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•ETS. The recommended setting is 25% (40% for a COPD
patient); or you can you can leave this unchanged, when
required.
•TRC. It is recommended that TRC be enabled, with Com-
pensate set to 100%.
•Other settings. Set PEEP/CPAP and Oxygen values
according to clinical requirements. You can leave the
P-ramp setting at its standard value unless clinical
judgment calls for adjustment. To set it, see Table 5-2.
5.
Confirm
the settings.
6. Connect the patient to the ventilator if applicable. This will
initiate three test breaths.
Step 3: Compensation for changes in apparatus dead
space
NOTE:
Changes in alveolar dead space due to ventilation/perfu-
sion mismatch must be compensated via the %MinVol
control.
The device calculates the (anatomical or “series”) dead space
based on the IBW calculated from the patient height input.
Dead space is calculated as 2.2 ml per kg (1 ml per lb). This
dead space is a nominal value that is valid, on average, for intu-
bated patients whose endotracheal tube is connected to the
Y-piece of the ventilator by a standard catheter mount. If this
dead space is altered by an artificial airway configuration such
as a the use of a heat and moisture exchange filter (HME), or
nonstandard tubing, modify the Patient height setting accord-
ingly to take into account the added or removed dead space.
Consider this information when compensating dead space:
• A shorter-than-standard endotracheal or tracheostomy
tube probably does not require compensation.
• Different sizes of endotracheal tube probably do not require
compensation.
• A much longer-than-normal catheter mount can require
compensation.
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