Planning And Designing An Isolation Facility In Hospitals
Infection control is emerging as a biggest challenge to health services around the world. All hospitals knowingly or unknowingly admit patients with communicable diseases. In recent years, emerging infectious diseases represent an ongoing threat to the health and livelihoods of people everywhere. Over the last few decades, there have been several emerging infectious diseases (EIDs) that have taken the global community by surprise and drawn new attention to EIDs, including HIV, SARS, H1N1, Ebola, Encephalitis (NIPAH Virus), and Now COVID-19 . For over a century, it has been recommended that patients with infectious diseases should be placed in segregated facilities to prevent the spread of infection. Hospital’s isolation precautions must fulfill following objective: Types of Isolation Rooms There are two types of isolation rooms: (1) airborne infection isolation (AII) rooms and (2) protective environ- ment (PE) rooms. isolation refers to the isolation of patients infected with organisms spread via airborne droplet nuclei <5 μm in diameter. These include patients suffering form measles, chickenpox and tuberculosis. Location The isolation rooms should be located at one end of medical and surgical wards/critical care units/pediatric care units/newborn intensive care units/emergency service areas/also other areas, such as dialysis. Isolation wards for infectious cases to be kept out of routine circulation. The location of the proposed isolation room, such as those near elevator or doorways should be avoided if possible. Number of beds for isolation beds About 2.5% of the beds of a large hospital in a special unit would probably be adequate except during periods of unusually high demand. Space An isolation room has to provide sufficient space around the bed for equipment and the increased number of personnel involved in emergency care. A room area of about 22 m2 is adequate within an isolation unit. Bed Management General Planning Considerations Ventilation HVAC air flow arrangement for class N rooms. An anteroom designed to provide an ‘air-lock’ (no mix of air) between the infectious patient and the common space is placed adjacent to the patient room. The air would flow from the anteroom to the isolation room. Recirculation of exhausted air is discouraged. The exhaust air should be directed to outside, away from air-intakes and populated areas. However, where recirculation may be deemed acceptable, HEPA filters (99.97% @ 0.3 μm DOP) capable of removing airborne contaminants on the supply side must be incorporated. The supply air should be located such that clean air is first passed over the staff/other occupants and then to the patient. In Class P rooms can be either 100% fresh air or can use re-circulated air usually a 60/40 mix of outdoor air/ re-circulated air. The supply air should be located such that clean air is first flows across the patient bed and exits from the opposite side of the room. Air distribution should reduce the patient’s exposure to potential airborne droplet nuclei from occupants. Positive pressure rooms may share common supply air systems Emergency Rooms and Reception Areas The likelihood of airborne contaminants leaving these rooms is reduced by keeping these rooms under negative pressure, relative to surrounding areas. Air is exhausted from these rooms either directly to the outside or through high efficiency particulate air (HEPA) filters. Anterooms If space and budget permit, an anteroom should be pro- vided between the negative/positive pressure isolation room and the corridor It is always recommended for both positive and negative isolation rooms for three main reasons: Fire Plan