Flow diagram of patients included in Ultrasound study Flow diagram of patients included in Ultrasound study. AA, abdominal aortic; FAST, Focused Assessment with Sonography for Trauma; HCMC, Hennepin County Medical Center; PM, paramedic; PO, physician overreader. Reprinted with permission from Heegaard W, Hildebrandt D, Spear D, Chason K, Nelson B, Ho J. Prehospital ultrasound by paramedics: results of field trial. Acad Emerg Med 17(6):624–630, 2010. Source: Chapter 4. Ultrasound in Prehospital and Austere Environments, Ma and Mateer's Emergency Ultrasound, 3e Citation: Ma O, Mateer JR, Reardon RF, Joing SA. Ma and Mateer's Emergency Ultrasound, 3e; 2014 Available at: http://accessemergencymedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/ma3/ma3_c004f003.png&sec=45957406&BookID=686&ChapterSecID=45956941&imagename= Accessed: November 06, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved