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The Dangers of Equivocal FAST in Trauma Resuscitation.
American Surgeon 2017 October 2
Equivocal focused abdominal sonography for trauma (FAST) examinations confound decision-making for trauma surgeons. We sought to determine whether the equivocal FAST (defined as any nonconcordant result) has a deleterious effect on trauma outcomes. A 2-year review (2014-2015) of all trauma activations at our Level I trauma center was performed. Patients were matched at baseline and FAST results were compared. Outcomes included resuscitation time (h), ventilation days (d), hospital length of stay (HLOS-d), ICU length-of-stay, and survival (%). In addition, skill level of the sonographer was stratified by novice (postgraduate year (PGY) years 1-3) or expert skill levels (PGY-4/fellow or attending). A total of 1,027 patients were included. Compared with concordant FAST examinations, equivocal FASTs were associated with increased HLOS (14.1 vs 10.6, P = 0.05), higher mortality (9.8 vs 3.7%, P = 0.02), decreased positive predictive value in the right upper quadrant (RUQ) (55 vs 79%, P = 0.02) and left upper quadrant (LUQ) (50 vs 83%, P < 0.01) and significantly decreased specificity in the thoracic (83 vs 98%), RUQ (80 vs 98%), LUQ (86 vs 99%), and pelvic (88 vs 98%) windows (P < 0.01 for all). A trend of greater positive predictive value in the thoracic window (100 vs 81%, P = 0.09) among PGY-4/fellow and attending providers compared with PGY levels 1-3 was observed. Equivocal FASTs portend worse outcomes than concordant FASTs because of high false-negative rates, specifically in the thoracic region and the upper quadrants. Lower thresholds for intervention are recommended.
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