Construction and validation of a non-organic, homemade, low-cost cricothyrotomy simulator. A cross-sectional study

Abstract

Introduction: Cricothyrotomy is a procedure that may save lives in emergency acute respiratory failure. Cricothyrotomy must be trained during undergraduate medical education, and low-cost simulators may offer a satisfying solution in economical and practical terms. Objective: The aims of this study were to build and assess the face, content, and construct validity of a low-cost, homemade cricothyrotomy simulator developed by the authors. Methods: Forty-seven students and nine surgeons performed three successive simulated cricothyrotomies and answered a face and content validity questionnaire. The construct validity was tested by comparing procedural duration and a global performance score intra- and between groups. Results: Most face and content validity questionnaire items were highly and positively rated, with no difference between the groups. Accordingly, students and surgeons agreed that the simulator resembles a human neck anterior surface, is easy and safe to use, allows the performance of critical steps of the cricothyrotomy, and exhibits potential teaching feasibility. Procedural duration decreased between the first and third attempts among students (mean time decrease = 61.85 s; 95% CI - 41.86 - 81.85; p < 0.001), and a significant difference was found between surgeons’ and students’ performance duration (mean difference = 101.36 seconds [95% CI = 69.08 - 133.64] p < 0.001), suggesting construct validity. The students’ performance scores improved between the first and second attempts (mean difference = 2.25 points; CI 95% = 1.31 - 3.20; p < 0.001). Conclusions: The non-organic, homemade, low-cost cricothyrotomy simulator has acceptable face, content, and construct validity and is suitable for use as a training tool by undergraduate medical students.