| Effects of Six Heat and Miosture Exchange for Use during Endotracheal Anesthesia . |
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Suk Min Yoon |
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Department of Anesthesiology, College of Medicine, Korea University, Seoul, Korea. |
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| Abstract |
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Despite many theoretical advantages of humidification of anesthetic gas, the role and method of choice of humidification in anesthesia remains uncertain. With the recent introduction of disposable heat and moisture exchangers (HME), a paueity of information of the specific performance characteristics of various HMEs exists. Using an on-line humidity detector, based on the dry-wet bulb principle, with a fast response temperature sensor (0.l sec), I have reexamined the effectiveness in maintaining humidity and temperature of various commercially available HMEs in clinical settings, and the relationship of the effectiveness of the rate of fresh gas flow. Humid-Vent 2 demonstrated the best result that increased the inspired temperature from 22.78+/-0.2degrees C to 31.35+/-0.89degrees C (absolute humidity; 27.4+/-0.7mg H2O/L). Extreme low fresh gas flow(500ml/min) demonstrated low absolute humidity (18.87+/-1.28 mg H2O/L) that was lower than use of HME. |
| Key Words:
Heat and Moisture Exchangers; Relative Humidity; Absolute Humidity; Inspired Temperature; Fresh Gas Flow; Humidifiers |
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