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Question

Difficulty: MediumInfectious Diseases

A 42-year-old man presents to the emergency department triage desk with a 4-week history of productive cough, hemoptysis, night sweats, and a 5-kg (11-lb) unintentional weight loss. He is actively coughing in the waiting area. He recently immigrated from a region with high tuberculosis endemicity.

Arrange the following steps in the most appropriate chronological order for the initial management and evaluation of this patient.

  1. 1Place a standard surgical mask on the patient immediately to contain respiratory secretions.
  2. 2Transfer the patient to a negative-pressure airborne infection isolation room.
  3. 3Healthcare personnel don N95 respirators prior to entering the patient's isolation room.
  4. 4Obtain a chest radiograph to assess for apical infiltrates or cavitary lesions.
  5. 5Collect three consecutive sputum specimens (8 to 24 hours apart) for acid-fast bacilli (AFB) testing.

Answer

The correct sequence begins with immediate source control (masking the patient), followed by environmental isolation, healthcare worker protection, rapid imaging, and finally definitive microbiologic testing.
In any patient presenting with high clinical suspicion for active pulmonary tuberculosis (cough, hemoptysis, weight loss, endemic exposure), infection control is the paramount initial concern. The immediate first step is source control by placing a surgical mask on the patient. Following this, the patient should be moved out of common areas into a negative-pressure airborne infection isolation room. Only then should healthcare workers don N95 respirators to enter the room for clinical evaluation. Diagnostics proceed systematically: a chest radiograph is obtained quickly to assess for suggestive lesions, followed by the longer process of collecting three serial sputum samples for AFB smear and mycobacterial culture.

Step-by-Step Solution

1
Implement source control by placing a standard surgical mask on the patient.
Respiratory droplets and aerosols are contained at the source.
This is the fastest and most effective way to immediately protect other patients and staff in the triage area.
2
Transfer the patient to an airborne infection isolation room (AIIR).
The patient is placed in an environment with negative pressure.
AIIRs exhaust air directly to the outside or through HEPA filters, preventing the spread of airborne pathogens to other areas of the hospital.
3
Healthcare personnel don N95 respirators or equivalent protection.
Healthcare workers are protected from inhaling infectious aerosols.
Airborne precautions must be fully implemented by staff before they enter the high-risk environment of the patient's room to perform clinical duties.
4
Obtain a chest radiograph.
Radiographic evidence of tuberculosis (e.g., cavitary lesions, apical infiltrates) is evaluated.
Chest imaging is a rapid, essential screening tool to assess the probability of active pulmonary tuberculosis before committing to prolonged microbiologic workups.
5
Collect serial sputum specimens for AFB smear and culture.
Samples are sent for definitive microbiologic diagnosis.
Once clinical and radiographic suspicion is established, definitive diagnosis requires 3 sputum samples collected 8-24 hours apart, making this the final step in the initial ED algorithmic sequence.

Key Concept

The management of suspected active pulmonary tuberculosis must prioritize public health and infection control (source control and isolation) before diagnostic testing (imaging and sputum collection).
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Topics

Infectious Diseases

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