INFECTION

Infection Control Overview

  • This chapter reviews infection control measures necessary for safeguarding patients and healthcare providers within medical settings.

Disease Producing Pathogens

  • Definition: Organisms that can cause disease, leading to illness in humans.

  • Types of organisms include:
      - Bacteria
      - Viruses
      - Fungi
      - Protozoans

  • Key point: Bacteria and viruses are the most common pathogens encountered in medical practice.

Modes of Transmission

  • Infections can spread through the following modes:
      - Airborne Transmission: Pathogens suspended in the air that can be inhaled.
      - Contact Transmission: Pathogens transferred via physical contact.
      - Droplet Transmission: Pathogens spread through droplets from the respiratory tract of an infected person.

Infection Prevention Strategies

  • Hand Hygiene: The most critical practice for preventing the spread of infections.

  • Respiratory Etiquette: Covering the mouth and nose when coughing or sneezing, followed by proper hand hygiene.

The Body's Defense Mechanism

  • Physical Barriers:
      - Skin: Acts as a primary physical barrier against pathogens. Must be intact (no tears or open wounds) to be effective.
      - Mucous Membranes: Include oral mucosa which can also provide a barrier, prevent entry of pathogens.

  • Normal Flora: Beneficial microorganisms naturally occurring in the body, providing a defense against pathogenic organisms.

  • Chemical Barriers:
      - Acids and enzymes present in bodily secretions (like saliva, tears, and sweat) that help to neutralize harmful pathogens.
      - Cilia: Hairlike structures that trap and eliminate pathogens, particularly in the respiratory tract.
      - Lysosomes: Organelles responsible for breaking down the debris of dead cells and destroying pathogens.

Immune System Responses

  • Innate Immunity: Natural resistance to infections present from birth.

  • Acquired Immunity: Immunity developed over time through exposure to infections or vaccinations.
      - Antibodies: Proteins produced by the immune system that help neutralize or destroy pathogens.
      - Phagocytosis: The process where certain immune cells (macrophages) engulf and digest pathogens.

Inflammatory Response

  • Signs and Symptoms:
      - Redness
      - Heat
      - Swelling
      - Pain

  • Purpose: To localize and eliminate pathogens, preventing the spread of infection.

  • Other symptoms that might occur during inflammation include:
      - Fever
      - General malaise (tiredness)

Chain of Infection

  • Stages:
      - Agent: The infectious microorganism.
      - Host: The environment or individual where the organism resides.
      - Mode of Transmission: The way the pathogen is transmitted (droplets, contact, etc.).

Standard and Transmission-Based Precautions

  • Standard Precautions:
      - Hand hygiene, use of gloves, and appropriate protective equipment (PPE) to prevent infection spread.

  • Transmission-Based Precautions (specific to the mode of transmission):
      - Airborne Precautions: N95 respirators and face shields for diseases like TB, measles.
      - Contact Precautions: Gloves and gowns for MRSA, C. Diff infections.
      - Droplet Precautions: Masks, gowns, gloves for conditions like flu and adenovirus.

  • COVID-19 considerations: Having modified contact-droplet precautions depending on clinical guidelines.

Personal Protective Equipment (PPE)

  • Key components include:
      - Gloves
      - Gowns
      - Facemasks and respirators
      - Eye protection

  • Importance of checking for latex allergies when using gloves.

Healthcare-Associated Infections (HAIs)

  • Infections occurring in a healthcare setting, monitored and reported to health authorities.

  • Common types of HAIs include:
      - Hospital-acquired pneumonia
      - Catheter-associated urinary tract infections (CAUTIs)
      - Central line-associated bloodstream infections (CLABSIs)

Preventing HAIs

  • Ensuring sterile procedures, monitoring insertion techniques for devices, and promoting hygiene measures.

  • The significance of timely reporting and interpreting lab results.

Multidrug-Resistant Organisms (MDROs)

  • Examples include certain strains of Staphylococcus, C. Diff, and Streptococcus.

  • Importance of obtaining blood cultures before administering antibiotics to identify pathogens correctly.

Infection Surveillance and Reporting

  • Reporting new infections, especially indicated by temperature elevations and changes in mental status.

  • Requires vigilant monitoring of vital signs and symptoms.

Asepsis in Infection Control

  • Medical Asepsis: Practices aimed at reducing, but not completely eliminating, microorganisms.
      - Includes all standard hygiene practices.

  • Surgical Asepsis: Complete elimination of microorganisms, requiring sterile techniques for invasive procedures.

Sepsis and Septic Shock

  • Septic shock arises from a systemic inflammatory response to a bacterial infection, characterized by:
      - Elevated heart rate (usually greater than 100 bpm) and tachypnea.
      - Potential for multi-organ failure without timely intervention.

Patient Assessment and Planning

  • Utilize subjective data (patient communication) and objective data (clinical assessments) to support patient care.

  • Special focus on older adults due to their rapid deterioration in infection settings, emphasizing prompt reporting of symptoms.

Evaluation and Community Considerations

  • At patient discharge, educate on infection transmission and safe practices.

  • Assess home care practices and ensure follow-up arrangements are in place to monitor health post-discharge.

Home Care Practices

  • Use of proper hygiene and gloves, especially during invasive care.

  • Education regarding safe food handling and general health maintenance for the patient in their home environment.

  • Emphasize the importance of maintaining a clean environment to mitigate the risk of infections spreading among vulnerable populations, particularly in long-term care settings.