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Kinetics of isoflurane and sevoflurane in a unidirectional displacement flow and the relevance to anesthetic gas exposure by operating room personnel.
Herzog-Niescery, Jennifer; Bartz, Horst; Vogelsang, Heike; Bunse, Jörg; Maier-Hasselmann, Andreas; Bellgardt, Martin; Gude, Philipp; Weber, Thomas P; Seipp, Hans-Martin.
Afiliação
  • Herzog-Niescery J; a Katholisches Krankenhaus Bochum , St. Josef Hospital, Department of Anesthesiology , Ruhr-University Bochum , Germany.
  • Bartz H; b Department of Life Science Engineering , University of Applied Sciences , Giessen , Germany.
  • Vogelsang H; a Katholisches Krankenhaus Bochum , St. Josef Hospital, Department of Anesthesiology , Ruhr-University Bochum , Germany.
  • Bunse J; c Department of Surgery , Sana Hospital Lichtenberg , Berlin , Germany.
  • Maier-Hasselmann A; d Department of Vascular Surgery , Städtisches Klinikum Bogenhausen , Munich , Germany.
  • Bellgardt M; a Katholisches Krankenhaus Bochum , St. Josef Hospital, Department of Anesthesiology , Ruhr-University Bochum , Germany.
  • Gude P; a Katholisches Krankenhaus Bochum , St. Josef Hospital, Department of Anesthesiology , Ruhr-University Bochum , Germany.
  • Weber TP; a Katholisches Krankenhaus Bochum , St. Josef Hospital, Department of Anesthesiology , Ruhr-University Bochum , Germany.
  • Seipp HM; b Department of Life Science Engineering , University of Applied Sciences , Giessen , Germany.
J Occup Environ Hyg ; 16(4): 294-301, 2019 Apr.
Article em En | MEDLINE | ID: mdl-30852983
ABSTRACT
International guidelines recommend the use of ventilation systems in operating rooms to reduce the concentration of potentially hazardous substances such as anesthetic gases. The exhaust air grilles of these systems are typically located in the lower corners of the operating room and pick up two-thirds of the air volume, whereas the final third is taken from near the ceiling, which guarantees an optimal perfusion of the operating room with a sterile filtered air supply. However, this setup is also employed because anesthetic gases have a higher molecular weight than the components of air and should pool on the floor if movement is kept to a minimum and if a ventilation system with a unidirectional displacement flow is employed. However, this anticipated pooling of volatile anesthetics at the floor level has never been proven. Thus, we herein investigated the flow behaviors of isoflurane, sevoflurane, and carbon dioxide (for comparison) in a measuring chamber sized 2.46 × 1.85 × 5.40 m with a velocity of 0.3 m/sec and a degree of turbulence <20%. Gas concentrations were measured at 1,728 measuring positions throughout the measuring chamber, and the flow behaviors of isoflurane and sevoflurane were found to be similar, with an overlap of 90%. The largest spread of both gases was 55 cm at 5.4 m from the emission source. Interestingly, neither isoflurane nor sevoflurane was detected at floor level, but a continuous cone-like spreading was observed due to gravity. In contrast, carbon dioxide accumulated at floor level in the form of a gas cloud. Thus, floor level exhaust ventilation systems are likely unsuitable for the collection and removal of anesthetic gases from operating rooms.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Salas Cirúrgicas / Sevoflurano / Isoflurano Idioma: En Ano de publicação: 2019 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Salas Cirúrgicas / Sevoflurano / Isoflurano Idioma: En Ano de publicação: 2019 Tipo de documento: Article