand and fill in the questionnaire by themselves
2. Patients who idle their time away
3. Patients who are hospitalized
4. Patients who are undergoing treatment for dizziness, vertigo, presyncope, light-headedness which are likely due to chronic cerebral circulation impairment associated with sequelae of brain infarction
5. Patients whose dizziness, vertigo, presyncope, and light-headedness is definitely or likely caused by Meniere disease, vestibular neuronitis, benign paroxysmal positional vertigo, otitis media, or epilepsy6. Patients whom the investigator judges are not suitable to participate in the study