EvitaXL

Measurements
Tube compensation ATC
Pressure support is calculated on the basis of a square function
of tube resistance and patient flow:
∆PAW = Comp.* KTube * Flow2 ∆PAW: Pressure support on the tube
Comp.: Degree of compensation 0 to 100 %
KTube: Tube coefficient (see table)
Flow: Patient flow
The tube coefficient KTube is largely determined on the basis
of the results obtained by Guttmann et al. Guttmann, Wolf et
al, see literature reference [19] on page 235.
The tube coefficient KTube for the full-length tube is always
taken as the basis. The effect of the shortened length is
negligible.
Tube type Inside diameter of
tube (mm)
Endotracheal
tube
Tube coefficient
KTube (mbar/L 2 /s 2 )
2.50..............................480.00
3.00..............................250.00
3.50..............................140.00
4.00.............................. 80.00
4.50.............................. 50.00
5.00.............................. 34.40
5.50.............................. 23.70
6.00.............................. 17.21
6.50.............................. 13.05
7.00.............................. 10.56
7.50.............................. 8.41
8.00.............................. 6.57
8.50.............................. 5.17
9.00.............................. 4.29
9.50.............................. 3.80
10.00.............................. 3.50
10.50.............................. 3.00
11.00.............................. 2.50
11.50.............................. 2.00
12.00.............................. 1.50
222 Instructions for Use EvitaXL