A nurse is working in an emergency department. Which patient requires airborne precautions?

Pulmonary tuberculosis requires airborne precautions as patients remain infectious for weeks despite treatment. Other options require contact or droplet precautions.

Core Nursing Explanation Key Concept Analysis: This question tests your knowledge of Transmission-Based Precautions, specifically identifying which diseases require Airborne Precautions. The core principle is understanding the mode of transmission: airborne transmission involves small droplet nuclei (≤5 microns) that can remain suspended in the air and travel long distances, requiring a Negative Pressure Isolation Room and an N95 respirator or higher for healthcare personnel.

Answer Rationale: Key Point! Pulmonary Tuberculosis (TB) is a classic example of an airborne disease. The infectious agent, *Mycobacterium tuberculosis*, is transmitted via airborne droplet nuclei. A patient is considered infectious until they have been on effective anti-tuberculosis therapy for a sufficient time, have clinical improvement, and have three consecutive negative sputum smears. Being on therapy for only 10 days does not guarantee the patient is non-infectious. Therefore, airborne precautions are still required.

Distractor Analysis:
Watch out for confusion! Option ② (MRSA wound infection) requires Contact Precautions (gown and gloves) because it is transmitted primarily by direct contact with the infected wound or contaminated items.
Watch out for confusion! Option ③ (*Clostridium difficile*-associated diarrhea) requires Contact Precautions, often with the addition of soap and water for hand hygiene (as alcohol-based hand rubs are less effective against *C. diff* spores).
Watch out for confusion! Option ④ (Influenza A) requires Droplet Precautions (surgical mask) because it is transmitted by large respiratory droplets (>5 microns) that travel short distances (usually ≤3 feet).

Related Concepts: Remember the "Big 3" airborne diseases often tested: Measles (Rubeola), Varicella (Chickenpox) (including disseminated zoster), and Tuberculosis (TB). Other notable airborne pathogens include *Mycobacterium tuberculosis* and the virus causing COVID-19 in certain aerosol-generating procedures.

Concept Summary

Precaution Type	Key Diseases/Pathogens	Required PPE & Room	Transmission Mode
Airborne	TB, Measles, Varicella	N95 respirator, Negative Pressure Room	Small droplet nuclei (≤5 microns), suspended in air
Droplet	Influenza, Pertussis, Meningitis, Group A Strep	Surgical Mask, Private or Cohort Room	Large droplets (>5 microns), travel ≤3 feet
Contact	MRSA, VRE, *C. diff*, RSV, Draining wounds	Gown & Gloves, Private or Cohort Room	Direct contact or indirect contact with contaminated surfaces

Side-by-Side Comparison!

Condition	Precaution Type	Critical Nursing Action	Common Pitfall
Pulmonary TB	Airborne	Place in negative pressure room. Wear N95 for entry.	Stopping isolation too early based on therapy duration alone.
Influenza	Droplet	Place patient in private room or cohort. Wear surgical mask within 3 feet.	Confusing with airborne and using an N95 unnecessarily.
MRSA Wound	Contact	Wear gown & gloves for direct contact. Dedicate equipment.	Forgetting contact precautions for non-intact skin contact.

Anatomy, Physiology & Pharmacology Points The pathophysiology of TB involves inhalation of droplet nuclei into the alveoli, where the bacteria are phagocytosed by macrophages but can survive and multiply, leading to a granulomatous reaction. Anti-tuberculosis therapy (e.g., Isoniazid, Rifampin, Pyrazinamide, Ethambutol) works by inhibiting bacterial cell wall synthesis or metabolism, but it takes weeks to significantly reduce bacterial load and infectiousness.

Memory Tips Mnemonic for Airborne Diseases: "My Chicken Vomits Measles (MCVM)" - Mycobacterium tuberculosis (TB), Chickenpox (Varicella), Varicella-Zoster (disseminated), Measles.
PPE Recall: "Airborne needs an Advanced mask (N95). Droplet needs a Disposable mask (surgical). Contact needs to Cover clothes (gown) and Clean hands (gloves)."

High-Frequency NCLEX Topics Transmission-Based Precautions are a High Yield topic. The NCLEX loves to test your ability to prioritize which patient needs which type of isolation first, or to identify the incorrect action by a nurse regarding PPE. Always think: "What is the mode of transmission?"

Watch Out for Question Variations! * Priority: "Which patient should the charge nurse assign to the negative pressure room?" (Answer: The TB patient). * Procedure: "The nurse is preparing to enter the room of a patient with pulmonary TB. Which action is correct?" (Answer: Donning a fit-tested N95 respirator). * Discontinuation: "A patient with TB has been on multi-drug therapy for 2 weeks and feels better. When can airborne precautions be discontinued?" (Answer: Not based on time or feeling alone; requires negative sputum smears).

Nursing Clinical Practice Guide Clinical Scenario: You are triaging in the ED. A 45-year-old male presents with a 3-week history of worsening cough, night sweats, weight loss, and now hemoptysis (blood-tinged sputum). He reports a recent positive PPD (Tuberculin Skin Test) but never started treatment. Chest X-ray shows infiltrates in the upper lobes.

Nursing Intervention Strategy: 1. Immediate Action & Assessment: Upon suspicion of active pulmonary TB, immediately place a surgical mask on the patient to contain respiratory droplets. Escort him directly to a Negative Pressure Isolation Room. Do not let him wait in the general waiting area. 2. Precautions Initiation: Implement Airborne Precautions. Place clear signage on the door. Ensure all staff and visitors use N95 respirators (must be fit-tested) before entering. 3. Specimen Collection & Diagnostics: Collect sputum samples for acid-fast bacilli (AFB) smear and culture. Educate the patient on producing a good deep cough specimen. 4. Medication & Education: Once diagnosed, administer prescribed multi-drug therapy (e.g., RIPE regimen). Educate on the importance of Directly Observed Therapy (DOT) to ensure adherence and prevent drug resistance. Monitor for hepatotoxicity (liver function tests) and optic neuritis (vision checks with Ethambutol). 5. Discontinuation of Precautions: Collaborate with the physician and infection control. Precautions are typically discontinued after the patient is on effective therapy, shows clinical improvement, and has three consecutive negative AFB sputum smears collected 8-24 hours apart.

Patient Safety and Precautions: * Key Point! The patient must remain in the negative pressure room with the door closed. Transport outside the room should be limited and require the patient to wear a surgical mask. * Watch out for confusion! For immunocompromised patients exposed to Varicella or Measles, Airborne and Contact Precautions are often required simultaneously, as the virus can also be spread from skin lesions via contact.
Nursing Procedure & Medication Flow Procedure: Donning and Doffing PPE for Airborne Precautions 1. Perform hand hygiene. 2. Don N95 Respirator: Perform a User Seal Check each time. 3. Don gown (if contact with patient or environment anticipated) and gloves. 4. Enter room. 5. After care, doff PPE in this order to avoid self-contamination: Gloves → Gown → Perform hand hygiene → Exit room → Remove N95 by touching only the straps → Perform hand hygiene immediately.
A Word from Your Senior Nurse "In the real world of the ED, identifying and isolating a potential TB patient quickly is a major infection control win. It protects every other patient and staff member in the department. Remember, your first instinct when you hear 'productive cough + night sweats + weight loss' should be 'TB until proven otherwise' and 'mask the patient, not just yourself.' This proactive thinking is what makes a safe and astute nurse. For the NCLEX, drill the precaution types until they're second nature—it's one of the most straightforward ways to score points and, more importantly, it's foundational for safe practice."