About Stellar 150 Therapy Modes; Common Setting Parameters - ResMed Stellar 150 Clinical Manual

About Stellar 150 therapy modes

Stellar provides a number of therapy modes to suit a variety of ventilation requirements.
Regardless of the mode, Stellar 150 assists spontaneous breathing by providing two pressures
in response to the patient flow or a preset fixed time.

Common setting parameters

The inspiratory positive airway pressure (IPAP, or the sum of PEEP and Pressure Support/PS)
assists inspiration. The lower expiratory positive airway pressure (EPAP or PEEP) eliminates
exhaled air through the exhaust vent. This pressure also provides a stent to maintain an open
upper airway, improves small airway recruitment and therefore oxygenation and may improve
triggering in some patients with intrinsic PEEP.
The difference of the two pressures—Pressure Support/PS—contributes to improved patient
ventilation.
Pressure
IPAP
Pressure
Support
EPAP /
PEEP
0
Stellar provides the following modes:
CPAP mode—a fixed pressure is delivered.
•
S (Spontaneous) mode—the device senses the patient breath and triggers IPAP in
•
response to an increase in flow, and cycles into EPAP at the end of inspiration. The breath
rate and the respiratory pattern will be determined by the patient.
ST (Spontaneous/Timed) or PS (Pressure Support) mode—the device augments any
•
breath initiated by the patient, but will also supply additional breaths should the patient
breath rate fall below the clinician's set 'backup' breath rate.
T (Timed) mode—the fixed breath rate and the fixed inspiration time set by the clinician are
•
supplied regardless of patient effort.
PAC (Pressure Assist Control)—the inspiration time is preset in the PAC mode. There is no
•
spontaneous/flow cycling. The inspiration can be triggered by the patient when respiratory
rate is above a preset value, or time triggered breaths will be delivered at the backup breath
rate.
iVAPS (intelligent Volume Assured Pressure Support)—designed to maintain a preset
•
target alveolar ventilation by monitoring delivered ventilation, adjusting the pressure support
and providing an intelligent backup breath automatically. The iVAPS therapy mode is
indicated for patients 66 lb (30 kg) and above.
2
One Breath Cycle
Ti Max
Ti Min
Rise time Fall time