Exposure to coughed airborne pathogens in a double bed hospital patient room with overhead mixing ventilation: impact of posture of coughing patient and location of doctor

W. Kierat, Zhecho Dimitrov Bolashikov, Arsen Krikor Melikov, Z. Popiołek, Marek Brand

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Abstract

The exposure of a doctor and a patient to air coughed by a second infected patient was studied in a mock-up of two-bed hospital infectious ward with mixing ventilation at 22oC (71.6 F) room air temperature. The effect of posture of the coughing patient lying sideways or on back), position of the doctor (either facing the coughing patient or standing sideways) at three ventilation rates (3 h-1, 6 h-1 and 12 h-1) was examined. Thermal manikin with realistic body shape and surface temperature distribution was used to resemble the doctor. The coughing patient was simulated by a heated dummy with a cough generator. Another heated dummy was used to simulate the second patient in the second bed. The cough consisted of 100% CO2. The Peak Cough Time was 4 s, when the doctor was close to coughing patient and increased more than twice for the exposed patient. The level of exposure (Peak Concentration Level) depends on the positioning relative to the cough direction: lying or standing still, facing or turned sideways and changed varied 194 to 10228 ppm. Ventilation rates of 12 h-1 (recommended by present hospital standards) resulted in increased background exposure levels and may suggest risk from airborne cross-infection.
Original languageEnglish
Title of host publicationProceedings of ASHRAE IAQ 2010
Number of pages16
Publication date2010
Article numberTOPC-00128-2010
Publication statusPublished - 2010
EventASHRAE IAQ 2010: Airborne Infection Control - Ventilation, IAQ, & Energy - Kuala Lumpur, Malaysia
Duration: 10 Nov 201012 Nov 2010

Conference

ConferenceASHRAE IAQ 2010
Country/TerritoryMalaysia
CityKuala Lumpur
Period10/11/201012/11/2010

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