Common Variable Immunodeficiency: A Standardized Patient Case for Second-Year Medical Students

Area of Science:

• Immunology
• Medical Education

Background:

• Common variable immunodeficiency (CVID) is the most frequent symptomatic antibody deficiency.
• Delayed diagnosis of CVID leads to significant morbidity and mortality due to its complex presentation and varied symptoms.
• CVID diagnosis is often delayed by years, impacting patient outcomes.

Purpose of the Study:

• To evaluate the effectiveness of a simulated patient encounter in assessing medical students' recognition of CVID.
• To gauge students' ability to identify CVID through clinical reasoning and communication skills.

Main Methods:

• A 15-minute Objective Structured Clinical Examination (OSCE) was developed.
• The OSCE included simulated lung sounds, physical exam findings, and a standardized patient presenting with a sinus infection.
• Students conducted patient interviews and hypothesis-driven physical exams, followed by a differential diagnosis exercise.

Main Results:

• The CVID case presented high difficulty levels for students.
• The encounter effectively discriminated between high- and low-performing students in both communication and clinical reasoning.
• Item analysis indicated strong discrimination power.

Conclusions:

• The standardized patient encounter is a valuable tool for assessing CVID recognition in medical students.
• This method can be utilized for both formative and summative evaluations.
• The simulation effectively measures clinical reasoning and diagnostic skills related to CVID.