Effects of using an abdominal simulator to develop palpatory competencies in 3rd year medical students.

BACKGROUND: Medical school faculty are hard pressed to provide clerkship students with sufficient opportunity to develop and practice their capacity to perform a competent clinical examination, including the palpatory examination of the abdomen. We evaluated the impact of training with an abdominal simulator, AbSim, designed to monitor the depth, location, and thoroughness of their palpation and to provide concurrent and summative feedback regarding their performance. METHODS: All third-year medical students were given the opportunity to develop their palpatory skills with the AbSim simulator during the family medicine rotation. The performance of those who studied with the simulator was measured by its sensors, before and after a training session that included visual feedback regarding the depth and coverage of the student's manual pressure. Additionally, all students reported their confidence in their evolving abdominal palpation skills at the beginning and end of the rotation. RESULTS: 119 (86.9%) of 137 students filled out the initial questionnaire, and 73 (61.3%) studied with the abdominal simulator. The training produced a highly significant improvement in their overall performance (4 measures, p's < 0.001). Pre-training performance (depth calibration and thoroughness of coverage) was not related to the number of months of previous clinical rotations nor to previous internal medicine or surgery rotations. There was little relation between students' confidence in their abdominal examination skills and objective measures of their palpatory performance; however, students who chose the training started with less confidence, and became more confident after training. CONCLUSIONS: Guided abdominal simulator practice increased medical students' capacity to perform an abdominal examination with more appropriate depth and thoroughness of palpation. Interpretation of changes in confidence are uncertain, because confidence was unrelated to objectively measured performance. However, students with low initial confidence in their abdominal examination seemed to be more likely to choose to study with the abdominal simulator.

Faculty Development Directed at Curricular Reforms Designed to Improve Patient Outcomes.

Three initiatives involving quality of patient outcomes that evolved in the late 1990s must be considered in the design of 21st century undergraduate medical curricula. They involve (1) the question of how to best teach and assess medical competencies, (2) growing concerns regarding the frequency and severity of error in medical care, and (3) the role physicians might play in weaving together the overlapping elements of population-, community-, and systems-based practice into a codified approach to medical care. With these initiatives in mind, the University of North Texas Health Science Center Texas College of Osteopathic Medicine has formed an Academy of Medical Educators whose goal is to develop faculty programs intended to expedite curricular modifications and reforms.

Outcomes-Oriented Medical Training: A Critical Curricular Design Consideration in Developing 21st Century Health Care Professionals.

The core competencies of medical schools and residencies have initiated a change in curricular design but have been limited in their execution of systems-based practice. The introduction of milestones and entrustable professional activities has emerged to enhance the current educational paradigm. Linking public health systemic approaches with evidence-based practices focused on population-level health care will affect patients more than current non-systems-based approaches. Curricular redesign, including population health-based strategies, public health competency, health care policy, and education linking the "determinants of health" to patient care, will better prepare future physicians to practice in the emerging paradigm of health care of the future. Thus, the University of North Texas Health Science Center Texas College of Osteopathic Medicine has launched a 3-phase model that addresses the specific foundational needs required to instantiate fundamental systems-based concepts in faculty, undergraduate medical curricula, and clinical practice.

Evidence of the preferential use of disease prototypes over case exemplars among early year one medical students prior to and following diagnostic training.

BACKGROUND: Two core dual processing theory (DPT) System I constructs (Exemplars and Prototypes) were used to: 1) formulate a training exercise designed to improve diagnostic performance in year one medical students, and 2) explore whether any observed performance improvements were associated with preferential use of exemplars or prototypes. METHODS: With IRB approval, 117 year one medical students participated in an acute chest pain diagnostic training exercise. A pre- and post-training test containing the same 27 case vignettes was used to determine if the subjects' diagnostic performance improved via training in both exemplars and prototypes. Exemplar and Prototype theory was also used to generate a unique typicality estimate for each case vignette. Because these estimates produce different performance predictions, differences in the subjects' observed performance would make it possible to infer whether subjects were preferentially using Exemplars or Prototypes. RESULTS: Pre- vs. post-training comparison revealed a significant performance improvement; t=14.04, p<0.001, Cohen's d=1.32. Pre-training, paired t-testing demonstrated that performance against the most typical vignettes>mid typical vignettes: t=4.94, p<0.001; and mid typical>least typical: t=5.16, p<0.001. Post-training, paired t-testing again demonstrated that performance against the most typical vignettes>mid typical: t=2.94, p<0.01; and mid typical>least typical: t=6.64, p<0.001. These findings are more consistent with the performance predictions generated via Prototype theory than Exemplar theory. CONCLUSIONS: DPT is useful in designing and evaluating the utility of new approaches to diagnostic training, and, investigating the cognitive factors driving diagnostic capabilities among early medical students.

Learning sciences principles that can inform the construction of new approaches to diagnostic training.

The author suggests that the ill-defined nature of human diseases is a little appreciated, nonetheless important contributor to persistent and high levels of diagnostic error. Furthermore, medical education's continued use of traditional, non-evidence based approaches to diagnostic training represents a systematic flaw likely perpetuating sub-optimal diagnostic performance in patients suffering from ill-defined diseases. This manuscript briefly describes how Learning Sciences findings elucidating how humans reason in the face of the uncertainty and complexity posed by ill-defined diseases might serve as guiding principles in the formulation of first steps towards a codified, 21st century approach to training and assessing the diagnostic capabilities of future health care providers.

Improving diagnostic capabilities of medical students via application of cognitive sciences-derived learning principles.

PURPOSE: There is limited experimental evidence concerning how best to train students to perform differential diagnosis. We compared 2 different methods for training 2nd-year medical students to perform differential diagnosis (DDX) of heart failure: a traditional classroom-based lecture (control group) versus a cognitive sciences-based approach to DDX instruction implemented through a computer-based tutor (treatment group). METHODS: Following random assignment to either group, students were trained for 75 minutes, and then given a 40-item examination comprised of cases that varied along a typicality gradient from prototypical (easy) to less typical (hard). RESULTS: The treatment group diagnosed correctly significantly more test cases than the control group (74% versus 60%, respectively). The treatment group also diagnosed correctly significantly more cases at the extremes of the typicality gradient: 81% versus 65%, respectively, for the prototypical cases; 65% versus 48%, respectively, for the most difficult cases. CONCLUSION: The ability to perform differential diagnosis is enhanced by training based upon principles of cognitive sciences.