A nurse is caring for a patient with suspected tuberculosis (TB) who has been placed in airborne precautions. Which action by the nurse demonstrates correct implementation of airborne precautions?

Airborne precautions for TB require an N95 respirator to filter airborne droplet nuclei. Surgical masks, open doors, or standard precautions alone are insufficient for this highly contagious airborne disease.

Core Nursing Explanation Key Concept Analysis: This question tests the correct application of Airborne Precautions for a patient with suspected Tuberculosis (TB). TB is caused by *Mycobacterium tuberculosis* and is transmitted via airborne droplet nuclei—tiny particles that can remain suspended in the air for long periods and are inhaled into the alveoli. Standard Precautions are insufficient; specific Airborne Precautions are mandated by the CDC (Centers for Disease Control and Prevention).

Answer Rationale: Key Point! The cornerstone of Airborne Precautions for TB is respiratory protection using a N95 respirator (or higher-level protection like a PAPR - Powered Air-Purifying Respirator). An N95 respirator is a tight-fitting device that filters at least 95% of airborne particles, including droplet nuclei. This is fundamentally different from a loose-fitting surgical mask, which is designed to protect others from the wearer's large droplets, not to protect the wearer from inhaling infectious aerosols.

Distractor Analysis:

• Option 1 (Wearing a surgical mask): A Watch out for confusion! Surgical mask is used for Droplet Precautions (e.g., influenza, pertussis) and Standard Precautions. It does not provide a seal and does not filter small airborne particles like the N95. Using it for TB is incorrect and unsafe.
• Option 2 (Private room with door open): A core component of Airborne Precautions is a negative-pressure isolation room with the door closed to prevent contaminated air from flowing into the hallway. Keeping the door open defeats the purpose of containment and increases the risk of transmission to others.
• Option 3 (Standard precautions only): This is dangerously incorrect. TB is a highly contagious airborne disease. Standard Precautions (e.g., hand hygiene, gloves for anticipated contact with body fluids) are always used but are not sufficient for diseases requiring Airborne Precautions.

Related Concepts: Airborne Precautions also include placing the patient in an airborne infection isolation room (AIIR), limiting patient transport, and instructing the patient to wear a surgical mask if transport is necessary. Other diseases requiring Airborne Precautions include measles, varicella (chickenpox), and disseminated herpes zoster (shingles).

Concept Summary The three main Transmission-Based Precautions are:

• Airborne: For pathogens spread via small droplet nuclei (<5 microns). Requires N95 respirator, negative-pressure room, door closed.
• Droplet: For pathogens spread via large droplets (>5 microns) from coughs/sneezes. Requires surgical mask, private room or cohorting, door may be open.
• Contact: For pathogens spread by direct or indirect contact. Requires gown and gloves, private room preferred.

Side-by-Side Comparison!

Precaution Type	Key PPE (Personal Protective Equipment)	Room Requirement	Example Diseases
Airborne	N95 Respirator (or PAPR)	Negative-pressure, door closed	Tuberculosis (TB), Measles, Varicella
Droplet	Surgical Mask	Private room or cohorting, door may be open	Influenza, Pertussis, Meningitis
Contact	Gown & Gloves	Private room preferred	MRSA (Methicillin-resistant *Staphylococcus aureus*), C. *difficile*, RSV (Respiratory Syncytial Virus)

Anatomy, Physiology & Pharmacology Points

• Pathophysiology: TB bacteria are inhaled into the alveoli, where they are engulfed by macrophages. They can survive inside these cells, leading to granuloma (tubercle) formation. Active disease can cause pulmonary symptoms (cough, hemoptysis) and systemic symptoms (fever, night sweats, weight loss).
• Pharmacology: TB treatment involves a multi-drug regimen (e.g., Isoniazid, Rifampin, Pyrazinamide, Ethambutol) for 6-9 months to prevent drug resistance. Nurses must monitor for hepatotoxicity and educate on adherence.

Memory Tips

• N95 for Airborne: Think "Need 95% filtration for tiny particles in the Air."
• Door Status: For Airborne, the door must be "Closed to Contain." For Droplet, it can be "Open for Ordinary ventilation."
• MY TV (Mnemonic for Airborne diseases): Measles, Yellow fever (theoretical), Tuberculosis, Varicella/Herpes zoster.

High-Frequency NCLEX Topics Infection control, especially Transmission-Based Precautions, is a High-Yield topic. The NCLEX-RN frequently tests:

1. Matching the correct PPE to the type of precaution.
2. Identifying which disease requires which precaution.
3. Prioritizing actions when caring for a patient in isolation (e.g., donning/doffing sequence).

Watch Out for Question Variations!

• From Symptom to Precaution: "A patient presents with a rash that is vesicular and in different stages. Which type of isolation is required?" (Answer: Airborne for varicella until lesions crust over).
• Prioritizing Interventions: "The nurse is preparing to enter the room of a patient with TB. What should the nurse do first?" (Answer: Perform hand hygiene before donning PPE).
• Patient Education: "What should the nurse teach a patient on Airborne Precautions?" (Answer: To cover mouth/nose with a tissue when coughing and to wear a surgical mask during transport).

Nursing Clinical Practice Guide Clinical Scenario: You are assigned to Mr. Johnson, a 58-year-old admitted with a 3-week history of productive cough, night sweats, and unexplained weight loss. A sputum smear is pending, but pulmonary TB is suspected. He is placed in Room 304, which has an airborne infection isolation (AIIR) sign on the door.

Nursing Intervention Strategy:

1. Assessment: Monitor vital signs, especially temperature pattern. Assess respiratory status (lung sounds, work of breathing, sputum characteristics). Inquire about close contacts who may need testing.
2. Planning & Implementation:
   • PPE Donning: Perform hand hygiene → don N95 respirator (perform a user seal check each time) → don gown and gloves as needed for contact.
   • Room Management: Ensure the negative pressure monitor indicates the room is under negative pressure. Keep the door closed at all times.
   • Patient Care & Education: Provide a surgical mask for the patient to wear during any essential transport outside the room. Educate on respiratory hygiene (cough into tissue, dispose in no-touch receptacle). Administer and explain the multi-drug TB regimen, stressing the critical importance of completing the full course.
3. Evaluation: Monitor for reduction of symptoms. Ensure sputum samples are collected correctly (early morning, deep cough) for AFB (Acid-Fast Bacilli) testing. Evaluate the patient's understanding of infection control measures and treatment plan.

Patient Safety and Precautions:

• Contraindications: Do not use a surgical mask for staff protection against TB. Do not place immunocompromised patients or those without immunity to measles/varicella near an AIIR room.
• Medication Cautions: First-line TB drugs (like Isoniazid and Rifampin) can cause hepatotoxicity. Monitor LFTs (Liver Function Tests) and teach patients to report jaundice, dark urine, or persistent nausea.
• Key Monitoring: Monitor for airborne isolation protocol breaches. All staff and visitors must be trained in N95 use. The patient remains in isolation until they are on effective therapy, show clinical improvement, AND have three consecutive negative sputum AFB smears.

Nursing Procedure & Medication Flow PPE Donning/Doffing Sequence for Airborne + Contact Precautions (e.g., TB with wound drainage):

1. Donning: 1) Perform hand hygiene. 2) Gown. 3) N95 Respirator. 4) Eye protection (if needed). 5) Gloves.
2. Doffing: 1) Remove gloves. 2) Perform hand hygiene. 3) Remove gown. 4) Perform hand hygiene. 5) Exit room. 6) Remove N95 respirator (by straps, avoid touching front). 7) Perform hand hygiene.

Medication Administration for TB: Directly Observed Therapy (DOT) is often used to ensure adherence. Administer drugs on an empty stomach (unless GI upset occurs, then with food). Ethambutol requires monitoring for visual changes (optic neuritis).

A Word from Your Senior Nurse "Remember, infection control is one of the most powerful tools we have to protect our patients, ourselves, and our communities. When you see that isolation sign, don't think of it as a barrier—think of it as a shield. Taking the extra 30 seconds to properly don your N95 and perform a seal check isn't just a rule; it's an act of professional responsibility. On the NCLEX, they're testing your judgment to choose the safest action. In real life, that judgment keeps everyone healthy. Always connect the 'why'—why N95? Because TB particles are tiny and linger. That understanding will stick with you long after the test."