Humidity, Temperature
Conditions
Keywords
Humidity, Temperature, Low Flow Anesthesia
Brief summary
The effects of preserving humidity and temperature by low flow anesthesia are different in each other anesthesia workstation.
Detailed description
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)
Interventions
DEVICEDatex Ohmeda excel anesthesia machine
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
DEVICEDatex Ohmeda Avance anesthesia work-station
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
DEVICEDrager Cato anesthesia work-station
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
DEVICEDrager Primus anesthesia work-station
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
Sponsors
Korea University Anam Hospital
Study design
Allocation
RANDOMIZED
Intervention model
SINGLE_GROUP
Primary purpose
HEALTH_SERVICES_RESEARCH
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 70 Years
Healthy volunteers
No
Inclusion criteria
* patients who planned more than 2 hour operation under general anesthesia * ASA class 1,2 * blood loss less than 500ml
Exclusion criteria
* acute/chronic cardiac or respiratory disease
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| absolute humidity at both limb of breathing circuit just distal portion of Y-piece | time point 1-11 | 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 |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| patient body temperature(BT) | time point 1 -11 | measure BT using esophageal temperature probe each time points are same as primary outcome |
| temperature at both limb of breathing circuit just distal portion of Y-piece | time point 1- 11 | the time points are same as primary outcome |
Countries
South Korea
Contacts
Primary ContactSeung Zhoo Yoon, Assist. P.
Backup ContactSam Hong Min, Clin. I.
Outcome results
None listed