Cumulative sum scoring for medical students.

Area of Science:

• Medical Education
• Clinical Skills Assessment
• Procedural Competency

Background:

• Subjective methods dominate clinical skills assessment in medical training.
• Objective assessment of practical skills remains underdeveloped.
• Cumulative sum (CUSUM) charts are utilized for auditing practical procedural success in medicine.

Purpose of the Study:

• To present and evaluate the use of CUSUM scoring for assessing medical student competency in peripheral venous cannulation.
• To explore modifications of CUSUM plots for early performance feedback.

Main Methods:

• Ten medical students performed 50-65 peripheral venous cannulations each.
• Successes and failures were sequentially recorded.
• CUSUM plots were generated using established algorithms, with modifications for early warning and recognition of performance.

Main Results:

• The 'learning curve' CUSUM modification indicated all students achieved competence.
• Many students required more procedures than typically feasible during medical school to demonstrate competence.
• The 'early warning' CUSUM modification effectively identified deviations from acceptable performance standards.

Conclusions:

• CUSUM scoring provides an objective, user-friendly tool for assessing procedural competency and identifying substandard practice in medical professionals and students.
• The primary limitation for medical student application is the substantial number of procedures needed for a meaningful CUSUM plot.
• CUSUM facilitates timely intervention and targeted training to improve practical skills.