Comparison of the temperature and humidity in the anesthetic breathing circuit among different anesthetic workstations: Updated guidelines for reporting parallel group randomized trials

Yoon Ji Choi, Sam Hong Min, Jeong Jun Park, Jang-Eun Cho, Seung-Zhoo Yoon, Suk Min Yoon, Somchai Amornyotin

Research output: Contribution to journalArticle

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Abstract

Background: For patients undergoing general anesthesia, adequate warming and humidification of the inspired gases is very important. The aim of this study was to evaluate the differences in the heat and moisture content of the inspired gases with low-flow anesthesia using 4 different anesthesia machines. Methods: The patients were divided into 11 groups according to the anesthesia machine used (Ohmeda, Excel; Avance; Dräger, Cato; and Primus) and the fresh gas flow (FGF) rate (0.5, 1, and 4L/min). The temperature and absolute humidity of the inspired gas in the inspiratory limbs were measured at 5, 10, 15, 30, 45, 60, 75, 90, 105, and 120minutes in 9 patients scheduled for total thyroidectomy or cervical spine operation in each group. Results: The anesthesia machines of Excel, Avance, Cato, and Primus did not show statistically significant changes in the inspired gas temperatures over time within each group with various FGFs. They, however, showed statistically significant changes in the absolute humidity of the inspired gas over time within each group with low FGF anesthesia (P<.05). The anesthesia machines of Cato and Primus showed statistically significant changes in the absolute humidity of the inspired gas over time within each group with an FGF of 4L/min (P<.05). However, even with low-flow anesthesia, the temperatures and absolute humidities of the inspired gas for all anesthesia machines were lower than the recommended values. Conclusion: There were statistical differences in the provision of humidity among different anesthesia workstations. The Cato and Primus workstations were superior to Excel and Avance. However, even these were unsatisfactory in humans. Therefore, additional devices that provide inspired gases with adequate heat and humidity are needed for those undergoing general anesthetic procedures.

Original languageEnglish
Article numbere7239
JournalMedicine (United States)
Volume96
Issue number25
DOIs
Publication statusPublished - 2017 Jun 1

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Humidity
Anesthetics
Respiration
Gases
Guidelines
Anesthesia
Temperature
Hot Temperature
General Anesthetics
Thyroidectomy
General Anesthesia
Spine
Extremities
Equipment and Supplies

Keywords

  • Absolute humidity
  • Anesthesia machine
  • Humidification
  • Temperature

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Comparison of the temperature and humidity in the anesthetic breathing circuit among different anesthetic workstations : Updated guidelines for reporting parallel group randomized trials. / Choi, Yoon Ji; Min, Sam Hong; Park, Jeong Jun; Cho, Jang-Eun; Yoon, Seung-Zhoo; Yoon, Suk Min; Amornyotin, Somchai.

In: Medicine (United States), Vol. 96, No. 25, e7239, 01.06.2017.

Research output: Contribution to journalArticle

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AB - Background: For patients undergoing general anesthesia, adequate warming and humidification of the inspired gases is very important. The aim of this study was to evaluate the differences in the heat and moisture content of the inspired gases with low-flow anesthesia using 4 different anesthesia machines. Methods: The patients were divided into 11 groups according to the anesthesia machine used (Ohmeda, Excel; Avance; Dräger, Cato; and Primus) and the fresh gas flow (FGF) rate (0.5, 1, and 4L/min). The temperature and absolute humidity of the inspired gas in the inspiratory limbs were measured at 5, 10, 15, 30, 45, 60, 75, 90, 105, and 120minutes in 9 patients scheduled for total thyroidectomy or cervical spine operation in each group. Results: The anesthesia machines of Excel, Avance, Cato, and Primus did not show statistically significant changes in the inspired gas temperatures over time within each group with various FGFs. They, however, showed statistically significant changes in the absolute humidity of the inspired gas over time within each group with low FGF anesthesia (P<.05). The anesthesia machines of Cato and Primus showed statistically significant changes in the absolute humidity of the inspired gas over time within each group with an FGF of 4L/min (P<.05). However, even with low-flow anesthesia, the temperatures and absolute humidities of the inspired gas for all anesthesia machines were lower than the recommended values. Conclusion: There were statistical differences in the provision of humidity among different anesthesia workstations. The Cato and Primus workstations were superior to Excel and Avance. However, even these were unsatisfactory in humans. Therefore, additional devices that provide inspired gases with adequate heat and humidity are needed for those undergoing general anesthetic procedures.

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