Comparison of Heat and Humidity Conservation Among Different Anesthesia Workstation and Different Flow Rate.
Trial Snapshot
- Phase
- Phase 4
- Enrollment
- 60
- Locations
- 1
- Primary Endpoint
- absolute humidity at both limb of breathing circuit just distal portion of Y-piece
Study Overview
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)
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Single Group
- Primary Purpose
- Health Services Research
- Masking
- None
Eligibility Criteria
- Ages
- 18 Years to 70 Years (Adult, Older Adult)
- Sex
- All
- Accepts 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
Outcomes
Primary Outcomes
absolute humidity at both limb of breathing circuit just distal portion of Y-piece
Time Frame: 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 Outcomes
- patient body temperature(BT)(time point 1 -11)
- temperature at both limb of breathing circuit just distal portion of Y-piece(time point 1- 11)