Dual Prescription Feature; Triggering - PHILIPS Respironics Trilogy 202 User Manual

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Dual Prescription Feature

The device provides a dual prescription feature that allows you
to enter a primary prescription and a secondary prescription for
the patient if needed. For example, you can set a primary daytime
prescription and secondary nighttime prescription. See Chapter 5 for
more information on the dual prescription feature.

Triggering

The device can be set to trigger breaths using the Auto-Trak or Flow
Trigger sensitivity features.
Digital Auto-Trak Sensitivity
An important characteristic of the device is its ability to recognize
and compensate for unintentional leaks in the system and to
automatically adjust its trigger and cycle algorithms to maintain
optimum performance in the presence of leaks. This feature is known
as Digital Auto-Trak Sensitivity. The following sections examine this
function in detail by describing the leak tolerance function and
sensitivity.
Leak Tolerance
A microprocessor monitors the total flow of the patient circuit and
calculates patient flow values.
A. Leak Estimation: Average and Parabolic
The device uses two leak estimation algorithms. A conservation
of mass algorithm is used to compute the average leak for a given
pressure support relationship. This average leak is used when large
leak variations are present in the system. Average leak is a high
estimate during EPAP pressure and a low estimate during IPAP
pressure. A better leak estimate, enabled by the digital system, is the
parabolic leak algorithm. Parabolic leak is proportional to the square
of the patient pressure; therefore, the leak estimate is correlated to
the changing patient pressure. Both algorithms include unintentional
circuit leak and are averaged over several breaths.
Trilogy 202 user manual
Note: Both prescriptions must
use the same circuit type.
Note: Auto-Trak is only
available if you are using a
passive circuit.