Infection control & Isolation

Introduction to Infection Control

  • Case Study: Evie, 72, recovering from knee surgery and has dementia, needs a sterile bedpan replacement.

Importance of Sterility in Procedures

  • Sterile Procedure: Free from bacteria; all actions taken to prevent infection.

  • Need for Two RNs:

    • One manages the sterile catheter, the other the non-sterile tasks.

    • Allows for communication and preserving sterile technique by having a second person to verify actions.

Chain of Infection

  • Definition: A sequence of events that allows an infection to occur.

  • Key Components:

    • Infectious Agent: Bacteria, viruses, parasites, etc.

    • Reservoir: Where the agent lives (humans, animals, food).

    • Portal of Exit: The way the infectious agent leaves the reservoir (blood, saliva, etc.).

    • Mode of Transmission: How the agent spreads (direct contact, droplets, etc.).

    • Portal of Entry: How the agent enters the new host (skin cuts, respiratory tract, etc.).

    • Susceptible Host: An individual with a weakened immune system or no prior exposure to the infectious agent.

Components of the Chain of Infection

Infectious Agent

  • Examples: Bacteria, viruses, fungi, parasites.

Reservoir

  • Examples: Humans, animals, food – where germs reside.

  • Salmonella: Can exist on contaminated food.

Portal of Exit

  • Methods:

    • Mouth (vomit/saliva).

    • Open wounds (cuts).

    • Genital secretions (diapering).

Mode of Transmission

  • Types:

    • Contact (Direct & Indirect): Shaking hands or touching contaminated surfaces.

    • Droplet Spread: Sneezing, coughing, conversation.

    • Airborne: Tiny droplets that linger in the air.

Portal of Entry

  • Methods:

    • Mouth, cuts, eyes, mucosal membranes.

Susceptible Host

  • Who is Susceptible:

    • Infants, elderly, immunocompromised individuals ( AIDS, cancer patients).

  • Factors: Age, nutritional status, chronic diseases, lack of vaccines.

Prevention of Infection Transmission

  • Hand Hygiene: Essential at all stages to break the chain of transmission.

    • Wash hands before/after patient contact, after exposure to body fluids, and after touching contaminated surfaces.

Chain of Infection Dynamics Using Evie’s Case

  • Links:

    • Infectious Agent: Bacteria introduced via catheter.

    • Reservoir: Evie herself (post-operative condition).

    • Portal of Exit: Urinary tract during catheter insertion.

    • Mode of Transmission: Direct contact during care, possibly via surfaces.

    • Portal of Entry: Where bacteria could enter into the urinary system.

    • Susceptible Host: Elderly patients, as her immune system may be compromised.

Assessing for Infection in Nursing

  • Signs of Infection: Fever, change in mental status, localized pain/redness, general malaise.

    • Always consider if symptoms indicate a healthcare-associated infection (HAI).

Stages of Infection

  1. Incubation Period: Infection enters the body but no symptoms are present.

  2. Prodromal Period: Early signs appear; not definitive.

  3. Invasive Stage: Full manifestation of symptoms.

  4. Decline Stage: Symptoms start to reduce; body fights infection.

  5. Convalescence Stage: Recovery phase; health returns.

Significance of Immune Response

  • Physical and Chemical Barriers

    • Skin as a barrier to pathogens; stomach acids kill bacteria.

    • Mucus membranes trap pathogens and cilia sweep them away.

  • Nonspecific Immunity:

    • Neutrophils and macrophages respond to all invaders indiscriminately.

  • Specific Immunity:

    • Antibodies target specific pathogens based on prior exposure or vaccination.

Hand Washing Protocols

  • Critical at every stage of patient care.

  • Specifically emphasized:

    • Before touching a patient, doing a procedure, handling food, and after exposure to bodily fluids.

Asepsis Definitions

  • Medical Asepsis: Reduction of pathogens through techniques such as hand hygiene.

  • Surgical Asepsis: Complete elimination of all microorganisms, applied in sterile procedures.

Key Takeaways

  • Understanding the chain of infection allows for better prevention strategies.

  • Infection control is paramount in healthcare settings to protect vulnerable populations.

  • Reinforcing hand hygiene and aseptic techniques reduces the occurrence of healthcare-associated infections.