Naser Mohamad karimi - Emergency medicine specialist, assistant professor Shahid sadoughi University of Medical Sciences, Emergency department, Yazd, Iran
Motahare Anvari - Emergency medicine specialist, assistant professor Shahid sadoughi University of Medical Sciences, Emergency department, Yazd, Iran
seyed Alireza Nezam al Hosseini - Emergency medicine specialist. Shahid sadoughi University of Medical Sciences, Emergency department, Yazd, Iran.
Ali Raee - Emergency medicine specialist, assistant professor Shahid sadoughi University of Medical Sciences, Emergency department, Yazd, Iran
Mohamadali Jafiari - Emergency medicine specialist, assistant professor Shahid sadoughi University of Medical Sciences, Emergency department, Yazd, Iran
Faeze Zeinali - Emergency medicine specialist. Shahid sadoughi University of Medical Sciences, Emergency department, Yazd, Iran

Background: Blunt abdominal trauma (BAT) has a high rate of morbidity and mortality. In the past few years, focused assessment with sonography in trauma (FAST) and computerized tomography (CT) scan have been extensively utilized and studied in management of BAT. The present study aims to compare the diagnostic accuracy of FAST and CT scan in detection of free fluid in BAT patients.Methods: In this cross-sectional study, patients with BAT were evaluated by both FAST and CT scans in Shahid Sadoughi Hospital, Yazd, Iran, from May ۲۰۱۷ to February ۲۰۱۸. The results were compared and the sensitivity, specificity, and accuracy of FAST and CT scan were calculated. In addition, the accuracy of FASTs performed by emergency medicine residents (EMR) was compared with those procedures performed by radiology residents (RR) in detecting abdominal free fluid following blunt trauma.Results: In this study, ۱۷۵ patients were participated and most of them were males. The commonest cause of trauma was a road traffic accident (RTA). When FAST was performed by EMRs, sensitivity was  ۹۶.۳%, specificity ۷۵%, ۶۰% positive  and ۹۸.۱% negative predictive values and ۹۴.۸% accuracy in true evaluating free fluid , and Sensitivity ۹۷.۵%, specificity ۸۳.۳%, ۷۱.۴%  positive and ۹۸.۸%  negative predictive values  when FAST was performed by RRs.Conclusion: Based on this study finding, it seems that FAST is highly sensitive, specific and accurate in the initial evaluation of patients with BAT.

Trauma, Abdominal Trauma, Blunt Trauma, CT Scan, FAST Exam, Focused Abdominal Sonography for Trauma