A significantly low inspiration gas temperature was noted in
				patients in group B, initially (27.2 ± 2.5°C) and after 2 days
				(28.0 ± 1.6°C) (P 
 without an additional humidification system (group B)
electronic jet-ventilator either with (group A)  group C received high-frequency percussive ventilation (HFPV) by a pneumatic high-frequency respirator, using a hot water humidifier for warming and moistening the inspiration gas. Group D received conventional mechanical ventilation using a standard intensive care unit respirator with a standard humidification system.
temperature measured inside the tube after 2 days