The Humidity in a Low-Flow Dräger Fabius Anesthesia Workstation with or without Thermal Insulation or a Heat and Moisture Exchanger: A Prospective Randomized Clinical Trial

During anesthesia, as compared with intensive care, the time of the tracheal intubation is much shorter. An inhaled gas minimum humidity of 20 mgH2O.L-1 is recommended to reduce the deleterious effects of dry gas on the airways during anesthesia with tracheal intubation. The Fabius GS Premium® anest...

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Bibliographic Details
Published in:PloS one 2017-01, Vol.12 (1), p.e0170723-e0170723
Main Authors: de Oliveira, Sergius A R, Lucio, Lorena M C, Modolo, Norma S P, Hayashi, Yoko, Braz, Mariana G, de Carvalho, Lídia R, Braz, Leandro G, Braz, José Reinaldo C
Format: Article
Language:English
Subjects:
Absolute humidity
Adolescent
Adult
Ambient temperature
Anesthesia
Anesthesia, Inhalation - instrumentation
Anesthesiology
Anesthesiology - instrumentation
Anesthetics - administration & dosage
Biology and Life Sciences
Body mass index
Breathing
Carbon dioxide
Circuits
Clinical trials
Earth Sciences
Female
Flow
Gas flow
Gas temperature
Gases
Gases - administration & dosage
Germany
Heat
Humans
Humidity
Insulation
Intensive care
Intubation
Intubation, Intratracheal - instrumentation
Low flow
Lung - drug effects
Lung - physiology
Lungs
Male
Mean temperatures
Medical schools
Medicine and Health Sciences
Middle Aged
Moisture
Patients
Pediatrics
Physical Sciences
Randomization
Respiration
Respiration, Artificial - instrumentation
Surgery
Temperature
Temperature effects
Thermal insulation
Ventilators
Work stations
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Summary:During anesthesia, as compared with intensive care, the time of the tracheal intubation is much shorter. An inhaled gas minimum humidity of 20 mgH2O.L-1 is recommended to reduce the deleterious effects of dry gas on the airways during anesthesia with tracheal intubation. The Fabius GS Premium® anesthesia workstation (Dräger Medical, Lübeck, Germany) has a built-in hotplate to heat gases in the breathing circuit. A heat and moisture exchanger (HME) is used to further heat and humidify the inhaled gas. The humidity of the gases in the breathing circuit is influenced by the ambient temperature. We compared the humidity of the inhaled gases from a low-flow Fabius anesthesia workstation with or without thermal insulation (TI) of the breathing circuit and with or without an HME. We conducted a prospective randomized trial in 41 adult female patients who underwent elective abdominal surgery. The patients were allocated into four groups according to the devices used to ventilate their lungs using a Dräger Fabius anesthesia workstation with a low gas flow (1 L.min-1): control, with TI, with an HME or with TI and an HME (TIHME). The mean temperature and humidity of the inhaled gases were measured during 2-h after connecting the patients to the breathing circuit. The mean inhaled gas temperature and absolute humidity were higher in the HME (29.2±1.3°C; 28.1±2.3 mgH2O·L-1) and TIHME (30.1±1.2°C; 29.4±2.0 mgH2O·L-1) groups compared with the control (27.5±1.0°C; 25.0±1.8 mgH2O·L-1) and TI (27.2±1.1°C; 24.9±1.8 mgH2O·L-1) groups (P = 0.003 and P
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0170723