Prospective Registry of Vertigo Due to Vertebrobasilar Transient Attacks.

The UTRAVERA (Unclassified Transient Vertiginous Attacks) study is a multicenter, prospective, observational cohort study designed in accordance with the SPIRIT 2025 Statement. The study aims to address diagnostic uncertainty in patients presenting to the emergency department with acute transient vertigo, dizziness, or unsteadiness lasting less than 24 hours, with no immediate evidence of stroke on neuroimaging. The study focuses on the spectrum of vertebrobasilar transient neurological attacks (VB-TNAs), a clinical construct that encompasses transient vestibular symptoms with or without associated brainstem manifestations, such as diplopia, dysarthria, ataxia, sensory disturbances, or bilateral visual symptoms. Initially, these episodes may be indistinguishable from vestibular migraine, atypical peripheral vestibular disorders, or other miscellaneous conditions, resulting in a diagnostic gray zone. Adult patients presenting with transient vertigo or dizziness are prospectively enrolled and undergo standardized otologic, neurological, cardiovascular, and imaging evaluations, including diffusion-weighted MRI and vascular imaging of the vertebrobasilar circulation. Based on baseline findings and longitudinal follow-up, patients are classified into diagnostic categories, including VB-TIA, migraine-like disorder, miscellaneous causes, or unclassified attacks. Follow-up assessments are performed at three and six months to evaluate diagnostic reclassification, symptom recurrence, treatment responses, and clinical outcomes. The study protocol does not mandate therapeutic interventions, which reflect standard clinical care, particularly antithrombotic strategies in patients suspected of VB-TIA. The primary objectives of the study are to describe the clinical characteristics of VB-TNAs, assess the accuracy of the initial diagnostic classification over time, evaluate therapeutic outcomes, and identify prognostic factors associated with adverse events.