Comprehensive Study Guide on Infection Prevention and Clinical Precautions

Examination and Course Overview

• The upcoming exam typically consists of approximately $70$ to $75$ questions.
• Students are allotted a total of $90\,\text{minutes}$ to complete the examination.
• Content distribution for the exam is as follows:
  • Patient Assessment: This constitutes the majority of the test material.
  • Infection Prevention: This section encompasses approximately $30$ to $40\,\text{questions}$.
  • Quality Control, Patient Safety, and Communication: Approximately $6$ to $7\,\text{questions}$.
  • Medical Information Management: Approximately $7$ to $10\,\text{questions}$.

Introduction to Precautions

• Precautions are clinical protocols used to protect both healthcare workers and patients from the transmission of pathogens.
• There are two primary categories of precautions:
  • Standard Precautions (formerly known as Universal Precautions): Applied to all patients regardless of their infection status.
  • Transmission-Based Precautions: Applied to patients known or suspected to be infected with specific, highly transmissible pathogens.

Standard Precautions

• Definition: The concept that all blood and body fluids (with the exception of sweat) should be treated as if they are potentially infectious.
• Historical Context: The term "Universal Precautions" gained prominence in the 1970s and 1980s during the rise of the HIV epidemic. In 1996, the CDC expanded these concepts into the current "Standard Precautions."
• Application: These are the minimum infection prevention practices applicable to all patient care. They include:
  • Use of Personal Protective Equipment (PPE) such as gloves, gowns, masks, and protective eyewear.
  • Hand hygiene.
  • Sharp safety (needles and scalpels).
  • Proper cleaning of environmental surfaces.
  • Respiratory hygiene and cough etiquette.
  • Appropriate patient placement.
• Anticipated Exposure: The level of protection used is dependent upon the anticipated exposure to blood and body fluids.
  • For example, simply looking at a ventilator screen may require no PPE.
  • Listening to breath sounds requires gloves as it involves physical contact with the patient and their environment.
  • Obtaining a sputum sample may require gloves, a hair cap, and a gown.

Hand Hygiene Protocols

• Hand hygiene is the most critical step in breaking the cycle of infection.
• Methods:
  • Hand washing: Using soap and water. Soaps act as surfactants, physically removing pathogens and rinsing them down the drain.
  • Hand rubbing: Using alcohol-based gels, foams, or sanitizers that do not require water. These kill the germs directly on the skin. The drying process of the alcohol is what effectively kills the pathogens.
• Duration:
  • CDC recommendation: $20-30\,\text{seconds}$.
  • World Health Organization (WHO) recommendation: $40-60\,\text{seconds}$.
  • Neonatal Intensive Care Unit (NICU) scrub-in: $3\,\text{minutes}$, extending up to the elbows.
• Effectiveness Inhibitors: Length of nails, nail polish (especially chipped), and extensive jewelry can reduce hygiene effectiveness. Chipped polish provide edges where bacteria can reside. Many hospitals, particularly in the NICU, prohibit fake nails or gel polish.
• Indications for Hand Hygiene:
  • Immediately before touching a patient.
  • Before performing an aseptic technique or handling invasive devices.
  • After touching a patient or their immediate environment.
  • After contact with blood, body fluids, or contaminated surfaces.
  • Before moving from a soiled body site to a clean body site on the same patient.
  • Immediately after removing gloves.
  • When hands are visibly soiled (soap and water must be used in this case).
• Washing Technique:
  • Wet hands with water.
  • Apply enough soap to cover all surfaces.
  • Rub palm to palm.
  • Rub the back of each hand with the opposite palm and interlaced fingers.
  • Rub palm to palm with fingers interlaced.
  • Rub the backs of fingers to opposing palms with fingers interlocked.
  • Rotational rubbing of the thumbs and the webbed space.
  • Rub the tips of fingers in the center of the opposite palm.
  • Rinse with water in a downward motion.
  • Dry with a single-use towel and use the towel to turn off the faucet.

Personal Protective Equipment (PPE)

• PPE selection is based on the interaction with the patient and possible modes of transmission.
• Donning Sequence (Putting on):
  1. Gown: Must be secured at the neck and the back.
  2. Mask (Surgical or N95).
  3. Goggles or Face Shield: Necessary if splatter is anticipated.
  4. Gloves: Must cover the wrists; often used in conjunction with gown thumb holes for a complete seal.
• Doffing Sequence (Removing):
  1. Gown and Gloves: These can be removed simultaneously by pulling the gown from the front and rolling it into a "bolus" so the contaminated surfaces are contained inside.
  2. Goggles or Face Shield.
  3. Mask.
  4. Hand Hygiene: Performed immediately after all items are removed.
• Disposal: PPE must be disposed of inside the patient's room or immediately outside to prevent carrying infectious material into hallways.
• Specific Mask Types:
  • Surgical Masks: Used for standard and droplet precautions; often have ear loops or ties.
  • N95 Respirators: Block approximately $95\,\%$ of particles that are $0.3\,\mu\text{m}$ in size or larger. They require a tight fit and mandatory fit-testing (based on size, weight loss, or weight gain).
  • Powered Air Purifying Respirators (PAPRs): A battery-operated system that supplies purified air to a full face mask. Required for individuals with significant facial hair (beards) who cannot achieve a seal with an N95.

Sharps Safety and Disposal

• General Rule: Never recap a needle. Recapping increases the risk of accidental needle sticks and exposure to bloodborne pathogens.
• Recapping Exceptions: If recapping is absolutely necessary, it must be performed using a surface (the scoop method) to minimize hand proximity to the needle.
• Safety Devices: Tools such as needle guards (flip-covers) or blunt-tipped needles should be used.
• Disposal: Sharps containers should be used for all needles and scalpels.
  • Containers are typically replaced when they are $3/4$ full.
  • Never reach into a sharps container to retrieve items.
  • If a mistake is made (e.g., dropping a sample in the bin before testing), a new stick must be performed; the item is considered lost.

Transmission-Based Isolation Protocols

• Contact Precautions:
  • Used for organisms spread by direct or indirect contact (e.g., MRSA).
  • PPE: Gown and gloves for all interactions.
  • Equipment: Use dedicated disposable equipment (e.g., disposable stethoscopes). If a personal stethoscope is used, it should be covered with a glove and thoroughly cleaned with bleach/disinfectant.
• Contact Precautions Plus:
  • Specifically used for Clostridium difficile (C. diff).
  • Alcohol-based sanitizers do not kill C. diff spores.
  • Required: Hand washing with soap and water; cleaning equipment with bleach or sporicidal agents.
• Droplet Precautions:
  • Used for pathogens spread through large respiratory particles ($> 5\,\mu\text{m}$) that settle within $3-5\,\text{feet}$.
  • PPE: Mask and eye protection for close contact.
  • Transport: The patient must wear a surgical mask during transport (N95 is not required).
  • Examples: Influenza, Pertussis (whooping cough), Adenovirus, COVID.
• Airborne Precautions:
  • Used for pathogens that remain suspended in the air over long distances.
  • PPE: N95 respirator or PAPR. The patient must wear a surgical mask during transport.
  • Environment: Negative pressure room with $6-12\,\text{air changes/hour}$ and a HEPA filter exhausted to the outside.
  • Examples: Tuberculosis (TB), Measles, Smallpox, Ebola.
  • Note: Chickenpox (Varicella) and Herpes Zoster require both Airborne and Contact precautions.
• Protective Environment (Neutropenic Precautions):
  • Used for immunocompromised patients (oncology, organ/stem-cell transplants).
  • Goal: Minimize fungal and spore counts.
  • Restrictions: No fresh flowers, no plants, and no fresh fruits.

Specimen Handling and Transport

• Specimens include sputum, blood, and body fluids.
• Labeling Requirements: Every specimen must be labeled with the patient's name, date of birth (or medical ID), date, time of collection, and location (e.g., ED or specific ward).
• Containment: Use sturdy, leak-proof plastic containers with secure lids. Specimens from isolation rooms must be placed in a biohazard bag.
• Glove Etiquette: Gloves may be worn while carrying a specimen in the hallway, but otherwise, gloves should be removed before exiting a patient's room. Never chart while wearing gloves.

Surveillance and Infection Control

• Surveillance: The ongoing process of monitoring acquisition and colonization of pathogens in both patients and personnel.
• Healthcare-Associated Infections (HAI): Monitoring includes:
  • CLABSI: Central Line-Associated Bloodstream Infections.
  • CAUTI: Catheter-Associated Urinary Tract Infections.
  • VAP: Ventilator-Associated Pneumonia (occurring $24-48\,\text{hours}$ after intubation).
  • VAE: Ventilator-Associated Events.
• Public Health Reporting: Certain infections must be reported to the CDC and State Departments of Health.
• Case Study: A hospital identified an unusual bacterial infection tracked by the CDC, which eventually revealed that a specific brand of alcohol swabs was contaminated at the factory level.

Questions & Discussion

• Question: Is there a specific patient placement example for standard precautions?
• Answer: For standard trauma like broken bones, a regular room is fine. However, if a patient presents with symptoms such as night sweats, weight loss, and a cough, they should be placed in a negative pressure room as a standard precaution until tuberculosis is ruled out.
• Question: When taking off PPE involving foot protectors (booties), when do you remove them?
• Answer: Booties should be removed with gloves on because they have been on the floor. Ideally, take them off, hold them in the gloved hand, and then remove the gown so they are wrapped inside the bundle.
• Question: What was the specific size measurement for the N95 mask?
• Answer: It blocks $95\,\%$ of particles that are $0.3\,\mu\text{m}$ or larger.