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Interv Neurol. 2018 Apr;7(3-4):196-203. doi: 10.1159/000486515. Epub 2018 Feb 13.

Pomona Large Vessel Occlusion Screening Tool for Prehospital and Emergency Room Settings.

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Aurora Neuroscience Innovation Institute, Aurora St. Luke's Medical Center, Milwaukee, Wisconsin, USA.
Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas, USA.
Aurora Research Institute, Aurora Sinai Medical Center, Milwaukee, Wisconsin, USA.
Department of Neurosurgery, Baptist Medical Center, Jacksonville, Florida, USA.
Pomona Valley Hospital, Pomona, California, USA.
Department of Creative Arts, Faculty of Fine and Applied Arts, Chulalongkorn University, Bangkok, Thailand.
Department of Industrial Design, Faculty of Architecture, Chulalongkorn University, Bangkok, Thailand.
Department of Surgery, Kaiser Permanente Los Angeles Medical Center, Los Angeles, California, USA.
Asia Pacific Comprehensive Stroke Institute, Pomona, California, USA.



Early identification of patients with acute ischemic strokes due to large vessel occlusions (LVO) is critical. We propose a simple risk score model to predict LVO.


The proposed scale (Pomona Scale) ranges from 0 to 3 and includes 3 items: gaze deviation, expressive aphasia, and neglect. We reviewed a cohort of all acute stroke activation patients between February 2014 and January 2016. The predictive performance of the Pomona Scale was determined and compared with several National Institutes of Health Stroke Scale (NIHSS) cutoffs (≥4, ≥6, ≥8, and ≥10), the Los Angeles Motor Scale (LAMS), the Cincinnati Prehospital Stroke Severity (CPSS) scale, the Vision Aphasia and Neglect Scale (VAN), and the Prehospital Acute Stroke Severity Scale (PASS).


LVO was detected in 94 of 776 acute stroke activations (12%). A Pomona Scale ≥2 had comparable accuracy to predict LVO as the VAN and CPSS scales and higher accuracy than Pomona Scale ≥1, LAMS, PASS, and NIHSS. A Pomona Scale ≥2 had an accuracy (area under the curve) of 0.79, a sensitivity of 0.86, a specificity of 0.70, a positive predictive value of 0.71, and a negative predictive value of 0.97 for the detection of LVO. We also found that the presence of either neglect or gaze deviation alone had comparable accuracy of 0.79 as Pomona Scale ≥2 to detect LVO.


The Pomona Scale is a simple and accurate scale to predict LVO. In addition, the presence of either gaze deviation or neglect also suggests the possibility of LVO.


Acute stroke; Prehospital emergency care; Scales; Vessel occlusion

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