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OPERATION
The DeVilbiss AutoAdjust LT nasal CPAP system, model #8054, offers automatic adjust-
ment of the administered CPAP pressure. The device is equipped with a pneumota-
chometer which monitors the patient's air flow signal for purposes of identifying any
flow restrictions and snoring episodes often associated with respiratory events. The
DeVilbiss AutoAdjust LT nasal CPAP device has been designed to minimize these flow
restrictions which often lead to patient arousal and fragmented sleep by automatically
increasing the CPAP pressure in the presence of respiratory events. A proprietary pres-
sure adjustment control algorithm has been developed by Sunrise Medical which is
based around event density and event type.
The pressure profile changes are gradual so as to prevent arousals of sleep architec-
ture, but are timely to respond to respiratory events requiring pressure adjustments.
The device also reduces airway pressure in an attempt to minimize the average sup-
plied pressure administered throughout the night. Refer to Diagram 1 of a typical
pressure profile administered to a patient and associated operating states.
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O p e r a t i o n
O p e r a t i o n
UPPER PRESSURE LIMIT
LOWER PRESSURE LIMIT
A B C
D
E
F
TIME
A)
Power switch turned on.
A-B) AutoAdjust is in low pressure pause state, providing low level of flow and
CPAP pressure.
B)
Patient breathing is detected, pressure is increased to the lower pressure
limit prescription setting.
C-D) Patient falls asleep.
D-E) Patient begins to have respiratory events. Unit senses the events and adjusts
pressure.
E-F) Pressure returns to the lower limit as events become less frequent. (Note:
Pressure cannot be less than the lower pressure limit unless the A/D button
is pressed to reach the low pressure pause mode.)
F-G) Respiratory events resume and the CPAP pressure is automatically adjusted to
reduce the number of events.
G)
Patient presses the A/D button on the front of the unit, causing the pressure
to drop to low pressure pause level. The low pressure pause mode of opera-
tion provides a low level of flow and pressure (approximately 3 cm H2O). If
the patient wakes up with a high CPAP pressure, this allows the patient to
fall back asleep more comfortably.
G-H) Patient falls back asleep and begins to have respiratory events. The
AutoAdjust unit detects the events and automatically adjusts the CPAP pres-
sure level.
H)
CPAP pressure has been automatically increased and has reached the upper
pressure limit prescription setting for the product. (Note: CPAP pressure can-
not go over the upper limit regardless of patient events.)
I)
A large leak in the system, usually at the patient mask, has been detected
by the AutoAdjust CPAP and the unit has reduced the pressure to the low
pressure pause level.
J-K) Breathing signals have been sensed at the mask and normal operation of the
unit has resumed. When breathing is detected, the pressure is raised to 80%
of the pressure level that the unit was operating at when the leak was
sensed.
K)
The patient has awakened and has pressed the A/D button on the front of
the unit to reduce the pressure to the low pressure pause level.
L)
The patient switches the unit off.
DIAGRAM 1
80%
G
H
I
J
K
L
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