- Meeting abstract
Inspiratory gas temperature in the endotracheal tube when ventilated with a heated humidifier
Critical Care volume 7, Article number: P158 (2003)
International Organization of Standardization recommends that inspiratory gas should possess absolute humidity of more than 33 mg/l. In this study we measured the temperature in the endotracheal tube (ETT) with a hypothesis that actual temperature of inspiratory gas is lower than that set by heated humidifier resulting in an inadequate humidification.
A lung model (TTL, Michigan Instruments) was ventilated using a PB840 ventilator (Puritan-Bennett) via an 8 mm ETT. A heated humidifier (MR290, Fisher & Paykel) was set in the inspiratory limb of a standard ventilator circuit with a target temperature of 37°C. The ventilator settings were: volume control mode, rate 10/min, PEEP 0 cmH2O with various tidal volumes (VT). The temperature of inspiratory gas was measured at 22 cm, 27 cm and 32 cm from the distal end of the ETT using a thin wire thermocouple thermometer.
Mean inspiratory temperatures (°C) are shown in Table 1.
The actual mean inspiratory gas temperature was lower than the target temperature set by the humidifier, especially with low VT, which may result in an inadequate humidification.
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Fujino, Y., Uchiyama, A., Miyoshi, E. et al. Inspiratory gas temperature in the endotracheal tube when ventilated with a heated humidifier. Crit Care 7, P158 (2003). https://doi.org/10.1186/cc2047
- Endotracheal Tube
- Target Temperature
- Ventilator Setting
- Thin Wire
- Absolute Humidity