lab 1

Standard Precautions

• Precautions applied to everyone in health care to reduce exposure to blood and body fluids; not limited to a single patient or situation.

• Core components: hand hygiene and gloves as foundational elements; gloves are worn whenever there is any chance of touching contaminated material or body fluids.

• Bloodborne and other body fluids are the main concerns; standard precautions originated from lessons learned during the HIV/AIDS epidemic in the 1980s.

• Body fluids to treat with standard precautions (even if not visibly contaminated): urine, blood, saliva, feces, vomit, and other droplets that may carry pathogens.

• Glove use rules: do not wear the same pair of gloves between different rooms or patients; change gloves between rooms/patients and perform hand hygiene between patients.

• Historical note: glove use prior to the 1980s was much more limited (e.g., ostomy care often avoided gloves due to shame concerns); now gloves are routine for handling ostomies and any contact with body fluids.

• Transmission-based precautions build on standard precautions for specific infectious diseases depending on the route of transmission.

Transmission-Based Precautions

• Definition: additional precautions used for diseases with specific transmission routes beyond standard precautions.

• Three types:

  • Contact precautions

  • Droplet precautions

  • Airborne precautions

• Personal Protective Equipment (PPE): the type and amount of PPE depend on the transmission route and the likelihood of exposure.

• PPE is reviewed annually and during clinical orientation; always based on CDC guidelines and the organism’s transmission mode.

Body Fluids and Pathogen Focus

• Bloodborne pathogens are a major concern (e.g., HIV, hepatitis) but standard precautions cover a broad range of fluids.

• Other notable pathogens discussed: Clostridioides difficile (formerly Clostridium difficile), MRSA (Methicillin-resistant Staphylococcus aureus), and VRE (vancomycin-resistant Enterococcus).

• Clostridioides difficile (C. diff) is highlighted as a key concern for contact precautions due to diarrhea and environmental shedding.

• The term for C. diff was updated to Clostridioides difficile; shorthand in notes may appear as
  $ext{ ext{Clostridioides difficile}}.$

• C. diff travels easily from room to room via contaminated surfaces and environments; ensure environmental cleaning and contact precautions.

• Other organisms discussed with contact precautions include enterococci and MRSA; VRE is particularly associated with the GI tract and is shed in puke and poop.

• Impetigo is an example of a skin infection discussed; it is caused by streptococcal bacteria and also falls under standard precautions in the exercise presented.

Contact Precautions (Transmission-Based)

• When you must touch the patient or their immediate surroundings (bed, bed rails, bedside table, or items handled by the patient), contact precautions apply.

• Minimum PPE: gown and gloves; hands must be cleaned before and after patient contact.

• These organisms do not travel far on their own and require contact with contaminated surfaces to spread.

• Examples: C. diff, MRSA, VRE, and certain wound infections (e.g., streptococcal, staphylococcal).

• Environmental risk: patient is likely to contaminate the environment and may resist or help in spreading contamination.

• Routine practices include changing blood pressure cuffs between patients (disposable cuffs are used in acute care); each patient typically uses their own cuff for the admission.

Droplet Precautions

• Used for diseases that spread mainly through large droplets that travel a limited distance.

• Typical transmission distance:
  $6\text{ ft}$ (approximately six feet) from the patient.

• PPE typically includes gown and gloves; a surgical mask may be added, and eye protection if there is a risk of splashes or if the patient has a higher sneeze risk (e.g., trunk symptoms or dementia with unpredictable movements).

• Classic examples: meningitis (transmitted via sneezing), Bordetella pertussis (whooping cough), influenza.

• Flu vaccines are mandatory for clinical participation; vaccination is due by September in the course context (Complio requirement; exemptions removed).

• Droplet precautions do not require negative pressure rooms; maintain distance and appropriate barrier protection when within ~$6\text{ ft}$ of the patient.

• If a patient with droplet precautions must be transported, the patient should wear a mask in the hallway.

Airborne Precautions

• Used for pathogens that stay suspended in air and travel long distances via air currents.

• Classic airborne diseases: tuberculosis (TB), chickenpox (varicella); COVID-19 is discussed as behaving like an airborne disease with some droplet transmission.

• Airborne precautions require: a negative-pressure room and appropriate PPE.

• Negative-pressure room details:

  • The room is designed so that air is vented directly to the exterior when the system is on.

  • Doors must remain closed when a patient is in an airborne room to maintain ventilation and containment.

  • An indicator (e.g., a meatball/mechanical alarm) signals when the room is under negative pressure; opening the door can disrupt this.

• PPE for airborne: typically an N95 respirator (particulate respirator) or higher; staff must be fitted for the respirator size.

• Note for students: N95s are often not issued to students due to cost and supply; staff have priority; beards interfere with proper seal of the respirator; discussion of beard management (Van Dyke) to improve fit.

• Transporting an airborne patient requires that the patient wear a mask in the hallway; transport personnel do not typically wear full airborne PPE when transporting.

PPE Essentials and Practice Considerations

• PPE should be donned entirely outside the room in many facilities, unless the room is airborne and requires different procedures.

• Tradition campus rooms include a dedicated safe zone with PPE and sink located in the room; other facilities place PPE outside the room or on a wall near the door.

• Do not remove PPE while in hallways; do not roam in PPE as a visitor; PPE should stay in the room unless you are leaving the area after patient care.

• Eye protection and masks are added if there is a risk of splashes, coughing, or certain patient conditions (e.g., dementia with unpredictable sneezing).

• Post-encounter PPE doffing is essential to minimize self-contamination; hands should be cleaned after removing gloves and gown, and again after doffing the mask or eye protection as appropriate.

• Blood pressure cuffs: the trend toward single-use cuffs at discharge or infection-prone areas; cuffs are not reused between patients for infection control.

• PPE check-ins during clinical rotations: infection prevention staff conduct “secret shopper” style audits to assess hand hygiene, hand sanitizer use, and PPE practices; you may see staff with a clipboard monitoring adherence.

Practical Scenarios and Case Examples

• Scenario: A patient with cough, fever, night sweats, and unintended weight loss presenting to ED may indicate TB; apply airborne precautions (negative-pressure room, N95 fit, patient mask in hallways).

• Scenario: An elderly patient with wound drainage after hip surgery; likely requires contact precautions (gloves and gown, plus standard precautions).

• Scenario: A patient with diarrhea and a history of antibiotic exposure; consider C. diff transmission and implement contact precautions; ensure environmental cleaning and contact precautions because C. diff spreads through contaminated surfaces.

• Scenario: A patient with influenza-like illness during flu season; apply droplet precautions (surgical mask for the patient, surgical/procedure mask for visitors, and PPE as needed).

• Scenario: A patient with impetigo (streptococcal skin infection) is managed with standard precautions in the exercise; contact precautions may be used depending on local policy.

Key Takeaways for Boards and Practice

• Always distinguish between standard precautions and transmission-based precautions; use standard precautions for all patients and add precautions based on transmission route.

• The three transmission-based categories are Contact, Droplet, and Airborne, each with specific PPE and room requirements.

• Important numbers and concepts to memorize:

  • Droplet transmission distance: $6\text{ ft}$

  • Airborne rooms use negative pressure and doors must remain closed.

  • N95 respirators require proper fit testing; beards can hinder fit and may require alternative facial hair options or shaving to ensure a seal.

• Common organisms and their precautions:

  • MRSA, VRE, C. diff: Contact precautions

  • Meningitis, pertussis, influenza: Droplet precautions

  • TB, chickenpox, certain forms of COVID-19: Airborne precautions (with room and respirator requirements)

• Always enforce hand hygiene and proper glove use; never reuse gloves between patients; ensure gloves and gown are used appropriately when there is potential contact with contaminated surfaces.

• Transport and patient movement require communication about precautions so that receiving and transport teams can prepare and minimize exposure.

• Institutions may differ in the exact placement and availability of PPE, so know your local protocol; in some settings PPE is readily accessible in the room, while in others it must be donned outside the room.

• Regular training and annual refreshers ensure up-to-date practices consistent with CDC guidelines and prevent healthcare-associated infections.

Quick Reference: Common Terms and Definitions

• Standard precautions: precautions used for all patients to prevent exposure to blood and body fluids.

• Transmission-based precautions: additional precautions based on disease transmission route (Contact, Droplet, Airborne).

• PPE: Personal Protective Equipment (gloves, gown, mask, eye protection, and respirators such as N95).

• Negative pressure room: ventilation system that directs air outside the building to prevent contaminated air from escaping.

• Clostridioides difficile (C. diff): a gut pathogen causing diarrhea; spread via contact; now referred to as Clostridioides difficile in modern nomenclature.

• MRSA: Methicillin-resistant Staphylococcus aureus; a common contact precaution organism.

• VRE: Vancomycin-resistant Enterococcus; GI tract organism requiring contact precautions.

• Impetigo: skin infection often caused by streptococci; managed under standard precautions.

• Local practice nuances: room setup, PPE placement, and transport policies may vary by institution; always follow local guidelines and signage.