Instructions for use Fabius plus SW 3.n
77
Assembly and preparation
Calculating the resistance of the breathing
system and connected accessories
To keep the patients' work of breathing as low as
possible, according to general safety standards a
total inspiratory and expiratory resistance of
6.0 hPa (cmH
2
O) at 60 L/min must not be
exceeded.
The chapter ''Technical data'' contains the
inspiratory and expiratory resistance values of the
breathing system without taking into consideration
the breathing hoses. In this manner it is possible to
determine the respective resistance of the patient
when using different breathing hose sets and/or
filters.
The following formula is used to calculate the
resistance (R):
R
Inspiration
= R
Breathing system_insp
+ R
Insp hose
+
R
Breathing bag hose
+ R
Insp filter(port)
+ R
Insp filter(Y-
piece)
R
Expiration
= R
Breathing system_exsp
+ R
Exsp hose
+
R
Exsp filter(port)
+ R
Exsp(Y-piece)
Make sure that for the calculation of the resistance
only the accessories resistance values and the
peak flows are used for the respective accessory
category and patient category, e.g., resistance
values for adults at 60 L/min, for children at
30 L/min, and for neonates at 5 L/min.