Negative Pressure Rooms
Negative Pressure Rooms
A negative pressure room is a volumetric space in which the internal atmospheric pressure is lower than the spaces into which it opens.
WHO PERFORMS THE PROCEDURE AND WHERE IS IT PERFORMED?
An infectious disease or emergency physician usually admits patients to negative pressure rooms in hospitals or other healthcare facilities.
The purpose of a negative pressure room is to confine pathogens to sa single closed environment and to prevent the release of pathogens into other adjacent spaces.
Official counts of negative pressure rooms do not exist. Experts estimate that approximately 4000-5000 negative pressure rooms exist in hospitals throughout the United States.
A negative pressure room is designed to confine pathogens to a small volume of space. It is also intended to prevent the accidental release of pathogens into a greater space thereby protecting workers and employees in a hospital or other healthcare facility.
All communications between a negative pressure room and adjacent spaces are controlled. Communications include doors and ventilations ducts. These are sealed. Air flow is controlled by airlocks for human travel and vacuum pumps for ventilation systems.
Negative pressure rooms require special construction. All points if entrance or egress must be able to be tightly sealed so that air cannot pass by the seals. The room ventilation system must be equipped with a vacuum pump that must create a constant but relatively low level vacuum. This creates the negative pressure.
In operation, the vacuum created stops the outflow of air, thus containing
Two doors, separated by at least 6 feet, must be installed to create an airlock. Only one door is opened at a time. This preserves the vacuum, maintains the negative pressure and prevents pathogens from escaping.
QUESTIONS TO ASK YOUR DOCTOR
- Why am I being confined in a negative pressure room?
- What treatment options do I have?
All air exhausted from the room is routed through special filters that are designed to trap and contain pathogens.
Negative pressure rooms are used when the presence of an airborne pathogen such as tuberculosis is suspected.
Entrance and egress protocols must be followed by all people that enter or leave a negative pressure room.
Seals on vents and airlocks must be checked on a regular basis.
Negative pressure rooms must be decontaminated before being cleaned after being occupied.
Seal, pump or protocol failure destroys the negative pressure and increases the chances that pathogens will be released.
Inadequate cleaning after occupancy puts subsequent occupants at risk of exposure to a potentially dangerous pathogen.
In a properly operating negative pressure room, the expected and normal result is containment of a potentially dangerous pathogen.
Data on morbidity and mortality related to negative pressure rooms is not available.
The only feasible alternative to a negative pressure room is quarantine and isolation. This practice is very difficult to enforce. Even when enforced, it is not as microbiologically efficient.
Anthrax— A dangerous pathogen that should contained in a negative pressure room.
Ebola virus— A dangerous pathogen that should contained in a negative pressure room.
Tuberculosis— A dangerous pathogen that should contained in a negative pressure room.
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L. Fleming Fallon, Jr, MD, DrPH