The effects of preserving humidity and temperature by low flow anesthesia are different in each other anesthesia workstation.
The fresh gas flow(FGF) is dry and cold in old fashioned anesthesia machine, especially at high folw (above 1 L/min). To the contrary, it has been assumed that the heat and humidity of FGF may be preserved using low FGF (below 1 L/min) during anesthesia or new anesthesia work station. However, it has not been proved yet. We hypothesized that the heat and moisture of FGF may be different in various FGF rate during anesthesia. In addition, it may be different in accordance to anesthesia work station. Therefore, we planed prospective observational study that will demonstrate that the difference of heat and moisture of FGF in different anesthesia work station (Excel; 1st generation anesthesia machine of Datex-Ohmeda Corp., Avance; 2nd generation anesthesia work station of Datex-Ohmeda Corp., Cato; 2nd generation generation anesthesia work station of Drager, Primus; 3rd generation generation anesthesia work station of Drager) and different FGF (0.5, 1, 4 L/min)
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
HEALTH_SERVICES_RESEARCH
Masking
NONE
Enrollment
60
maintain one of following fresh gas flow, 1 or 4 L/min (nitrous oxide:oxygen =1:1) during 2 hour with using Datex Ohmeda excel anesthesia machine after draping complete
maintain one of following fresh gas flow, 0.5 or 1 or 4 L/min (nitrous oxide:oxygen =1:1) during 2 hour with using Datex Ohmeda Avance anesthesia machine after draping complete
maintain one of following fresh gas flow, 0.5 or 1 or 4 L/min (nitrous oxide:oxygen =1:1) during 2 hour with using Drager Cato anesthesia work-station after draping complete
Korea University Anam Hospital
Seoul, South Korea
RECRUITINGabsolute humidity at both limb of breathing circuit just distal portion of Y-piece
time point 1; base line value (fresh gas flow(FGF); 8L/min) time point 2; 5 mintues(min) after FGF change to predetermined level time point 3; 10 min after FGF change to predetermined level time point 4; 15 min after FGF change to predetermined level time point 5; 30 min after FGF change to predetermined level time point 6; 45 min after FGF change to predetermined level time point 7; 60 min time point 8; 75 min time point 9; 90 min time point 10; 105 min time point 11; 120 min
Time frame: time point 1-11
patient body temperature(BT)
measure BT using esophageal temperature probe each time points are same as primary outcome
Time frame: time point 1 -11
temperature at both limb of breathing circuit just distal portion of Y-piece
the time points are same as primary outcome
Time frame: time point 1- 11
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maintain one of following fresh gas flow, 0.5 or 1 or 4 L/min (nitrous oxide:oxygen =1:1) during 2 hour with using Drager Primus anesthesia work-station after draping complete