High Hazard Procedures Are Aerosol Generating Procedures

High Hazard Procedures: Understanding Aerosol Generating Procedures in Healthcare Settings

Aerosol generating procedures (AGPs) represent a significant category of high hazard procedures in healthcare settings that pose increased risks of pathogen transmission to healthcare workers and patients. These procedures, by their very nature, create aerosols—tiny particles that remain suspended in the air and can travel over distances, potentially carrying infectious agents. Understanding which procedures are classified as aerosol generating and implementing appropriate infection control measures is essential for maintaining safety in healthcare environments, particularly during infectious disease outbreaks or pandemics.

What Are Aerosol Generating Procedures?

Aerosol generating procedures are medical interventions that can produce respiratory secretions in the form of aerosols or droplet nuclei. These particles are typically smaller than 5 micrometers in diameter and can remain suspended in the air for extended periods, traveling farther than larger droplets that fall to the ground quickly. The aerosolized particles may contain pathogens such as viruses, bacteria, or fungi, creating a risk of airborne transmission to nearby individuals.

The classification of procedures as aerosol generating has evolved over time, particularly with the emergence of new pathogens and growing evidence about transmission routes. Initially, only a limited number of procedures were considered high risk, but as research has progressed, the list has expanded to include a broader range of interventions that may generate aerosols during their performance.

Why Are AGMPs Considered High Hazard?

Aerosol generating procedures are classified as high hazard due to several factors that increase transmission risk:

1. Airborne transmission potential: The aerosols created can travel beyond the immediate vicinity of the patient, potentially infecting healthcare workers or other patients in the same area or even in different rooms through ventilation systems.

2. Concentration of pathogens: These procedures often involve areas of the body with high pathogen loads, such as the respiratory tract, leading to potentially high concentrations of infectious particles in the generated aerosols.

3. Procedure duration: Many AGPs are performed for extended periods, increasing the time of potential exposure.

4. Healthcare worker proximity: Healthcare workers performing these procedures are typically positioned close to the patient's airway, maximizing their exposure risk.

5. Unpredictable aerosol production: The amount and size distribution of aerosols generated can vary significantly between procedures and even between patients undergoing the same procedure.

Common Examples of Aerosol Generating Procedures

The list of procedures considered aerosol generating varies slightly between different health organizations, but commonly include:

Respiratory Procedures:

• Intubation and extubation
• Bronchoscopy (including flexible and rigid bronchoscopy)
• Open suctioning of the airway
• Manual ventilation
• Nebulizer treatments
• Sputum induction
• High-flow oxygen therapy
• Tracheostomy care and changes

Surgical and Dental Procedures:

• Electrosurgery and laser procedures
• Use of ultrasonic scalers
• Air polishing in dentistry
• Powered surgical instruments (drills, saws)
• Endoscopic procedures with insufflation

Other Medical Interventions:

• Autopsies and post-mortem procedures
• Certain diagnostic imaging procedures involving contrast media
• High-pressure injection of fluids

Infection Control Measures for AGMPs

Implementing dependable infection control measures is critical when performing aerosol generating procedures. These measures should be multi-faceted and include:

Patient Assessment and Preparation:

• Screen patients for potential infectious diseases before performing AGPs
• Isolate patients known or suspected to have communicable diseases
• Minimize the number of healthcare personnel in the room during the procedure
• Ensure patients wear appropriate masks when possible

Engineering Controls:

• Perform AGPs in negative pressure rooms when available
• Ensure proper ventilation system maintenance and function
• Use local exhaust ventilation (e.g., smoke evacuators during surgery)
• Consider using airborne infection isolation rooms (AIIRs) for high-risk procedures

Administrative Controls:

• Schedule AGPs when fewer people are present in the facility
• Implement policies for delaying non-urgent AGPs during outbreaks
• Establish clear protocols for performing AGPs on patients with suspected or confirmed infections
• Provide adequate staffing to minimize procedure duration and worker fatigue

Personal Protective Equipment (PPE) Requirements

Appropriate PPE is essential for healthcare workers performing aerosol generating procedures. The recommended PPE typically includes:

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• Respiratory protection: N95 respirators or higher-level protection (e.g., PAPRs) for all personnel in the room
• Eye protection: Full-face shields or goggles that form a seal around the eyes
• Gowns: Fluid-resistant or impermeable gowns
• Gloves: Single-use medical gloves that are changed between patients and procedures

The specific PPE requirements may vary based on local guidelines, the suspected pathogens involved, and the nature of the procedure being performed.

Environmental Controls for AGMPs

Environmental modifications can significantly reduce the risk of aerosol transmission:

1. Room selection: Use negative pressure rooms with at least 12 air changes per hour when possible
2. Air handling: Ensure proper filtration of recirculated air (HEPA filters recommended)
3. Room clearance: Limit personnel in the room to essential staff only
4. Timing: Schedule AGPs when fewer people are present in the facility
5. Cleaning and disinfection: Implement enhanced cleaning protocols for rooms after AGMPs, especially when performed on patients with known infections

Staff Training and Safety Protocols

Comprehensive staff training is essential for safe performance of aerosol generating procedures:

• Education: All staff should understand which procedures are considered aerosol generating and the associated risks
• Training: Regular training on proper PPE donning and doffing procedures
• Simulation: Practice sessions for high-risk procedures to improve efficiency and reduce duration
• Monitoring: Implement systems to ensure compliance with safety protocols
• Feedback: Create mechanisms for staff to report concerns and suggest improvements

Recent Updates and Guidelines

The COVID-19 pandemic has significantly influenced our understanding of aerosol generating procedures:

1. Expanded AGP list: Many organizations expanded their lists of AGPs based on emerging evidence
2. PPE recommendations: Enhanced respiratory protection requirements became more widespread
3. Ventilation guidelines: Increased focus on ventilation engineering controls
4. Universal precautions: Greater emphasis on treating all patients as potentially infectious when performing AGPs
5. Telemedicine: Increased use of telemedicine to reduce unnecessary AGPs

Frequently Asked Questions About AGMPs

Q: How do I know if a procedure is considered aerosol generating? A: Consult current guidelines from your healthcare facility, local health department, or national health authorities. The list of AGPs may vary between organizations and evolve as new evidence emerges.

Q: Can all aerosol generating procedures be performed safely? A: Yes, with appropriate infection control measures, engineering controls, and proper PPE, AGMPs can be performed safely. The key is implementing multiple layers of protection.

Q: Are there alternatives to aerosol generating procedures? A: In some cases, alternatives may exist. Here's one way to look at it: using a mask with an exhalation valve instead of a nebulizer, or utilizing different diagnostic imaging techniques that don't generate aerosols. Consult with clinical experts to determine appropriate alternatives.

Q: How long do aerosols remain in the air after a procedure? A:

Aerosol particles can remain suspended in the air for varying durations depending on several factors, including particle size, room ventilation, temperature, and humidity. Smaller particles (less than 5 micrometers) can remain airborne for extended periods—potentially several hours—while larger particles tend to settle more quickly. This is why adequate ventilation and air filtration are critical components of infection control following AGMPs.

Q: What is the difference between droplet and airborne transmission? A: Droplet transmission occurs when larger respiratory droplets (typically greater than 5 micrometers) travel short distances (usually less than 1 meter) and land on mucous membranes or surfaces. Airborne transmission involves smaller particles (less than 5 micrometers) that can remain suspended in air for extended periods and travel longer distances. Many AGPs can convert typically droplet-sized particles into smaller aerosol particles capable of airborne transmission.

Q: How should healthcare facilities assess their ventilation for AGMPs? A: Facilities should conduct air exchange rate assessments in rooms where AGPs are performed. The Centers for Disease Control and Prevention (CDC) recommends a minimum of 6 air changes per hour for airborne infection isolation rooms. Portable HEPA filters can supplement existing ventilation systems when adequate HVAC changes cannot be achieved. Regular monitoring and maintenance of ventilation systems is essential to ensure continued effectiveness.

Conclusion

Aerosol generating medical procedures represent a significant consideration in infection prevention and control across healthcare settings. Understanding which procedures generate aerosols, implementing appropriate engineering controls, ensuring proper personal protective equipment usage, and maintaining comprehensive staff training are all essential components of a dependable infection control program.

The landscape of AGP management continues to evolve as new research emerges and our understanding of pathogen transmission improves. Healthcare facilities must remain vigilant, regularly reviewing and updating their policies to reflect current evidence and guidelines. By implementing a multi-layered approach combining administrative controls, engineering controls, and appropriate PPE, healthcare workers can safely perform necessary procedures while minimizing the risk of infectious disease transmission to themselves, colleagues, and patients.

The bottom line: the goal is to balance the delivery of essential medical care with the protection of all individuals within healthcare environments. Through continued education, adherence to established protocols, and commitment to safety, healthcare facilities can effectively manage the challenges associated with aerosol generating procedures while maintaining high standards of patient care.