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Transmission-Based Precautions | 마이메르시 MyMerci
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Transmission-Based Precautions

NCLEX Review Guide: Infectious Diseases - Transmission-Based Precautions

General Concepts of Infectious Disease

Chain of Infection

  • Infectious agent: The pathogen causing disease (bacteria, virus, fungus, parasite)
  • Reservoir: Where the pathogen lives and multiplies (humans, animals, environment)
  • Portal of exit: How the pathogen leaves the reservoir (respiratory secretions, blood, feces)
  • Mode of transmission: How the pathogen spreads (contact, droplet, airborne, vector-borne)
  • Portal of entry: How the pathogen enters a new host (mucous membranes, broken skin, respiratory tract)
  • Susceptible host: Person at risk for infection due to compromised immunity or other factors

Key Points

  • Breaking any link in the chain prevents infection transmission
  • Hand hygiene is the most effective way to break the chain

Transmission-Based Precautions

Contact Precautions

  • Used for infections spread by direct or indirect contact with patient or contaminated surfaces
  • Requires gown and gloves for all patient contact and environmental interaction
  • Patient placement: Private room preferred, or cohort with same organism

Memory Aid: "MRSA VRE C-diff"

Major organisms requiring contact precautions: MRSA, VRE, C. difficile, scabies, impetigo

Droplet Precautions

  • Used for infections spread by large respiratory droplets (>5 micrometers) that travel ≤3 feet
  • Requires surgical mask within 3 feet of patient
  • Patient placement: Private room preferred, or cohort with same organism, maintain 3-foot separation

Memory Aid: "My Pertussis Influenza Rubella"

Major organisms: Meningitis (bacterial), Pertussis, Influenza, Rubella, Mumps, Strep pneumoniae

Airborne Precautions

  • Used for infections spread by small airborne particles (≤5 micrometers) that remain suspended
  • Requires N95 respirator or PAPR for all room entry
  • Patient placement: Negative pressure room with 6-12 air changes per hour

Memory Aid: "MTV"

Major organisms: Measles, Tuberculosis (pulmonary), Varicella (chickenpox/shingles)

Commonly Confused Points

Precaution Type PPE Required Room Requirements Key Examples
Contact Gown + Gloves Private room preferred MRSA, VRE, C-diff
Droplet Surgical mask (within 3 ft) Private room, 3-ft separation Influenza, Pertussis
Airborne N95 respirator Negative pressure room TB, Measles, Varicella

Clinical Scenario

Patient with suspected tuberculosis is admitted. Immediate actions: Place in negative pressure room, all staff must wear N95 respirators, limit transport, and notify infection control.

PPE Donning and Doffing

  1. Donning Order: Hand hygiene → Gown → Mask/Respirator → Eye protection → Gloves
  2. Doffing Order: Gloves → Eye protection → Gown → Mask/Respirator → Hand hygiene

Critical Points

  • Always perform hand hygiene before donning and after doffing PPE
  • Remove gloves first when doffing to prevent contamination
  • Never touch the front of mask/respirator when removing

Study Tips & Quick Checks

NCLEX Success Tips

  • Remember: Standard precautions apply to ALL patients
  • When in doubt about precaution type, consider the mode of transmission
  • Always choose the most protective option on NCLEX questions

Common Pitfalls

  • ❌ Confusing droplet vs. airborne (remember the 3-foot rule for droplets)
  • ❌ Forgetting that shingles can be both contact AND airborne if disseminated
  • ❌ Not recognizing that some organisms require multiple precautions

Self-Assessment Checklist

  • ☐ I can identify the three types of transmission-based precautions
  • ☐ I know the correct PPE for each precaution type
  • ☐ I understand proper donning and doffing sequence
  • ☐ I can categorize common organisms by precaution type

You've got this! Master these infection control principles and you'll protect both your patients and yourself. Every nurse is an infection prevention champion! 🌟

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