ABSTRACT NUMBER: ESOC2026A1382 PREHOSPITAL PERFORMANCE OF FAST AND NIHSS IN ACUTE VERTIGO PATIENTS WITH SUSPECTED STROKE—SUBGROUP ANALYSIS FROM THE NORWEGIAN ACUTE STROKE PREHOSPITAL PROJECT (PARANASPP) TRIAL

Abstract Background and aims Acute vertigo in the prehospital setting is diagnostically challenging. Stroke screening tools primarly target anterior circulation strokes, but are also applied in identification of stroke among patients with acute vertigo. This study evaluated the diagnostic performance of FAST and NIHSS in prehospital suspected stroke patients presenting with acute vertigo. Methods Register-based post-hoc subgroup analysis of data from ParaNASPP, a stepped-wedge cluster-randomized trial at Oslo University Hospital implementing prehospital NIHSS, paramedic training and standardized communication. Patients with acute vertigo dispatched under suspected stroke criteria were included. Ambulance and hospital records were reviewed to compare baseline characteristics, symptoms, assess prehospital evaluation and reconstruct FAST and NIHSS scores between vertigo patients with and without stroke. Results Of 801 patients…