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Academic Medicine:
doi: 10.1097/ACM.0b013e31827bfc0a
Research Reports

Making July Safer: Simulation-Based Mastery Learning During Intern Boot Camp

Cohen, Elaine R. MEd; Barsuk, Jeffrey H. MD, MS; Moazed, Farzad MD; Caprio, Timothy MD; Didwania, Aashish MD; McGaghie, William C. PhD; Wayne, Diane B. MD

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Author Information

Ms. Cohen is research assistant, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

Dr. Barsuk is associate professor of medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

Dr. Moazed is chief medical resident, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

Dr. Caprio is a third-year internal medicine resident, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

Dr. Didwania is assistant professor of medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

Dr. McGaghie is Jacob R. Suker, MD, Professor of Medical Education, Center for Education in Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

Dr. Wayne is Dr. John Sherman Appleman Professor of Medicine and vice chair, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

First published online December 23, 2012

Correspondence should be addressed to Dr. Wayne, Department of Medicine, 251 East Huron St., Galter Suite 3-150, Chicago, IL 60611; telephone: (312) 926-4227; fax: (312) 926-6905; e-mail: dwayne@northwestern.edu.

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Abstract

Purpose: Patient care quality worsens during academic year turnover. Incoming interns’ uneven clinical skills likely contribute to this phenomenon, known as the “July effect.” The aim of this study was to evaluate the impact of a simulation-based mastery learning (SBML) boot camp on internal medicine interns’ clinical skills.

Method: This was a cohort study of an SBML intervention at Northwestern University. In 2011, 47 interns completed boot camp; 109 interns (from 2009 and 2010) who did not participate in boot camp were historical controls. Boot-camp-trained interns participated in three days of small-group teaching sessions, deliberate practice, and individualized feedback. Primary outcome measures were performance of boot-camp-trained interns and historical controls on five parts of a clinical skills examination (CSE). Assessments included recognition of physical examination findings (cardiac auscultation), performance of procedures (paracentesis and lumbar puncture), management of critically ill patients (intensive care unit skills), and communication with patients (code status discussion). Boot camp participants were required to meet or exceed a minimum passing standard (MPS) before beginning their internship.

Results: Boot-camp-trained interns all eventually met or exceeded the MPS and performed significantly better than historical control interns on all skills (P < .01), even after controlling for age, gender, and USMLE Step 1 and 2 scores (P < .001). The authors detected no relationship between CSE scores and age, gender, prior experience, self-confidence, or USMLE Step 1 and 2 scores.

Conclusions: An SBML boot camp allows for individualized training, assessment, and documentation of competence before interns begin providing medical care.

Teaching hospitals worldwide experience the “July effect,” defined as decreased health care efficiency and increased patient morbidity and mortality during the month of July.1–5 Researchers postulate that academic year-end turnover and interns’ unfamiliarity with a new work environment are major reasons for these findings.1–5 Uneven baseline clinical skills of recent medical school graduates may also contribute to the July effect. Several studies from the University of Michigan and Michigan State University reveal gaps in new interns’ knowledge and skills in such tasks as maintaining aseptic technique and obtaining informed consent.6,7 All interns complete prior clinical experience through their undergraduate medical education; however, completing early clinical training is not a guarantee of clinical competence, and deficiencies measured at the beginning of internship often persist in future training years.7

Medical educators have noted this gap between expected and actual skills, and they have called for a rigorous intern orientation for many years.8–10 One proposed solution for the July effect is the use of simulation-based education with rigorous, competency-based outcome measurement.9,11 Research has shown that simulation-based education improves learning and patient care outcomes in clinical skills such as laparoscopic surgery,12,13 central venous catheter insertion,14 colonoscopy,15 obstetrical emergency management,16 and advanced cardiac life support.17 Simulation has also been used in medical student boot camp experiences to provide trainees with short-duration, high-intensity training meant to improve their confidence,18,19 enhance their skills,20–22 and ease their transition to residency.19 Educators have also used the boot camp model for surgical interns, but the effectiveness of this approach is unknown because most studies have focused on a narrow range of basic skills such as instrument identification, knot tying, suturing, and wound closure.23–26 Outcome measures of surgical boot camps have largely been limited to course participants’ satisfaction and self-confidence rather than to rigorous assessment of their clinical skills, although some studies have shown short-term improvement in core technical skills.23–26 One recent study linked boot camp assessments to evaluations from faculty and in-service scores. In this study, interns underwent training in procedural skills and patient care scenarios using simulation technology. Individual simulation-based performance scores correlated with subsequent clinical and core curriculum evaluations for the remainder of the intern year. These findings support the validity of the boot camp approach for resident competency evaluation.27

Providing high-quality clinical care within training programs requires assurance that all interns have mastered basic clinical skills before assuming patient care responsibilities. Mastery learning is a form of competency-based education in which skills are measured rigorously against high achievement standards. Educational outcomes are uniform, whereas educational time varies among trainees.28 Simulation-based mastery learning (SBML) is a powerful tool that can help boost residents’ clinical skills to high levels, improve patient care quality and outcomes,14,17,29 and reduce hospital costs.30 Applying the mastery model to intern orientation helps ensure that all interns meet a minimum performance standard before they complete their orientation and start their clinical training with patients. Educators have not yet conducted in-depth studies of the use of the mastery model for incoming interns because there are no universal accepted minimum standards for the clinical skills needed to graduate from medical school.

We developed an SBML internal medicine intern boot camp curriculum that covers a range of clinical skills needed to provide safe patient care including physical examination and procedural skills, managing critically ill patients, and communicating with patients. The aim of this study was to evaluate the impact of SBML during intern boot camp on the clinical skills of new trainees.

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Method

Study design

This was a cohort study of a boot camp educational intervention designed to increase interns’ clinical skills. Previous cohorts of interns who completed the same clinical skills examinations (CSEs) without the boot camp curriculum served as historical controls.

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Procedure

We conducted this study in the Northwestern University Division of Hospital Medicine Simulation Center and the Northwestern University Simulation Technology and Immersive Learning facility. All 47 incoming internal medicine interns in June 2011 at Northwestern University were eligible to participate in the study. The comparison group consisted of 109 interns from two prior training years (2009 and 2010) who were assessed but did not participate in boot camp. All trainees in this program undergo clinical training at Northwestern Memorial Hospital (NMH), a tertiary care urban teaching hospital, and the Jesse Brown Veteran’s Affairs Medical Center.

We asked 2011 interns to report three days early to NMH so that they could participate in boot camp as an addition to the standard medical center orientation. NMH provided the salary support for the interns during this time. We told boot camp participants that we would provide small-group education followed by rigorous individual performance assessment of each skill. The Northwestern University institutional review board approved the study, and all 47 interns provided informed consent before participation.

Boot camp trainees received a standardized intervention and evaluation for each competency and skill. The educational intervention consisted of three days (24 total hours) of small-group teaching sessions and individualized feedback and assessment. Interns rotated in groups of six through five scenarios covering the following skills: (1) cardiac auscultation, (2) paracentesis, (3) lumbar puncture (LP), (4) intensive care unit (ICU) clinical skills, and (5) code status discussion. We selected these skills on the basis of feedback from historical control interns and program faculty. Program faculty had reported that these particular skills were frequently inadequate in historical control interns. Further, these scenarios represent a range of core competencies (patient care, medical knowledge, communication, and interpersonal skills) and patient care skills that internal medicine interns require during residency.

Teaching sessions lasted two to four hours and included both didactic content and the opportunity for simulation-based deliberate skills practice with individualized feedback, which research has shown to be a key component of clinical skill mastery in medicine and its related domains.31 American Board of Internal Medicine (ABIM)-certified faculty preceptors led the standardized teaching sessions. All the sessions began with an objective and an orientation to the skill. Interns experienced a variety of modalities including didactic teaching, hands-on skill practice with simulators, online modules, and interaction with standardized patients. Table 1 provides additional specifics regarding teaching methods and related core competencies for each clinical skill. In addition, we have described the details of each intervention in earlier reports.32–36

Table 1
Table 1
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Measurements

Residents completed a five-station CSE after the teaching sessions. We modeled the CSE after other CSEs that link the mastery model of education to skill transfer in the clinical environment and improved patient care quality.14,17,29 Assessments included performance of simulated procedures (cardiac auscultation, paracentesis, LP), bedside management of critically ill patients, and communication with patients. Data from all assessment tools had been previously evaluated for reliability and validity.32–36 Details regarding assessment tools for each competency including reliability coefficients from earlier studies are available in Table 1.

We required all boot camp participants to meet or exceed a previously set minimum passing standard (MPS) for each of the five components of the CSE.32–36 Clinical experts determined MPSs using the Angoff (item-based) and Hofstee (group-based) standard setting methods.37 Interns who did not achieve the MPS engaged in more deliberate practice, and we retested them until they reached the MPS; this continued practice until the trainee reaches a minimal level of competence is the key feature of mastery learning.28

Historical control interns (n = 109) did not participate in the boot camp educational intervention. We previously assessed them on the same CSEs to provide baseline performance data. Historical controls from 2010 (n = 58) completed the paracentesis, LP, and code status discussion CSEs.33,34,36 Historical control interns from 2009 (n = 51) completed the cardiac auscultation and ICU clinical skills CSEs.32,35

We assessed internal consistency reliability for the cardiac auscultation multiple-choice exam.32 We video-recorded the paracentesis, LP, ICU clinical skills, and code status discussion CSEs from interns in both the intervention and control groups to assess interrater reliability. A second rater rescored a 50% random sample of all video-recorded CSEs using the checklists. These examiners were blind to study design and aim.

Intervention and historical control group participants provided demographic data including age, gender, medical school, and United States Medical Licensing Exam (USMLE) Step 1 and 2 scores. Boot camp participants provided information about their prior clinical experiences managing patients requiring each procedure or skill, and they assessed their baseline confidence to perform each clinical skill on a self-rating scale (0 = not confident to 100 = very confident). We also surveyed boot camp participants about their satisfaction with the curriculum after completing boot camp.

Primary outcome measures were performance of boot-camp-trained interns and historical controls on five parts of a CSE. Secondary outcome measures were resident satisfaction with the curriculum and relationships between CSE performance and resident demographics, prior experience, and self-confidence.

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Statistical analysis

We estimated internal consistency reliability for the cardiac auscultation examination using the KR-21 formula. We estimated checklist score reliability for the paracentesis, LP, ICU clinical skills, and code status discussion CSEs by calculating interrater reliability using the mean kappa (Kn) coefficient across all checklist items. We compared demographic differences between boot-camp-trained interns and historical controls using independent t tests and the chi-square statistic. We compared mean boot camp intern CSE scores with mean historical control scores using independent t tests. We used multiple linear regression to evaluate the relationship between CSE scores and training status (boot-camp-trained interns versus historical controls) when controlling for age, gender, and USMLE Step 1 and 2 scores. To assess relationships within the boot-camp-trained interns between CSE performance and age, gender, prior experience, self-confidence, and USMLE Step 1 and 2 scores, we also used multiple linear regression. We conducted all analyses using IBM SPSS Statistics software, version 20.0 (SPSS Inc., Chicago, Illinois).

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Results

All 47 eligible interns consented to participate and completed the entire protocol. Demographic data for boot-camp-trained interns and historical controls are available in Table 2. USMLE Step 2 scores were slightly higher in the boot-camp-trained group than in two of the historical control groups. We observed no other differences between groups.

Table 2
Table 2
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Internal consistency reliability for boot camp cardiac auscultation exam scores was KR-21 = 0.70. Interrater reliability was high across all components of the boot camp CSE (Kn = 0.85 for paracentesis, Kn = 0.90 for LP, Kn = 0.94 for ICU clinical skills, and Kn = 0.70 for code status discussion).

Figure 1 presents a graphic portrayal of boot-camp-trained intern and historical control CSE performance. Boot-camp-trained interns performed significantly better (P < .01) than historical controls on all skills assessed. Means for each examination were as follows:

Figure 1
Figure 1
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* 91.0% (standard deviation [SD] = 9.6%) versus 76.9% (SD = 14.6%) for cardiac auscultation,

* 94.4% (SD = 4.8%) versus 33.0% (SD = 15.2%) for paracentesis,

* 96.3% (SD = 4.2%) versus 46.3% (SD = 17.4) for LP,

* 89.0% (SD = 7.4%) versus 74.8% (SD = 14.1%) for ICU clinical skills, and

* 76.4% (10.0%) versus 53.2% (SD = 16.2%) for code status discussions.

Results remained significant after controlling for age, gender, and USMLE Step 1 and 2 scores (P < .001).

Table 3 presents baseline experience and self-confidence for boot-camp-trained interns. Regression analysis also showed that there were no significant relationships within the boot-camp-trained group between CSE scores and age, gender, prior experience, self-confidence, or USMLE Step 1 and 2 scores.

Table 3
Table 3
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Most interns met the MPS on the CSE for each skill after standard training. Interns who did not initially meet the MPS were referred for additional practice and retesting until they reached the MPS. We did not detect any demographic or academic differences between the interns who initially met the MPS and those who required additional training. Of the 47 boot camp interns, 6 (13%) needed additional training of up to one hour in cardiac auscultation, 2 (4%) needed an additional hour of training in paracentesis, 7 (15%) in LP, 11 (23%) in ICU clinical skills, and 18 (38%) in code status discussions.

The curriculum was rated highly (Table 4). Participants agreed that the boot camp provided valuable preparation for their internship, boosted their self-confidence and clinical skills, and should be a required part of internal medicine residency education.

Table 4
Table 4
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Discussion and Conclusions

This study shows that a three-day SBML boot camp curriculum is a feasible and effective way to help ensure competence for incoming interns in a broad range of important clinical skills before starting postgraduate training in internal medicine. Our results clearly demonstrate that boot-camp-trained interns performed significantly better than historical controls in a variety of skills essential to high-quality patient care. These skills include the core competencies of patient care (cardiac auscultation, paracentesis, LP), medical knowledge (ICU clinical skills), and communication skills (leading a code status discussion) and include judgment, discernment, and participation in team-based care. To “graduate” from boot camp and begin their clinical training, interns must demonstrate a level of skill predetermined by an expert panel as required for safe and effective patient care.

To our knowledge, this is the first study to impose rigorous competency measurements and an MPS for clinical skills of incoming internal medicine interns. Use of the mastery model requires physicians-in-training to attain a minimum standard of proficiency in a broad range of clinical skills before starting actual patient care. Most interns met the MPS for each clinical skill within the standard boot camp curriculum. Remediation was rarely needed for procedural skills but was necessary for a larger percentage of interns in leading a code status discussion. We think this outcome is likely due to the complexity of talking about code status and the limited opportunity for medical students to observe and participate in such conversations. The individualized approach to learning and assessment used in this study fits with new graduate medical education paradigms such as the Milestones Project of the ABIM, through which residents acquire levels of knowledge, skills, and attitudes to advance in and graduate from their training program.38

Our results confirm that current training models are insufficient to prepare medical school graduates to enter postgraduate training. Interns reported very low self-confidence to perform any of the clinical skills except cardiac auscultation. They reported low confidence despite performing well above average on USMLE Steps 1 and 2 and despite the fact that almost all of them graduated from U.S. medical schools, where one assumes that clinical education is rigorous and of high quality. The majority of interns had no experience with the common bedside procedures of paracentesis and LP, and almost 30% reported no experience with ICU clinical skills or code status discussions. Importantly, neither prior experience nor self-confidence predicted CSE performance. Even though interns are supervised during actual clinical care, skills such as these are necessary on the first day of residency. Because U.S. medical school graduates in this study have not acquired these skills, the alternative to boot camp is the traditional method of learning on the job. This model is inefficient, inaccurate, and challenging because of new duty hours limitations.39 Incoming interns have a range of clinical experience and skill. As shown by the course evaluation questionnaire, interns are aware of their deficiencies, and they are motivated and enthusiastic about participating in a rigorous educational experience. A boot camp curriculum with required minimum performance standards reduces variation and allows for further skill development and assessment once clinical training begins.

Poor baseline performance of basic clinical skills by interns at well-known centers for graduate medical education in this study and others6,7 is cause for serious concern. Reliance on passive clinical training during medical school clerkships, without rigorous skill assessment and feedback, is insufficient preparation for internship and affects patient care quality.1–5 Medical educators must look beyond traditional clerkship models with 19th-century origins40 and develop curricula to ensure that 21st-century physicians are competent to provide safe and effective patient care. Changes in the senior year of medical school and modified graduation requirements are needed to assure the public that medical school graduates possess the necessary knowledge, skills, and attitudes to enter postgraduate training in their chosen specialty.

SBML shows great promise to boost the skills and help correct the deficiencies displayed by recent medical school graduates. Use of simulation-based education as an adjunct to traditional clinical training is superior to clinical training alone.41 A growing body of evidence also demonstrates that skills attained during SBML are retained over time,42,43 improve patient outcomes,14,17,29 and have collateral effects that further improve the residency training environment.44

This study has several limitations. First, we conducted it at a single institution with a limited number of trainees. Second, we did not evaluate all clinical skills. However, the ones we studied are a representative sample of the skills needed to begin internal medicine residency training. Future boot camp curricula might also include topics such as patient care handoffs and transitions of care. Third, we have no information on skill retention after boot camp, and further study is needed to determine the role of booster training. Fourth, we have not yet linked skills attained during boot camp with improved patient care, although the SBML model has demonstrated these effects in earlier work.14,17,29,32 Finally, our intervention cost $34,282 (including faculty time, resident salary, space rental, and supplies), and we have not assessed the cost-effectiveness of boot camp. Doing so is important, yet challenging, because the costs of inefficiency, redundant or erroneous test ordering, and poor physician–patient communication are often hidden. We are encouraged by findings that SBML was highly cost-effective (return on investment 7:1) when it was used previously in the residency training environment to reduce preventable patient care complications.30

In summary, SBML intern boot camp improves clinical skills, reduces variation, and enhances confidence. The mastery model allows for individualized training and assessment of interns and ensures that each intern has attained a baseline level of skill before providing actual patient care. This study is a first step toward the new educational models that medical educators must develop and use in order to make July safer.

Acknowledgments: The authors acknowledge Douglas E. Vaughan, MD, for his support and encouragement of this work.

Funding/Support: Northwestern Memorial Hospital and Excellence in Academic Medicine Act supported by the Illinois Department of Healthcare and Family Services.

Other disclosures: Dr. McGaghie’s contribution was supported in part by the Jacob R. Suker, MD, professorship in medical education and by grant UL 1 RR 025741 from the National Center for Research Resources, National Institutes of Health (NIH). The NIH had no role in the preparation, review, or approval of the manuscript.

Ethical approval: Northwestern University institutional review board approved this study.

Previous presentations: Material from this manuscript was presented as a poster at the Association of Program Directors in Internal Medicine Spring Meeting, April 2012, Atlanta, Georgia.

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