Influence of flow rate, fluid temperature, and extension line on Hotline and S-line heating capability: an in vitro study

Hosu Kim, Tae Kyong Kim, Sukha Yoo, Jin Tae Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Background: A fluid warmer can prevent hypothermia during the perioperative period. This study evaluated the heating capabilities of Hotline and Barkey S-line under different flow rates and initial fluid temperatures, as well as after the extension line installation. Methods: We measured the temperature of a 0.9% sodium chloride solution at the fluid warmer outlet (TProx) and the extension line end (TDistal) with three different initial fluid temperatures (room, warm, and cold) and two flow rates (250 ml/hr and 100 mL/hr). Results: At a 250 ml/hr flow rate, the TProx and TDistal values were observed to be higher in Hotline than in S-line when using room-temperature or cold fluid. Administering of the warm fluid at the same flow rate significantly increased the TProx and TDistal values in S-line more than the cold and room-temperature fluids. At flow rates of 100 ml/hr, TDistal values were significantly lower than TProx values in both devices regardless of the initial fluid temperature. Conclusions: Hotline outperformed S-line for warming fluids at a high flow rate with cold or room-temperature fluids. Administering warm fluid in S-line prevented a decrease in the fluid temperature at a high flow rate. However, at a low flow rate, the fluid temperature significantly decreased in both devices after passing through an extension line.

Original languageEnglish
Article number1
JournalBMC Anesthesiology
Volume21
Issue number1
DOIs
StatePublished - Dec 2021

Keywords

  • Barkey S-line
  • Extension line
  • Flow rate
  • Fluid temperature
  • Heating capability
  • Hypothermia

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