72 Instructions for use | Atlan A300, A300 XL, A350, A350 XL SW 1.0n
Assembly and preparation
4.8.3 Observing resistance and compliance
Accessories such as filters influence the dead space, compliance, and resistance of
the breathing circuit.
In addition, changes in resistance and compliance arise over time as a result of
moisture in the breathing gas or residues of secretions.
4.8.3.1 Calculating the resistance of the breathing system and connected
accessories
The sum of the resistance values in the inspiratory limb must not be less than –
6.0 hPa (cmH
2O). The sum of the resistances in the expiratory limb must not
exceed 6.0 hPa (cmH
2O).
Only include resistance values in calculations that were taken under the same flow
conditions:
The following formula is used to calculate the resistance (R):
R
Inspiration =
R
Breathing system_insp - RInsp hose - RBreathing bag hose - RInsp filter (port) - RInsp filter
(Y-piece)
RExpiration =
R
Breathing system_exp + RExp hose + RExp filter (port) + RExp filter (Y-piece)
If necessary, take into consideration other parts such as water traps or additional
hoses. The specifications for the resistance of the breathing system can be found
on page 290. The specifications for all other accessories can be found in the
respective instructions for use.
In these instructions for use, the specifications for the resistance in the inspiratory
limb are regarded as negative values. The resistance values given in the
instructions for use for the accessories must therefore be subtracted from the
inspiratory resistance of the breathing system.
Patient category Flow
Adults 30 L/min
Pediatric patients 15 L/min
Neonates 2.5 L/min
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