1.3 Infection Control, Aseptic Technique & Patient Safety

Infection Control, Aseptic Technique & Patient Safety

The Chain of Infection

Understanding how infections spread is crucial for implementing effective preventative measures. Infection control is paramount in the healthcare environment to safeguard both patients and practitioners. The chain of infection consists of six distinct, sequential links:

1. Infectious Agent: Bacteria, viruses, fungi, or parasites capable of causing disease.
2. Reservoir: The environment where the pathogen lives, multiplies, and thrives. This can include humans, animals, contaminated food, water, or inanimate environmental surfaces.
3. Portal of Exit: The pathway by which the pathogen leaves the reservoir (e.g., respiratory tract via coughing, blood, gastrointestinal tract, or skin lesions).
4. Mode of Transmission: How the pathogen travels to a new host. Transmission can be via direct contact, indirect contact (fomites), droplet spread, or airborne dissemination.
5. Portal of Entry: How the pathogen enters the new host (e.g., broken skin, mucous membranes, respiratory tract, or invasive devices like urinary catheters).
6. Susceptible Host: A person at risk of developing the infection. Susceptibility is increased by factors such as compromised immunity, chronic illness, surgical wounds, or the presence of invasive medical devices.

Nursing goal: Break the chain of infection at any link to prevent the spread of disease. Diligent hand hygiene, vaccination, environmental cleaning, and proper use of personal protective equipment (PPE) are effective ways to break this chain.

Hand Hygiene: The First Line of Defense

Hand hygiene is universally recognized as the single most important action to prevent healthcare-associated infections (HAIs). Despite its simplicity, adherence rates require continuous monitoring and reinforcement.

• Alcohol-Based Hand Rubs (ABHR): This is the preferred method for routine hand hygiene if hands are not visibly soiled. Apply the product, rub all surfaces of the hands, including between fingers and around nails, until completely dry (usually 20-30 seconds).
• Soap and Water: Must be used when hands are visibly dirty, contaminated with blood or body fluids, before eating, after using the restroom, and when caring for patients with known or suspected Clostridioides difficile (C. diff) or norovirus. This is because alcohol does not effectively penetrate the protective shells of these spores or certain non-enveloped viruses.

Standard and Transmission-Based Precautions

Standard Precautions

Standard Precautions are the foundational layer of infection prevention. They are used for ALL patients, regardless of their diagnosis or presumed infection status.

• Involves rigorous hand hygiene, safe injection practices, proper handling of contaminated equipment, and the use of Personal Protective Equipment (PPE) (such as gloves, gowns, masks, or eye protection) whenever there is an expectation of possible exposure to infectious material (blood, body fluids, secretions, excretions, non-intact skin, and mucous membranes).

Transmission-Based Precautions

Transmission-Based Precautions are used in addition to Standard Precautions for patients with known or suspected highly transmissible infections.

1. Contact Precautions

• Indication: Used for infections spread by direct or indirect contact with the patient or their environment (e.g., MRSA, VRE, C. diff, Scabies, and Respiratory Syncytial Virus (RSV)).
• PPE Required: Gown and Gloves upon entering the room.
• Patient Placement: Single-patient room preferred. If a single room is unavailable, patients with the same organism may be cohorted. Dedicate patient-care equipment (e.g., stethoscope, blood pressure cuff, thermometer) to the patient.

2. Droplet Precautions

• Indication: Used for pathogens transmitted via large respiratory droplets (> 5 microns) generated through coughing, sneezing, or talking. These droplets travel short distances (typically within 3-6 feet) before settling. Examples include Influenza, Pertussis, Mumps, and Meningococcal meningitis.
• PPE Required: Surgical mask upon entering the room.
• Patient Placement: Single room preferred. If transport is necessary, the patient must wear a surgical mask to contain their respiratory secretions.

3. Airborne Precautions

• Indication: Used for pathogens transmitted via small airborne droplet nuclei (< 5 microns) that remain suspended in the air and travel over long distances on air currents. Examples include Tuberculosis (TB), Measles (Rubeola), Varicella (Chickenpox), and disseminated Herpes Zoster (Shingles).
• PPE Required: Fit-tested N95 respirator or Powered Air-Purifying Respirator (PAPR) worn before entering the room.
• Patient Placement: Airborne Infection Isolation Room (AIIR) with negative air pressure and specialized filtration (HEPA filters).

Aseptic Technique

Asepsis is the absence of disease-producing microorganisms. Nursing practices fall into two broad categories depending on the required level of cleanliness:

Medical Asepsis (Clean Technique)

• Aims to reduce the number of pathogens and prevent their transfer.
• Includes standard practices like hand hygiene, environmental cleaning, and barrier techniques (Standard Precautions).
• Used for routine care such as the administration of oral medications, enemas, tube feedings, and daily hygiene.

Surgical Asepsis (Sterile Technique)

• Aims to eliminate ALL microorganisms, including spores, from an object or area.
• Required for invasive procedures (e.g., inserting urinary catheters, central line dressing changes, surgical procedures, and preparing sterile intravenous medications).
• Principles of Sterile Technique:
  • A sterile object remains sterile only when touched by another sterile object.
  • Only sterile objects may be placed on a sterile field.
  • A sterile object or field out of the range of vision or below the waist is considered contaminated.
  • A sterile object or field becomes contaminated by prolonged exposure to air or moisture (capillary action draws bacteria from unsterile surfaces).
  • The edges of a sterile field or container (typically a 1-inch border) are considered contaminated.

Patient Safety Protocols

Patient safety is a core mandate for all healthcare providers and is integral to nursing practice.

Patient Identification

• Always use at least two patient identifiers (e.g., full name and date of birth, or full name and medical record number) before administering medications, blood products, collecting lab specimens, or performing procedures.
• Never use the patient's room number or bed number as an identifier, as patients frequently move.

Fall Prevention

Falls are a leading cause of adverse events and patient injury in hospitals.

• Conduct fall risk assessments upon admission and routinely thereafter (e.g., using the Morse Fall Scale or Hendrich II Fall Risk Model).
• Interventions: Keep the bed in the lowest position, lock bed and wheelchair brakes, place the call bell within reach, ensure adequate lighting, clear the floor of clutter, provide non-skid footwear, and implement hourly rounding to address the '4 Ps' (Pain, Potty, Positioning, Possessions).

Medication Safety

Adhere strictly to the Rights of Medication Administration: Right Patient, Right Drug, Right Dose, Right Route, Right Time, Right Documentation, Right Reason, and Right Response. Utilizing barcode medication administration (BCMA) systems adds a technological layer of safety but does not replace clinical nursing vigilance.