A 29-year-old healthy female nurse presents to the occupational health clinic to establish care prior to beginning employment at a large metropolitan hospital. She immigrated to the United States from India at age 12 and received the Bacillus Calmette-Guérin (BCG) vaccine in infancy. She feels well and reports no cough, fever, night sweats, or weight loss. Her past medical history is unremarkable, and her physical examination is normal. Arrange the following clinical steps in the most appropriate sequential order for the preventive screening and management of tuberculosis in this patient.
- 1Perform an interferon-gamma release assay (IGRA) to screen for tuberculosis infection.
- 2Obtain a chest radiograph to evaluate for active pulmonary tuberculosis.
- 3Establish a diagnosis of latent tuberculosis infection (LTBI).
- 4Initiate prophylactic therapy with a short-course regimen such as isoniazid and rifapentine.
- 5Perform routine clinical monitoring for medication adverse effects such as hepatotoxicity.
Answer
The correct sequence is: 1) Perform an IGRA, 2) Obtain a chest radiograph, 3) Establish a diagnosis of LTBI, 4) Initiate prophylactic therapy, 5) Perform routine clinical monitoring.
The appropriate sequence for tuberculosis screening in a BCG-vaccinated healthcare worker begins with an IGRA. If this initial screen is positive, a chest radiograph is strictly required to rule out active pulmonary TB. Only after active TB is excluded (via a normal radiograph and absence of symptoms) can a diagnosis of LTBI be established. Following the diagnosis, prophylactic treatment (such as isoniazid and rifapentine) is initiated. Continuous clinical monitoring for adverse effects, particularly hepatotoxicity, is then required throughout the duration of the therapy.
Step-by-Step Solution
Key Concept
Tuberculosis screening and management cascade in healthcare workers.