Infection Control and Isolation

Infection Control and Isolation

Learning Objectives

  • Examine the elements of the chain of infection and the body’s defenses.

  • Describe the manifestations of the inflammatory response, local and systemic infections, and related diagnostic tests.

  • Relate principles of medical and surgical asepsis and their applications to client care.

  • Differentiate between standard precautions and various types of isolation precautions.

  • Identify nursing interventions that can protect against infection.

Scope of Practice

  • The scope of practice differs between Registered Nurses (RNs) and Practical Nurses (PNs).

  • Differences include:

    • States allow different levels of participation in care plans by PNs.

    • Clinical supervision is typically required for PNs.

  • PN students should align learning with state-specific guidelines for safe practice.

Introduction

  • Focuses on the components of the chain of infection and body’s defenses against infections.

  • Describes defensive mechanisms triggered by infectious agents, how they manifest, and diagnostic tests associated.

  • Explores infection control principles and nurses' roles in supporting defenses:

    • Standard and specific precautions

    • Treatments and interventions to break infection chain.

Chain of Infection and the Body's Defenses

Chain of Infection

  • A sequence in which infections occur, comprising:

    • Infectious Agent: Bacterium, virus, fungus, or parasite capable of causing disease.

    • Reservoir: The habitat where the infectious agent lives (animate or inanimate).

    • Portal of Exit: The route through which the pathogen exits the reservoir.

    • Mode of Transmission: The method through which the pathogen spreads to a new host.

    • Portal of Entry: The site where the pathogen enters the susceptible host.

    • Susceptible Host: A person capable of becoming infected.

Breaking the Chain

  • Infectious Agent: Require destruction to halt infection—antimicrobial treatments or sanitation practices needed.

  • Reservoir: Hand hygiene and cleaning environments disrupt pathogen habitats.

  • Portal of Exit: Containing body fluids and minimizing spread from infected sites.

  • Modes of Transmission: Burden can be lowered through hygiene and protective barriers (e.g., gloves).

  • Portal of Entry: Protective measures must prevent pathogens from accessing the body.

  • Susceptible Host: Immunizations and good health practices enhance the body’s defenses against infections.

Modes of Transmission

  • Different transmission methods:

    • Contact Transmission: Direct (from person to person) or indirect (via contaminated objects).

    • Droplet Transmission: Infectious droplets from a cough/sneeze.

    • Airborne Transmission: Pathogens in smaller airborne particles that can travel long distances.

    • Vehicle Transmission: Contaminated items (e.g., food, water).

    • Vector-Borne Transmission: Spread by insects or animals.

Body Defenses

  • Mechanisms include:

    • Physical and Chemical Barriers: Skin and mucous membranes protect against entry of pathogens.

    • Nonspecific Immunity: White blood cells like neutrophils and macrophages destroy invading microbes.

    • Specific Immunity: Antibodies and lymphocytes target specific pathogens.

Inflammatory Response and Infections

Inflammatory Response

  • Triggered by injury or infection, involves:

    1. Recognition of harmful stimuli.

    2. Activation of inflammatory pathways.

    3. Release of markers for inflammation.

    4. Mobilization of inflammatory cells.

Manifestations of Inflammation

  • Signs include:

    • Heat

    • Redness

    • Swelling

    • Pain

    • Loss of function

Stages of Infection

  1. Incubation Stage: Time between exposure and symptom onset.

  2. Prodromal Stage: Initial nonspecific symptoms.

  3. Acute Illness Stage: Specific symptoms and peak severity of infection.

  4. Decline Stage: Reduction in symptoms and return to health.

  5. Convalescence Stage: Full recovery.

Types of Infection

  • Local Infections: Confined to one area; treated with topical therapies.

  • Systemic Infections: Spread through bloodstream; may require intravenous antibiotics.

Diagnostic Tests

  • Necessary for identifying infections; can include urinalysis, cultures, blood tests, imaging studies, and lab tests focusing on WBC counts and markers of inflammation.

Principles of Medical and Surgical Asepsis

Hand Hygiene

  • Essential in preventing transmission of pathogens and maintaining asepsis:

    • Ensure cleanliness through various handwashing methods, including antimicrobial soaps and alcohol-based sanitizers.

Medical Asepsis

  • Reduces the number of pathogens to minimize infection risk. Isolation precautions embody medical asepsis principles.

Surgical Asepsis

  • Involves procedures to ensure sterility, such as proper scrubbing and handwashing to prevent surgical site infections.

Standard and Isolation Precautions

  • Standard Precautions: Applied universally to prevent transmission; includes PPE and hygiene.

  • Contact Precautions: Prevent spread through touch; clients with certain pathogens require these.

  • Droplet Precautions: Guard against infections spread by respiratory drops.

  • Airborne Precautions: Used for infections that travel through the air; requires specialized room settings and PPE (N95 masks).

Infection Control Bundles

  • Care guidelines aimed at preventing infections; utilize coordinated best practices for handling devices and hygiene.

Multidrug-Resistant Infections (MDROs)

  • Infections caused by organisms resistant to multiple antimicrobials; require stringent infection control and methods to reduce transmission risk.

Personal Protective Equipment (PPE)

  • Nurses must understand and apply various PPE methods appropriate to the infection risk:

    • Gloves: For contact with blood, body fluids, etc.

    • Gowns: Used when contact with infectious materials is possible.

    • Masks: Required for droplet and airborne precautions.

Nursing Interventions to Protect Against Infection

  • Focus on education, adhering to protocol, monitoring hygiene practices, and using awareness of infection principles to reduce risks across health care settings.