1.2 Hand Hygiene, Personal Protective Equipment, and Isolation Protocols

1.2 Hand Hygiene, Personal Protective Equipment, and Isolation Protocols

Clinical Core: Preventing healthcare-associated infections (HAIs) requires mastering hand hygiene guidelines, adhering strictly to personal protective equipment (PPE) sequences, and applying targeted Transmission-Based Precautions when Standard Precautions alone are insufficient.

CDC Hand Hygiene Guidelines

Hand hygiene is universally recognized as the single most critical intervention to break the chain of infection in clinical settings.

1. Soap and Water Washing

Handwashing with plain soap or antimicrobial soap and water relies on mechanical friction to lift microorganisms from the skin.

• Indications:
  • When hands are visibly dirty, soiled, or contaminated with blood or body fluids.
  • Before eating and after using the restroom.
  • After caring for patients with suspected or confirmed spore-forming organisms, specifically Clostridioides difficile (C. diff) or Bacillus anthracis (alcohol rubs do NOT destroy bacterial spores).
• Procedure:
  1. Wet hands with warm water (avoid hot water as it increases skin dermatitis risk).
  2. Apply manufacturer-recommended amount of soap.
  3. Rub hands together vigorously for at least 20 seconds, covering all surfaces: palms, backs of hands, interdigital spaces, thumbs, fingertips, and wrists.
  4. Rinse thoroughly under running water with fingertips pointing downward.
  5. Dry completely with clean, single-use paper towels.
  6. Turn off the faucet using a fresh dry paper towel to prevent recontamination.

2. Alcohol-Based Hand Rub (ABHR)

ABHR solutions (containing 60% to 95% ethanol or isopropanol) are the preferred modality for routine decontamination when hands are not visibly soiled.

• Advantages: Fast-acting, superior microbicidal activity against vegetative bacteria and enveloped viruses, requires less time, accessible at point of care, and causes less skin irritation than frequent soap washing.
• Procedure: Apply product to palm of one hand (typically 3–5 mL); rub hands together covering all surfaces until hands are completely dry (usually 15–20 seconds). Do NOT wipe hands with paper towels.

3. Surgical Hand Scrub

Performed prior to assisting with minor surgical procedures or entering sterile fields.

• Duration: Timed 3 to 5-minute scrub using an approved antimicrobial agent (e.g., chlorhexidine gluconate or povidone-iodine) or a specialized alcohol-based surgical rub.
• Key Technique: Scrubbing extends from fingertips up to 2 inches above the elbows. Keep hands held elevated above the elbows at all times during and after the scrub so that water drains from cleanest area (fingertips) to less clean area (elbows). Dry with a sterile towel using separate corners for each arm.

Comparison of Clinical Hand Hygiene Methods

Personal Protective Equipment (PPE) Sequences

PPE acts as a physical barrier protecting healthcare workers from infectious hazards. Correct ordering of donning (putting on) and doffing (removing) prevents self-contamination.

Donning Sequence (Before Entering Patient Area)

1. Gown: Select appropriate size; fully cover torso from neck to knees and arms to end of wrists; fasten securely at neck and waist.
2. Mask or Respirator: Secure ties or elastic bands at middle of head and neck; fit flexible band to nose bridge; fit snug to face and below chin. (Fit-check N95).
3. Goggles or Face Shield: Place over eyes/face and adjust to fit comfortably.
4. Gloves: Extend gloves to cover the wrist cuff of the isolation gown.

Doffing Sequence (At Doorway or Outside Room)

Rule: The outside front and sleeves of gowns, front of goggles/shields, and gloves are CONTAMINATED. The inside of gown, ties, ear loops, and gloves interior are CLEAN.

1. Gloves: Remove using glove-in-glove technique (peel first glove inside-out; slide bare fingers under cuff of second glove and peel off). Discard in proper receptacle.
2. Goggles / Face Shield: Remove from back by lifting head band or ear pieces without touching front surface.
3. Gown: Unfasten ties; peel gown away from neck and shoulders touching inside only; turn gown inside-out; roll into a bundle and discard.
4. Mask / Respirator: Remove from back by touching only bottom ties/elastics, then top ties/elastics. Lift away from face. Note: Remove N95 respirator after exiting the room and closing the door.
5. Hand Hygiene: Perform hand hygiene immediately after doffing all PPE.

Transmission-Based Precautions

Used in addition to Standard Precautions for patients with suspected or confirmed infections caused by highly transmissible pathogens.

1. Contact Precautions

• Target Pathogens: Methicillin-Resistant Staphylococcus aureus (MRSA), Vancomycin-Resistant Enterococcus (VRE), Clostridioides difficile, scabies, major non-enveloped viral infections.
• Required PPE: Don gown and gloves upon entering the room.
• Equipment & Room: Private room preferred; dedicated single-patient equipment (BP cuff, stethoscope, thermometer).

2. Droplet Precautions

• Target Pathogens: Influenza, Neisseria meningitidis, Pertussis (whooping cough), Mumps, Rubella, Group A Streptococcus pharyngitis.
• Required PPE: Surgical mask worn upon entry into patient room. Goggles/face shield if risk of splash exists.

3. Airborne Precautions

• Target Pathogens: Mycobacterium tuberculosis (TB), Measles (Rubeola), Varicella-Zoster (Chickenpox), Disseminated Herpes Zoster.
• Required PPE: NIOSH-approved N95 respirator (or Powered Air-Purifying Respirator [PAPR]) fitted prior to room entry.
• Room Specifications: Airborne Infection Isolation Room (AIIR) featuring:
  • Negative air pressure relative to surrounding corridors.
  • Air exhausted directly to outside or filtered through High-Efficiency Particulate Air (HEPA) filters.
  • Minimum of 6 to 12 air changes per hour (ACH).
  • Room door must remain closed at all times.

N95 Fit Testing and Seal Check

• Annual Fit Testing: Required by OSHA to identify proper mask size/model for each employee's facial features (qualitative using saccharin/bitrex or quantitative particle count).
• User Seal Check: Performed by the medical assistant every single time an N95 is donned:
  • Positive-pressure check: Exhale gently into mask; mask should bulge slightly without air leaking around edges.
  • Negative-pressure check: Inhale deeply; mask should collapse slightly toward face without air leaking in.