Asb - Dräger Savina Instructions For Use Manual

ASB

Assisted Spontaneous Breathing
Pressure support for insufficient spontaneous breathing.
The function of the machine in assisting insufficient
spontaneous breathing is similar to that of the anaesthetist
who manually assists and monitors the patient's spontaneous
breathing by feeling the breathing bag.
The machine takes over part of the inhalation function, with
the patient maintaining control of spontaneous breathing.
The CPAP system supplies the spontaneously breathing
patient with breathing gas, even if the inspiration effort is
weak.
The pressure support of the ASB system is started:
— when the spontaneous inspiration flow reaches the set
value of the Flowtrigger,
or at the latest
— when the spontaneous inspired volume exceeds 25 mL.
The machine then produces an increase in pressure up to
the preselected ASB pressure ∆ P
is adjustable to the breathing requirement of the patient.
The flow supply can be adjusted using »FlowAcc« to meet the
individual needs of the patient.
— In case of high flow acceleration
Savina supports the insufficient spontaneous breathing
of the patient with a high peak flow.
— In case of low flow acceleration
Savina begins smoothly with even inspiratory flow.
ASB is terminated:
— when the inspiration flow returns to zero during phase I,
i.e. when the patient exhales or fights the ventilator,
or
— when the inspiration flow in phase II falls below 25 % of
the last inspiration flow supplied (∆ P
thus reached)
or
— at the latest after 4 seconds if the two other criteria have
not come into operation.
If this time criterion occurs, the advisory message
"! ASB > 4 s" is displayed.
If this time criterion occurs three times in succession,
Savina displays a warning message "!!! ASB > 4 s" and
warns of a possible leak in the ventilation system.
In »Mask/NIV« mode the »Tinsp« key is used to set the
maximum duration of the ABS stroke.
above PEEP, which
ASB
above PEEP is
ASB
Paw
Phase
I II
∆ P
ASB
above PEEP
FlowAcc
CPAP
Start of inspiration
Insp.
Flow
max. 4 s
Description
t
End of inspiration
25% insp. flow
t
103