Temperature and Humidity During Different Neonatal Respiratory Support Modes: An In-Vitro Performance of Four Heated...

Area of Science:

• Neonatal respiratory care
• Medical device engineering
• Thermoregulation and humidification

Background:

• Optimal heating and humidification of inspired gas are critical for preterm infants on respiratory support.
• Variability in performance among neonatal heated humidifiers can impact patient outcomes.

Purpose of the Study:

• To compare temperature (T) and absolute humidity (AH) from different neonatal heated humidifiers.
• To evaluate performance across various respiratory support modes and settings.

Main Methods:

• Four neonatal heated humidifiers were tested using a neonatal test lung in an incubator.
• Measurements were taken at different gas flow rates and ventilation modes (conventional and high-frequency oscillatory).
• Thermohygrometer used to measure T and relative humidity, calculating AH proximal to the test lung.

Main Results:

• Significant variation in T and AH observed among humidifiers and settings.
• Bias flow was the primary determinant; higher flow increased T and AH.
• MR950 humidifier failed to meet adequate T (<36.7°C) and AH (<37 g/m³), especially at flows <5 L/min.
• Hydraltis 9500neo and MR850 generally achieved higher AH (>44 g/m³).

Conclusions:

• Heated humidifier performance, specifically T and AH, varies significantly with device and gas flow.
• Clinical studies are necessary to determine the impact of this variability on patient outcomes.