Point-of-care ultrasonography is a standard part of trauma assessments, but there are no objective tools to assess proficiency and ensure high-quality examinations. Hand motion analysis (HMA) has been validated as a measure of surgical skill but has not previously been applied to ultrasonography. HMA was assessed for construct validity in Focused Assessment with Sonography for Trauma (FAST) performance.
Two cohorts of 12 expert and 12 novice ultrasonographers performed a FAST examination on a healthy volunteer. Hand motions were recorded with the trakSTAR 3D electromagnetic motion-tracking device (Ascension Technology) and analyzed using our custom-designed Motion Analysis and Recording System (MARS) software. Data were recorded at 240 Hz. Outcomes included time of examination, number of movements, and path length.
Time of examination was not different between cohorts (expert, 345.9 seconds; novice, 475.7 seconds; p = 0.12). Total path length of travel was shorter, and the number of discreet movements was less in the expert cohort for the left-hand (18.52 m vs. 28.01 m, p = 0.03, and 109.5 vs. 193.9, p = 0.027, respectively) and the right-hand performance (14.25 m vs. 32.09 m, p < 0.01, and 153.5 vs. 258.5, p = 0.03, respectively) versus the novice cohort. Both total path length traveled and total number of discreet movements were associated with expertise level in logistic regression modeling with areas under the receiver operating characteristic curves of 0.8269 and 0.8205, respectively.
This is the first study in the medical literature showing HMA as an objective, valid measure of FAST imaging performance. These objective, automated metrics can function as an adjunct measure to assess FAST performance as well as follow progress of and provide feedback to learners to improve future performances.
A “diagnostic criteria”–style test where the “diagnosis” is a determination of competence in a care provider, level II.
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From the Department of Surgery (M.T.Z., J.P., A.V., S.L., L.M.G.) University of Manitoba; Department of Medical Education (B.U.), University of Manitoba; Department of Emergency Medicine (C.P., D.K.), University of Manitoba; Department of Surgery (A.W.K.), University of Calgary, Canada.
Submitted: February 20, 2015, Revised: May 10, 2015, Accepted: June 9, 2015.
This work was presented as a poster at Trauma 2014: Trauma Association of Canada Annual Scientific Meeting, April 10–11, 2014, in Montreal, Quebec, Canada.
Supplemental digital content is available for this article. Direct URL citations appear in the printed text, and links to the digital files are provided in the HTML text of this article on the journal’s Web site (www.jtrauma.com).
Address for reprints: Markus T. Ziesmann, MD, MSc, 20 Seaside Dr, Winnipeg, Manitoba, R2J 3R7, Canada; email: firstname.lastname@example.org.