Lab Chapter 1-9 Infection Control Vocabulary

PPE Essentials and Filtration

  • Mask options discussed: Surgical mask vs N95 respirator; HEPA mentioned in context of airborne containment

    • Surgical mask: capacity to filter up to 5 μm5\,\mu\text{m} (large droplets)

    • N95 respirator: can filter down to about 0.2 μm0.2\,\mu\text{m}, enabling filtration of much smaller particles

    • HEPA filter referenced as part of airborne containment measures

  • Particle sizes and implications

    • Surgical mask filtration: up to 5 μm5\,\mu\text{m} (larger droplets)

    • N95 filtration: down to 0.2 μm0.2\,\mu\text{m} (smaller particles); anything larger than these sizes is blocked by appropriate PPE

  • Always ensure a proper seal on the mask

    • Use nose bridge bend to seal around the nose; ensure a good seal with the soft rim

    • If using goggles, be mindful of fogging and the extra barrier it provides

  • Eye protection and shields

    • For certain procedures (e.g., bronchoscopy), shields or goggles are commonly used to increase coverage

  • Hair and facial clutter considerations

    • Remove or manage facial hair when donning a respirator to ensure a proper seal; hair can interfere with seal and fit

  • Gown considerations and gown management

    • Gown helps protect clothing and skin from contamination; gown is tied/fastened in a way that maintains a clean exterior during use

    • Tie the gown to the side for quick release and to avoid front contamination

  • Donning and doffing principles (overview)

    • Donning order (as discussed): hand hygiene → gown → respirator/mask → eye protection → gloves

    • Doffing order (as discussed): gloves → gown → eye protection/face shield → respirator/mask → hand hygiene

    • Front of PPE is dirty; back is cleaner; manage removal to avoid self-contamination

    • Donning with any added PPE should ensure a clean-to-dirty sequence; doffing should minimize touching contaminated surfaces

  • Hand hygiene timing

    • Hand hygiene duration for sanitizers: 15 s15\text{ s} or more

    • Hand washing duration emphasized as 15 to 20 s15\text{ to }20\text{ s} when washing with soap and water

    • Special note: C. diff requires washing with soap and water rather than sanitizer due to spores

  • Putting PPE on with existing hair and glasses

    • Hair should be managed to avoid interfering with seal; glasses may contribute to fogging but are common; balancing visibility with protection

  • Putting on protective gear for droplets vs airborne transmission

    • Droplet precautions typically involve mask (surgical) and gloves; gown if contact with contaminated surfaces or fluids

    • Airborne precautions require an N95 respirator or equivalent; gloves always used; gown depending on potential for aerosols or contact with contaminated fluids

  • PPE and equipment for procedures that generate aerosols

    • Bronchoscopy and similar procedures may require higher levels of protection (gown + respirator + eye protection + gloves)

    • Awareness that some procedures can aerosolize respiratory secretions and necessitate enhanced PPE

  • Mask removal and contaminated surfaces

    • Do not remove PPE by touching the front of the mask; remove from the back/front appropriately to avoid contact with contaminated surfaces

    • Eye protection and mask removal should be sequenced to minimize touching contaminated areas

  • PPE reuse and stock considerations during outbreaks

    • In COVID context, single-use guidance evolved to longer reuse periods (e.g., up to 30 days) in some settings due to supply constraints; always follow current CDC/hospital policy

  • Personal experience with PPE wear and discipline

    • Some clinical cultures show variability in PPE use; emphasis on understanding organism transmission to tailor PPE use to the situation

  • Summary notes on PPE goals

    • PPE protects the caregiver from contamination, helps prevent cross-contamination, and protects the environment by limiting pathogen spread

    • Improper removal of PPE can cause self-contamination and environmental contamination

  • Basic PPE components demonstrated or referenced in session

    • N95 respirator, surgical mask, goggles/eye protection, face shield, gloves, gown, hair management, and gown fasteners

  • Practical tips and cautions from the discussion

    • Front of PPE is dirty; back is relatively cleaner; avoid touching the front when removing

    • For negative pressure or airborne isolation, additional room controls (e.g., negative pressure room, air exchanges) are necessary

    • Remember: PPE is part of a broader infection-control strategy including hand hygiene, surface disinfection, and proper environment management

Transmission-based Precautions and Pathways

  • Transmission categories covered in the discussion

    • Standard precautions: basic level applied to all patient care to prevent transmission

    • Transmission-based precautions: additional PPE and controls based on suspected or confirmed transmission route

  • Droplet transmission

    • Droplets: larger particles that settle within a close range

    • Typical distance for droplets: 3 to 6 ft3\text{ to }6\ \text{ft}

    • PPE for droplets: surgical mask, gloves; gown if there is risk of contact with contaminated surfaces or fluids

    • Examples of organisms associated with droplets: influenza, RSV, group A strep, pertussis

    • Surface contamination and transmission via droplets: droplets may contaminate surfaces and objects; cleaning and disinfection of surfaces is essential

  • Airborne transmission

    • Airborne particles: smaller particles that can stay suspended in air for extended periods; can travel longer distances

    • Particle size criterion discussed: less than or equal to 0.2 μm0.2\,\mu\text{m} (outlined in the conversation) for deep filtration; actual guidance often references smaller aerosols; here the emphasis is on the need for N95 to prevent inhalation of small particles

    • PPE for airborne: N95 respirator or higher; gloves; gown may be added depending on procedure and risk; negative pressure room and air exchanges are highlighted as environmental controls

    • Examples given: tuberculosis (TB); measles; varicella; other highly airborne organisms

    • Negative pressure room and room entry controls discussed with a paper-test method for ensuring negative pressure

  • Contact transmission and fomites (indirect contact)

    • Direct contact: skin-to-skin contact or contact with infected bodily fluids

    • Indirect contact via fomites (fulmite/fomite): contaminated inanimate objects like bed rails, door handles, stethoscopes, IV pumps, etc.

    • Examples: MRSA, scabies, C. difficile (C. diff spores)

    • Taking care with surfaces and equipment to prevent indirect transmission

  • Other transmissions and concepts

    • Vector transmission (mosquitoes, ticks): diseases like malaria and Rocky Mountain spotted fever

    • Vehicle transmission: contaminated water or food; importance of safe food/water practices in outbreak settings

    • Direct vs indirect contact vs vehicle vs vector distinctions used for deciding PPE and control measures

  • RSV and dual protection notes

    • RSV often considered as both droplet and contact transmission; in some settings, droplets and contact precautions used together; eye protection considered due to mucous-membrane routes

  • Measurable factors and thresholds highlighted in discussion

    • Distances (droplets) and filtration thresholds (airborne) emphasized as core to deciding PPE and room controls

    • Air exchanges and room pressure (negative pressure) emphasized for airborne pathogens

Donning (Putting On) and Doffing (Taking Off) Procedures

  • Donning sequence (as described in session)

    • 1) Hand hygiene (soap/water or sanitizer; sanitizer duration 15 s15\text{ s}; wash if hands visibly dirty or if C. difficile concerns)

    • 2) Gown: secure at the neck and tie at the back or side for ease of removal

    • 3) Respirator or mask: ensure proper seal with nose piece; adjust straps

    • 4) Eye protection (goggles or face shield)

    • 5) Gloves: put on last, ensuring clean hands stay clean beneath gloves

  • Doffing sequence (as described in session)

    • 1) Gloves first: remove without touching the outside contaminated surface

    • 2) Gown: remove to prevent contact with contaminated outer surface

    • 3) Eye protection: remove carefully (do not touch the front of eye protection; remove from the sides/ear pieces)

    • 4) Respirator or mask: remove after eye protection; avoid touching contaminated front surface

    • 5) Hand hygiene after doffing: wash or sanitize

  • Important doffing notes

    • Doff in a sequence that minimizes exposure to contaminated surfaces

    • Avoid touching contaminated surfaces during removal (especially front of PPE)

    • If there is contact with mucous membranes or skin exposure, wash hands immediately after doffing

  • Training and practice emphasis

    • Rehearse donning and doffing steps to prevent self-contamination

    • Use a stepwise demonstration approach (donning and doffing with peers and instructor feedback)

Specific Pathogens, Precautions, and Scenarios Mentioned

  • Tuberculosis (TB)

    • Transmission: airborne

    • PPE: N95 respirator and gloves; gown as needed depending on exposure risk

    • Environmental controls: negative pressure room and adequate air exchanges (discussed as 6 to 126\text{ to }12 air exchanges per hour) with door-based checks

  • RSV (Respiratory Syncytial Virus)

    • Transmission: droplets and contact concerns; surfaces can harbor the virus longer

    • PPE: droplets or contact precautions; may include gown and gloves; eye protection considered due to mucous membranes

  • MRSA and Scabies

    • Transmission: contact (direct and/or indirect)

    • PPE: gloves and gown; long sleeves recommended for scabies; emphasis on barriers and skin protection

  • C. difficile (C. diff)

    • Transmission: indirect via fomites and spores on surfaces; requires soap and water hand hygiene

  • Influenza and other respiratory pathogens

    • Transmission: droplets and potentially contact via surfaces

    • PPE: typically surgical mask and gloves; gown if contact risk present

  • Measles and Varicella (airborne diseases)

    • Transmission: airborne; require robust airborne precautions

  • General notes on standard vs transmission-based precautions

    • Standard precautions are applied to all patients

    • Transmission-based precautions are added based on suspected or known transmission route (droplet, contact, airborne)

    • Standard precautions remain in effect in addition to transmission-based precautions

  • Practical hospital culture and workflow notes

    • Compliance metrics (e.g., hand hygiene compliance around 90%90\%) influence performance evaluations

    • Ecologies of PPE use vary by unit and patient risk; training and institutional policies guide actual practice

    • Importance of environmental cleaning, surface disinfection, and proper handling of contaminated linen and equipment

Quick Recap and Key Takeaways

  • Droplet vs Airborne distinctions depend on particle size and transmission mechanics

    • Droplets: larger particles, travel short distances (roughly 3 to 6 ft3\text{ to }6\ \text{ft}) and settle quickly

    • Airborne: smaller particles, may stay suspended and travel longer distances; require N95 or higher and environmental controls

  • PPE selection aligns with transmission pathway

    • Droplet: surgical mask + gloves; gown if contact with contaminated surfaces is possible

    • Airborne: N95 respirator + gloves; gown as needed; consider eye protection; negative pressure room for environment control

  • Indirect transmission via fomites is a major infection control concern

    • Common fomites: bed rails, door handles, IV pumps, stethoscopes, etc.

    • Indirect transmission emphasizes hand hygiene and surface disinfection

  • Direct contact transmission focuses on skin-to-skin and secretions

    • Gloves and gown used to block direct contact exposure

  • Donning and doffing require discipline to minimize self-contamination

    • Follow an established sequence; front of PPE is considered dirty; perform hand hygiene at key steps

  • Environmental and policy context matters

    • Negative pressure rooms, air exchanges, and signage; hand hygiene compliance tracked for performance

    • PPE usage and reuse policies may adapt during outbreaks; always align with current guidelines

  • Real-world, ethical, and practical implications

    • PPE shortages and supply constraints influence practice patterns; decisions balance protection with feasibility

    • Education and consistent practice reduce self-contamination and environmental spread; ongoing training is essential

Glossary of Key Terms (quick reference)

  • PPE: Personal Protective Equipment

  • N95: Respirator that provides higher filtration than surgical masks; described as filtering down to 0.2 μm0.2\,\mu\text{m} in the transcript

  • HEPA: High-Efficiency Particulate Air filter

  • Fomite (fulmite in transcript): An inanimate object capable of carrying infectious agents

  • Bypass/negative pressure room: Environment designed to prevent pathogen spread by directing air flow out of the room

  • Standard precautions: Baseline infection control practices applied to all patients

  • Transmission-based precautions: Additional PPE based on suspected transmission route (droplet, contact, airborne)

  • MRSA: Methicillin-Resistant Staphylococcus Aureus

  • RSV: Respiratory Syncytial Virus

  • TB: Tuberculosis

  • C. diff: Clostridioides difficile

  • A/B/C: Abbreviations used in the discussion for transmission modes and protective strategies

  • Micrometer units used in particle sizing: extunitslike0.2 μm,0.5 μm,5 μmext{units like }0.2\,\mu\text{m}, 0.5\,\mu\text{m}, 5\,\mu\text{m}

  • Distances and air exchange thresholds: 3 to 6 ft3\text{ to }6\ \text{ft}; 6 to 12 air exchanges6\text{ to }12\ \text{air exchanges}; 12 cycles12\ \text{cycles} (audience mentions/notes)

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PPE Essentials and Filtration

  • Mask options: Surgical mask filters up to 5 μm5\,\mu\text{m}; N95 respirator filters down to 0.2 μm0.2\,\mu\text{m} for smaller particles. HEPA filters are for airborne containment.

  • Proper mask seal, eye protection (goggles/shields), and managing facial hair are crucial for effectiveness.

  • Gowns protect clothing; don and doff to maintain a clean exterior and prevent self-contamination.

Donning and Doffing Procedures

  • Donning sequence: Hand hygiene → gown → respirator/mask → eye protection → gloves.

  • Doffing sequence: Gloves → gown → eye protection/face shield → respirator/mask → hand hygiene.

  • Always perform hand hygiene for 15 to 20 s15\text{ to }20\text{ s} (soap/water or sanitizer); C. diff requires soap and water.

  • Follow sequence carefully to minimize exposure to contaminated surfaces; front of PPE is considered dirty.

Transmission-based Precautions

  • Standard precautions: Baseline for all patient care.

  • Droplet transmission: Larger particles, travel 3 to 6 ft3\text{ to }6\ \text{ft}. PPE: Surgical mask, gloves; gown if contact risk (e.g., influenza, RSV).

  • Airborne transmission: Smaller particles, remain suspended. PPE: N95 respirator (filters <0.2\,\mu\text{m}), gloves; gown if needed; negative pressure room with air exchanges (e.g., TB, measles).

  • Contact transmission: Direct (skin-to-skin) or indirect via fomites (contaminated objects). PPE: Gloves and gown (e.g., MRSA, C. diff, scabies).

Key Takeaways

  • PPE selection aligns with the transmission pathway: surgical mask for droplets, N95 for airborne.

  • Fomites (e.g., bed rails) are a major concern for indirect contact; emphasize hand hygiene and surface disinfection.

  • Consistent donning and doffing discipline is essential to prevent self-contamination and environmental spread.

PPE Essentials and Filtration

  • Mask options and filtration: Surgical mask filters up to 5 μm5\,\mu\text{m}; N95 respirator filters down to 0.2 μm0.2\,\mu\text{m}; HEPA is for airborne containment.

  • Proper seal on masks (nose bridge, soft rim), eye protection (goggles/shields), and managing facial hair are critical for effectiveness.

  • Gowns protect clothing and skin; proper tying and removal prevent contamination.

Donning and Doffing Procedures

  • Donning sequence: Hand hygiene (15 to 20 s15\text{ to }20\text{ s}; soap/water for C. diff)

    1. Gown

    2. Respirator/mask

    3. Eye protection

    4. Gloves

  • Doffing sequence:

    1. Gloves

    2. Gown

    3. Eye protection/face shield

    4. Respirator/mask

    5. Hand hygiene (post-doffing)

  • Always avoid touching the contaminated front of PPE during removal to prevent self-contamination.

Transmission-based Precautions

  • Standard precautions: Baseline for all patient care.

  • Droplet transmission: Larger particles, travel 3 to 6 ft3\text{ to }6\ \text{ft}. PPE: Surgical mask, gloves; gown if contact risk (e.g., influenza, RSV).

  • Airborne transmission: Smaller particles, remain suspended. PPE: N95 respirator, gloves; gown as needed; negative pressure room with air exchanges (e.g., TB, measles, varicella).

  • Contact transmission: Direct (skin-to-skin) or indirect via fomites (contaminated objects). PPE: Gloves and gown (e.g., MRSA, C. diff, scabies).

  • Other transmissions: Vector (mosquitoes, ticks) and Vehicle (contaminated food/water).

Key Takeaways

  • PPE selection is guided by the transmission pathway (surgical mask for droplets, N95 for airborne).

  • Fomites (e.g., bed rails) are significant for indirect transmission; hand hygiene and surface disinfection are crucial.

  • Diligent donning and doffing (following sequence, avoiding contaminated surfaces) are essential to prevent self-contamination and environmental spread.

  • Environmental controls like negative pressure rooms and air exchanges (6 to 126\text{ to }12 per hour for TB) are vital for airborne pathogens.

  • Institutional policies on PPE use and reuse, especially during outbreaks, must be followed.