Pressure Support Ventilation (Optional) - Dräger Apollo Operating Instructions Manual

Pressure Support Ventilation (Optional)

Pressure Support Ventilation
(Optional)
The Apollo has an optional pressure-assisted
ventilation mode. It is intended to reduce the work of
breathing and is indicated for use only in patients
who are breathing spontaneously. Patients who are
not making spontaneous breathing efforts are not
candidates for pressure support ventilation.
Pressure support ventilation is triggered by the
patient's spontaneous effort to breathe. Most
anesthetic agents will cause patients to have
reduced ventilatory responses to carbon dioxide and
to hypoxemia. Therefore, patient triggered modes of
ventilation may not produce adequate ventilation.
Additionally, the use of neuromuscular blocking
agents will interfere with patient triggering.
Synchronization and pressure support for the
spontaneous breathing efforts are controlled via the
sensitivity of the flow trigger and the level of ∆P
The rate at which the pressure curve rises is preset
via the rise time T
SLOPE
The maximum inspiratory time for a spontaneous
breathing stroke varies with age. It is equal to not
more than 1.5 seconds in patients under the age of 4,
and not more than 4 seconds in patients with a set
age of 4 years or more.
Inspiration is ended as soon as the actual inspiration
flow drops below 25% of the inspiratory peak flow.
Any leakage is compensated at the actual airway
pressure at the same time.
Apnea ventilation can be additionally set via the
minimum frequency (Freq
automatically triggered via Freq
spontaneous breathing activity by the patient. This is
not a mandatory ventilation stroke by the ventilator;
the patient can end the stroke triggered by the
ventilator at any time by breathing spontaneously.
This stroke is not identified by a trigger indicator.
Apnea ventilation can also be deactivated again by
"OFF".
setting the Freq
MIN to
Apnea ventilation is intended to provide some degree
of gas exchange if the patient's respiratory rate falls
below the desired minimum setting. It is not intended
as a primary mode of ventilation.
Apollo Operator's Manual
PS
. Refer to Figure 71.
). The ventilator is
MIN
if there is no
MIN
Figure 71. Respiratory Cycle - Pressure Support Mode
Trigger indicator
Pressure
P
T
SLOPE
1/Freq.
Flow
25%
Flow trigger
.
Chapter 7 - Ventilation
Trigger indicator
PS
MIN
1/Freq.
MIN
25%
Flow trigger No trigger
Apnea
ventilation
Time [s]
Time [s]
97