Principles of operation
158
Instructions for use Babylog 8000 plus SW 5.n
Synchronized Intermittent Positive
Pressure Ventilation (
SIPPV
)
Mechanical breaths are synchronized with
spontaneous breathing. A mechanical breath
begins with a spontaneous inspiration and ends
after the inspiratory time
T
I
has elapsed.
The shape of the mechanical breath is set in the
same way as in the
IPPV/IMV
ventilation mode.
The device detects spontaneous breathing via flow
measurement.
The following conditions must be met in order for a
mechanical breath to be triggered:
– The inspiratory flow must be measured
following an expiration.
– The volume Vtrig (A) inhaled in the course of
the spontaneous inspiration must correspond
to a volume of at least the selected trigger
sensitivity.
– The inhaled volume Vtrig (A) must be inhaled
until the end of
T
E
.
In addition, a mechanical breath may not begin
until at least 0.2 s after the end of the previous
breath so that there is enough time to exhale.
The patient controls the respiratory rate. It can rise
to a maximum of:
fmax = 1 / (
T
I
+ 0.2 s + RT)
RT: Trigger Response Time.
Time from the beginning of a spontaneous
inspiration until the triggered mechanical breath
starts
When the patient no longer triggers mechanical
breaths, ventilation begins as in the
IPPV/IMV
ventilation mode.
The
SIPPV
ventilation mode is appropriate for
patients with sufficient spontaneous breathing and
breath regulation. The patient can be weaned by
gradually reducing the inspiratory pressure.
21
171
Paw
PEEP
TI
t
t
Flow
A
A