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U.S. Range PS-4-20 Especificaciones Pagina 30

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Patient
Flow
APNEA APNEA APNEAAPNEA
A decrease in ventilation
is rapidly treated by
increasing Pressure Support
The minimal Pressure Support during normal
breathing or hyperventilation prevents
over ventilation and hypocapnia
Pressure Support decreases when normal
breathing (or hyperventilation) resumes
VPAP Adapt rapidly stabilizes breathing by increasing
Pressure Support in response to hypoventilation
VPAP Adapt turned ON VPAP Adapt turned OFF
HYPOPNEA
VPAP Adapt
Pressure
Treating periodic breathing
The Most Responsive Algorithm
ResMed’s ASV targets minute ventilation for optimal therapy outcomes
ResMed’s unique ASV algorithm continuously monitors and
learns the patient’s recent minute ventilation (tidal volume
× breathing rate) and sets a target at 90% of this calculation.
The Pressure Support then continuously adjusts to reflect
the patient’s changing needs, reliably and steadily keeping
patients on target all through the night. In ASVAuto
mode, the EPAP also responds to flow limitation,
snore and obstructive apneas on the next breath,
in proportion to the severity of the event.
Flow
Pressure
Max EPAP
Normal effort Flow
limitation
Obstructive
apnea
Increase in EPAP in response
to obstructive apnea
Pressure Support increases as minute
ventilation drops below the dynamic
target during the obstructive apnea
Min EPAP
Min Pressure Support
Increase in EPAP in
response to flow limitation
Pressure Support increases as minute
ventilation drops below the dynamic
target during flow limitation
ASVAuto mode
EPAP response based on AutoSet
™
algorithm
•In ASVAuto mode, the auto-adjusting Pressure Support functionality
works hand-in-hand with auto-adjusting EPAP, continuously monitoring
minute ventilation and respiratory flow to protect breathing.
•The algorithm predicts the onset of airway collapse, assessing the
flow shape of each breath. The technology responds to flow limitation
and snore, automatically adjusting EPAP in proportion to the severity
of the event, to maintain an open upper airway.
•If ventilation decreases away from target, the algorithm increases
Pressure Support and monitors how that affects minute ventilation.
•If there is little or no flow during this period, the advanced technology
can deduce that the airway is obstructed. Once breathing resumes, it
then increases EPAP to prevent further apneas from occurring.
•Once breathing is stabilized, the EPAP gradually decreases towards
the minimum EPAP setting for comfort, over a 20– 40 minute period,
depending on the type of event that occurred.
28 S9 VPAP Tx Lab System | Sleep Lab Titration Guide
ResMed.com
ASV Technology
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