• Danielle T Miller, Hashim Q Zaidi, Priyanka Sista, Sarah S Dhake, Matthew J Pirotte, Abra L Fant, and David H Salzman.
• Stanford University School of Medicine, Department of Emergency Medicine, Palo Alto, California.
• West J Emerg Med. 2020 Aug 24; 21 (5): 1258-1265.

IntroductionEmergency department thoracotomy (EDT) is a lifesaving procedure within the scope of practice of emergency physicians. Because EDT is infrequently performed, emergency medicine (EM) residents lack opportunities to develop procedural competency. There is no current mastery learning curriculum for residents to learn EDT. The purpose of this study was to develop and implement a simulation-based mastery learning curriculum to teach and assess EM residents' performance of the EDT.MethodsWe developed an EDT curriculum using a mastery learning framework. The minimum passing standard (MPS) for a previously developed 22-item checklist was determined using the Mastery Angoff approach. EM residents at a four-year academic EM residency program underwent baseline testing in performing an EDT on a simulation trainer. Performance was scored by two raters using the checklist. Learners then participated in a novel mastery learning EDT curriculum that included an educational video, hands-on instruction, and deliberate practice. After a three-month period, residents then completed initial post testing. Residents who did not meet the minimum passing standard after post testing participated in additional deliberate practice until mastery was obtained. Baseline and post-test scores, and time to completion of the procedure were compared with paired t-tests.ResultsOf 56 eligible EM residents, 54 completed baseline testing. Fifty-two residents completed post-testing until mastery was reached. The minimum passing standard was 91.1%, (21/22 items correct on the checklist). No participants met the MPS at the baseline assessment. After completion of the curriculum, all residents subsequently reached the MPS, with deliberate practice sessions not exceeding 40 minutes. Scores from baseline testing to post-testing significantly improved across all postgraduate years from a mean score of 10.2/22 to 21.4/22 (p <0.001). Mean time to complete the procedure improved from baseline testing (6 minutes [min] and 21 seconds [sec], interquartile range [IQR] = 4 min 54 sec - 7 min 51 sec) to post-testing (5 min 19 seconds, interquartile range 4 min 17sec - 6 min 15 sec; p = 0.001).ConclusionThis simulation-based mastery learning curriculum resulted in all residents performing an EDT at a level that met or exceeded the MPS with an overall decrease in time needed to perform the procedure.

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