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Document ID (ISN)104950
CIS number 06-387
ISSN - Serial title 1545-9624 - Journal of Occupational and Environmental Hygiene
Year 2005
Convention or series no.
Author(s) Chessor E., Verhoeven M., Hon C.Y., Teschke K.
Title Evaluation of a modified scavenging system to reduce occupational exposure to nitrous oxide in labor and delivery rooms
Bibliographic information June 2005, Vol.2, No.6, p.314-322. Illus. 22 ref.
Internet access 06-0387.pdf [in English]
Abstract A new scavenging mask was developed for the administration of nitrous oxide to mothers-to-be during labour in order to minimize leakage of the patient's exhaled breath into the room and staff exposure. The scavenging system was designed with an inner mask for gas delivery, an outer mask to capture exhaled breath and a continuous exhaust airflow based on breathing flow rates. It was tested by measuring exposures of 30 nurses and 33 room air concentrations, while patients self-administered nitrous oxide either through the conventional or modified scavenging system. The new scavenging system significantly reduced exposures in the room and to nurses (concentrations of 39.7ppm and 40.2ppm, respectively, compared with 82.2ppm and 69.3ppm, respectively, for the conventional system). Additional modifications to the scavenging system may further reduce nitrous oxide concentrations and improve comfort and usability.
Descriptors (primary) nitrous oxide; determination in air; hospitals; limitation of exposure
Descriptors (secondary) description of equipment; exposure evaluation; personal sampling
Document type D - Periodical articles
Country / State or ProvinceCanada; Netherlands
Subject(s) Toxic and dangerous substances
Broad subject area(s) Chemical safety
Browse category(ies) Health care services
Inorganic substances