RESUMEN
Purpose: Active learning improves knowledge acquisition and provides medical students with learning habits that become an integral part of their behavior. As an integral element of our institution's transition from a lecture hall teaching culture to active learning, the current project, conducted with fourth year students, aimed to examine the effects of the two envelopes method of teaching on students' knowledge. Method: The class of 120 students was divided into 12 groups of 10 students each. Six experienced senior cardiologists were assigned to teach the 12 groups. When the students arrived at the classroom, they received two envelopes. Students were instructed to open the first envelope and answer a 10-question test in 15 minutes. After completing the test, they returned the tests to the envelope, sealed it, and then opened the second envelope which included the same test and relevant patient information. They then spent the next 30 minutes discussing the test as a group and familiarizing themselves with the patients' case histories and clinical data. After completion of the group discussion, the tutor entered the room for a two-hour discussion of the patients' disease entities including the anatomy, physiology, pathology, clinical presentation, diagnostic measures, and potential therapies. Results: We compared grades and standard deviations of grades between two classes: one learned in the lecture hall format (2018) and the other learned employing the two-envelopes method (2019). There was a non-statistically significant trend toward better grades with reduced dispersion of grades in the class that learned with the two-envelope method. Conclusions: We describe a novel method for active learning that enhances self-learning and peer learning, and we observed better knowledge acquisition and reduced knowledge dispersion that were not statistically significant.