A nurse is caring for a patient with active pulmonary tuberculosis. Which isolation precaution should the nurse implement?

Pulmonary tuberculosis requires airborne precautions with an N95 respirator because TB is transmitted via airborne droplet nuclei that remain suspended in air. Contact, droplet, and standard precautions are insufficient for this airborne pathogen.

Core Nursing Explanation Key Concept Analysis: This question tests your knowledge of Transmission-Based Precautions and their application to specific infectious diseases, a critical component of infection control. The core theme is identifying the correct precaution category based on the primary mode of transmission for Mycobacterium tuberculosis. The pathophysiology is key: TB is spread via airborne droplet nuclei, which are tiny particles (≤5 microns) containing the bacteria. These particles are produced when a person with active pulmonary TB coughs, sneezes, or speaks. Due to their small size, they can remain suspended in the air for long periods and can be inhaled by others, traveling deep into the alveoli to cause infection.

Answer Rationale: Key Point! Airborne precautions are specifically designed for pathogens transmitted via the airborne route. The Centers for Disease Control and Prevention (CDC) guidelines mandate that healthcare workers wear a N95 respirator or higher-level respiratory protection (e.g., PAPR) when entering the room of a patient on airborne precautions. An N95 respirator is a tight-fitting device that filters out at least 95% of airborne particles, including droplet nuclei. The patient must also be placed in a negative pressure isolation room (airborne infection isolation room - AIIR) to prevent contaminated air from escaping into hallways or other patient areas.

Distractor Analysis:
Watch out for confusion! Option 1 (Contact precautions): This is for diseases spread by direct contact with the patient or indirect contact with contaminated surfaces (e.g., MRSA, C. diff, RSV). TB is not primarily spread by contact.
Watch out for confusion! Option 3 (Droplet precautions): This is for pathogens spread via large respiratory droplets (>5 microns) that travel short distances (usually 3-6 feet) and land on surfaces (e.g., influenza, pertussis, meningococcal meningitis). Droplet precautions require a surgical mask, not an N95. TB requires protection against much smaller, aerosolized particles.
Watch out for confusion! Option 4 (Standard precautions only): Standard precautions (hand hygiene, PPE based on anticipated exposure) are the minimum level used for all patients. However, for known or suspected infections with specific transmission routes, additional Transmission-Based Precautions (Airborne, Droplet, Contact) must be implemented. TB absolutely requires more than standard precautions.

Related Concepts: Understanding the differences between airborne, droplet, and contact precautions is fundamental for NCLEX and clinical practice. Always link the disease to its mode of transmission. Other diseases requiring airborne precautions include measles (rubeola), varicella (chickenpox), and disseminated herpes zoster (shingles). Remember, for TB, the key elements are: Negative Pressure Room + N95 Respirator.

Concept Summary Airborne Precautions (for Mycobacterium tuberculosis):
• Purpose: Prevent transmission of infectious agents that remain infectious over long distances when suspended in the air.
• Key PPE: N95 respirator or PAPR (Powered Air-Purifying Respirator).
• Room Requirement: Negative pressure airborne infection isolation room (AIIR).
• Patient Transport: Patient wears a surgical mask during transport.
• Other Diseases: Measles, Varicella, Disseminated Herpes Zoster.

Side-by-Side Comparison!

Precaution Type	Pathogen Size / Route	Key PPE	Room Requirement	Example Diseases
Airborne	≤5 microns (Droplet nuclei) Aerosolized, long-distance	N95 Respirator or PAPR	Negative Pressure (AIIR)	TB, Measles, Varicella
Droplet	>5 microns Short distance (3-6 ft)	Surgical Mask	Private room or cohort (Door may be open)	Influenza, Pertussis, Meningitis
Contact	Direct/Indirect contact	Gown & Gloves	Private room or cohort	MRSA, VRE, C. diff, RSV

Anatomy, Physiology & Pharmacology Points • Pathophysiology: Mycobacterium tuberculosis is an acid-fast bacillus. When inhaled, droplet nuclei deposit in the alveoli. Macrophages engulf the bacteria, but they can survive and multiply inside these cells, leading to the formation of granulomas (tubercles). Active disease occurs when the immune system cannot contain the infection.
• Drug Therapy: First-line treatment for active TB typically involves a multi-drug regimen (e.g., RIPE: Rifampin, Isoniazid, Pyrazinamide, Ethambutol) to prevent resistance. A key nursing responsibility is ensuring Directly Observed Therapy (DOT) to promote adherence.

Memory Tips • Acronym: My Chicken Has Varicella, TB, Measles (M-CH-V-T-M) for Airborne diseases: Measles, Chickenpox (Varicella), Herpes zoster (disseminated), Varicella, TB, Measles. (Note: This is a mnemonic to remember the list; Varicella and Chickenpox are the same).
• Visual: Think of an N95 mask and a room with a sign that says "Negative Pressure" – this is the mental image for TB isolation.

High-Frequency NCLEX Topics Isolation precautions are a High Yield topic. The NCLEX loves to test your ability to:
1. Select the correct precaution type for a given disease.
2. Identify the necessary PPE for entering a patient's room.
3. Prioritize actions when caring for a patient in isolation (e.g., donning/doffing PPE sequence).
4. Educate patients and families about isolation requirements.

Watch Out for Question Variations! • Instead of asking "Which precaution?", they might ask: "Which action by the nurse is correct when caring for a patient with TB?" (Correct action: dons an N95 respirator).
• They could ask about patient education: "What should the nurse teach the patient's family about visiting?" (Teach them to wear a surgical mask if they are immune-competent, or to avoid visitation if immunocompromised).
• They might combine it with medication: "The nurse is administering Isoniazid to a patient with TB. Which precaution is also required?" (Airborne precautions are still needed until the patient is no longer infectious).

Nursing Clinical Practice Guide Clinical Scenario: You are assigned to Mr. Johnson, a 58-year-old admitted with a persistent cough, night sweats, and weight loss. A sputum culture confirms active pulmonary tuberculosis. He is placed in Room 312, which has an airborne infection isolation sign on the door.

Nursing Intervention Strategy: 1. Assessment: Monitor respiratory status (rate, effort, SpO2), cough characteristics (productive? bloody?), and systemic symptoms (fever, fatigue). Assess understanding of disease and isolation. 2. Planning & Implementation: • Isolation Compliance: Always perform hand hygiene and don a fit-tested N95 respirator before entering the room. Ensure the negative pressure room is functioning (you should feel air flowing into the room under the door). • Medication Administration: Administer multi-drug TB regimen as ordered, often via Directly Observed Therapy (DOT) to ensure every dose is taken. Monitor for hepatotoxicity (liver function tests) and neurotoxicity (peripheral neuropathy from Isoniazid). • Patient Education: Teach cough etiquette (cover mouth with tissue), importance of completing full course of treatment (6-9 months), and symptoms to report (jaundice, vision changes, numbness). • Transport: If Mr. Johnson needs to leave the room for a test, he must wear a surgical mask. 3. Evaluation: Evaluate for decreased infectivity (typically after 2-3 weeks of effective therapy and negative sputum smears), adherence to treatment, and management of side effects.

Patient Safety and Precautions: • Contraindications: Do not place immunocompromised patients or those with varicella/measles susceptibility near the TB isolation room. • PPE Doffing: Remove PPE carefully to avoid self-contamination. Remove gloves first, then gown, then perform hand hygiene, then remove N95 respirator by the straps (avoid touching the front), followed by final hand hygiene. • Visitors: Screen visitors. Those with known immunity may visit with a surgical mask. Immunocompromised visitors should be discouraged.

Nursing Procedure & Medication Flow Entering an Airborne Isolation Room (Step-by-Step):
1. Perform hand hygiene.
2. Don a clean gown (if contact with patient or environment is anticipated).
3. Don the N95 respirator. Perform a user seal check (positive and negative pressure check) to ensure proper fit.
4. Don eye protection (if needed) and gloves.
5. Enter the room.
Exiting the Room:
1. Remove gloves and gown inside the room, discard in designated waste.
2. Perform hand hygiene.
3. Exit the room.
4. Remove eye protection (if used).
5. Remove N95 respirator by the straps, discard or store appropriately.
6. Perform final hand hygiene.

A Word from Your Senior Nurse "Remember, infection control is one of the most powerful tools we have to protect our patients, ourselves, and the community. When you see 'TB' on a patient's chart, your brain should immediately flash: N95 and Negative Pressure Room. In clinical practice, never take shortcuts with PPE. That properly fitted N95 isn't just a piece of equipment; it's your shield. On the NCLEX, they're testing your foundational knowledge of safety. Mastering these precautions means you understand how to break the chain of infection – and that makes you a safe, competent nurse from day one."