Description
156 Instructions for use Oxylog 3000 plus SW 1.n
PS
Pressure Support
Pressure Support for insufficient spontaneous
breathing.
PS can be used in combination with VC-SIMV,
PC-BIPAP and Spn-CPAP. With PS the device
supports the inspiration. The patient has control of
the spontaneous respiratory rate. During PS
strokes, the spontaneously breathing patient is
supplied with breathing gas, even if the inspiratory
effort is weak.
The Pressure Support is started when the
spontaneous inspiration flow reaches the set flow
trigger level. The device then increases the airway
pressure up to the preselected pressure
Δ
Psupp
above PEEP, which can be adjusted to the
condition of the patient.
The are three settings for the rate of pressure
increase (slope):
– Steep slope: The pressure rises rapidly,
meaning Oxylog 3000 plus supports
spontaneous breathing with a high initial flow.
– Flat slope: The pressure rises slowly, meaning
Oxylog 3000 plus supports spontaneous
breathing with a low initial flow. In this case
greater inspiratory effort by the patient may be
required.
– Medium slope: It is also possible to choose a
setting between a high and low initial flow.
The slope, the
Δ
Psupp above PEEP and the
patient's own breathing activity determine the
inspiratory flow.
PS is terminated:
– when the inspiratory flow falls below the
inspiration termination criterion set as a
percentage of the peak inspiratory flow after
100 ms (Insp.term.%PIF) (and thus
Δ
Psupp
above PEEP is reached), or
– after 4 seconds if the previous criterion has not
been fulfilled.
043
Phase
I II
Paw
Insp.
Flow
t
t
CPAP
Start of inspiration
max. 4 s
End of inspiration
Inspiration
termination %PIF
PPS
D
PS
over PEEP
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