Lesson 5.1: Standard and Transmission-Based Precautions

Introduction

In this lesson, we will explore standard and transmission-based precautions, essential components of safety and infection prevention and control in healthcare settings. The objectives of this lesson include:

• Understanding the standard precautions and three transmission categories: contact, droplet, and airborne.
• Learning how to match precautions and personal protective equipment (PPE) to specific conditions.
• Selecting the correct precaution and PPE for given infections.
• Sequencing the correct procedures for donning and doffing PPE.
• Explaining the main ideas and terminology behind standard and transmission-based precautions.

Understanding and implementing these practices is critical in improving patient outcomes, minimizing the spread of infection, and ensuring a safe environment for both healthcare providers and patients.

Standard Precautions

Standard precautions are a set of infection prevention practices designed to protect both healthcare workers and patients. They should be applied to all patients, regardless of their diagnosis or presumed infection status. The core components of standard precautions include:

• Hand hygiene
• Use of personal protective equipment (PPE) when necessary
• Safe handling and disposal of sharps
• Environmental cleaning and disinfection
• Respiratory hygiene and cough etiquette
• Patient placement considerations

Hand Hygiene

Hand hygiene is the cornerstone of infection control. It involves washing hands with soap and water or using an alcohol-based hand sanitizer. Here’s the correct procedure for handwashing:

1. Wet hands with clean, running water (warm or cold), turn off the tap, and apply soap.
2. Lather hands by rubbing them together with the soap. Lather the backs of hands, between fingers, and under nails.
3. Scrub hands for at least 20 seconds.
4. Rinse hands well under clean, running water.
5. Dry hands using a clean towel or air dry them.

Example of Hand Hygiene

Imagine a nurse named Sarah. Before entering a patient’s room, she performs hand hygiene by using an alcohol-based hand sanitizer. After providing care, she washes her hands with soap and water. By adhering to these practices, Sarah minimizes the risk of transferring pathogens to herself and her patients.

Personal Protective Equipment (PPE)

PPE includes items such as gloves, masks, gowns, and goggles. PPE is used to create a barrier against infection. Knowing when to use which type of PPE is essential.

• Gloves: Used during procedures that may expose the hands to blood, body fluids, or contaminated surfaces.
• Masks and Respirators: Used in situations where there is a risk of inhaling infectious agents. Surgical masks are commonly used in droplet precautions, while N95 respirators are used for airborne precautions.
• Gowns: Protect the healthcare worker’s clothing from contamination.
• Goggles and Face Shields: Protect the eyes, nose, and mouth from splashes or sprays of infectious materials.

Transmission-Based Precautions

When Standard Precautions are not sufficient to prevent infection, Transmission-Based Precautions are implemented. These precautions are categorized into three main types:

1. Contact Precautions
2. Droplet Precautions
3. Airborne Precautions

Contact Precautions

Contact precautions are necessary for infections that can be transmitted through direct or indirect contact with an infected individual or their environment. This includes pathogens like Methicillin-resistant Staphylococcus aureus (MRSA) and Clostridium difficile (C. diff).

PPE for Contact Precautions

• Wear gloves when entering the patient’s room.
• Wear gowns to protect clothing from contamination.

Example of Contact Precautions

Consider a situation in which a patient has C. diff infection. The nurse must:

1. Don gloves and gown before entering the room.
2. Perform patient care and potentially come into contact with contaminated surfaces.
3. Remove gloves and gown correctly before leaving the room to prevent contamination of other areas.

Droplet Precautions

Droplet precautions are used to prevent transmission of pathogens that spread through respiratory droplets when a person coughs, sneezes, or talks. Examples of illnesses requiring droplet precautions include influenza, pneumonia, and meningitis.

PPE for Droplet Precautions

• Wear a surgical mask when within 3 feet of the patient.
• Eye protection may be necessary to protect against large droplets.

Example of Droplet Precautions

In a scenario where a patient diagnosed with influenza is in a shared room, nurses should:

1. Put on a mask before entering the room.
2. Maintain a distance of at least 3 feet when interacting with the patient.
3. Remove the mask and perform hand hygiene after exiting the room.

Airborne Precautions

Airborne precautions are necessary for infections that are transmitted through the air via droplet nuclei smaller than 5 micrometers. Conditions requiring airborne precautions include tuberculosis and measles.

PPE for Airborne Precautions

• Wear a fit-tested N95 respirator or powered air-purifying respirator (PAPR).
• Ensure that the patient is in a negative-pressure room, if possible, to prevent airborne transmission.

Example of Airborne Precautions

Imagine a nurse taking care of a patient with tuberculosis:

1. Before entering, the nurse puts on an N95 respirator.
2. The nurse ensures the patient is in a negative-pressure room to minimize risk.
3. After leaving, the nurse appropriately discards or decontaminates the respirator based on policies in place.

Donning and Doffing PPE

Proper donning (putting on) and doffing (removing) of PPE is crucial in preventing cross-contamination. The correct sequence is as follows:

Donning PPE

1. Wash hands or use alcohol-based hand sanitizer.
2. Put on gown, ensuring it covers the body fully.
3. Put on mask or respirator.
4. Apply eye protection (goggles/face shield) if needed.
5. Finally, put on gloves, ensuring they cover the cuffs of the gown.

Doffing PPE

1. Remove gloves first by grasping the outside and turning them inside out as they come off.
2. Perform hand hygiene immediately after glove removal.
3. Remove goggles or face shield by handling only the headband or ear pieces.
4. Remove gown by untieing and rolling it inward to avoid contact with the contaminated exterior.
5. Remove mask or respirator last, touching only the ties or elastic bands, ensuring not to touch the front.
6. Perform hand hygiene immediately after removing all PPE.

Example of Donning and Doffing

Consider our earlier nurse, Sarah. Before entering a patient with contact precautions, she:

1. Washes her hands.
2. Puts on a gown, then a mask, goggles, and finally gloves.

After providing care, she reverses the process, removing gloves, doing hand hygiene, and then removing goggles, gown, and mask in that order, ensuring safety throughout.

Conclusion

Understanding and utilizing standard and transmission-based precautions are fundamental responsibilities for nursing professionals. By effectively employing these practices, nurses safeguard their patients and themselves from infections and contribute to a safer healthcare environment. Mastery of donning and doffing techniques is equally important to prevent the spread of infections. Knowledge of appropriate PPE for various situations is essential, as different pathogens require specific precautions.

Study Notes

• Standard Precautions: Basic infection control that applies to all patients.
• Transmission-Based Precautions: Used in addition to standard precautions; include contact, droplet, and airborne precautions.
• PPE Types: Gloves, masks, gowns, goggles.
• Donning and Doffing Sequence: Follow the prescribed order to minimize contamination risks.
• Importance of Hand Hygiene: Key to preventing infection spread.
• Common Pathogens: Familiarize with diseases requiring each type of precaution.