Philips Respironics V60, User Manual

Page: 50 / 212

4-6
Principles of operation
Tidal volume adjustment. Every breath, the ventilator compares the inspiratory
and expiratory tidal volumes. Any difference is assumed to be due to an
unintentional circuit leak. The ventilator adjusts the baseline to reduce this
tidal volume difference for the next breath. Figure 4-5 shows how the
ventilator adjusts the baseline.
Figure 4-5: Tidal volume adjustment
Auto-Trak+ (optional)
The Auto-Trak+ option for the Respironics V60/V60 Plus Ventilator lets you
further adjust the level of Auto-Trak Sensitivity, a feature that recognizes and
compensates for intentional and unintentional leaks. This algorithm has
multiple breath trigger and cycle thresholds. When you adjust Auto-Trak+
settings, you adjust these multiple trigger and/or cycle thresholds
simultaneously, retaining all the auto-adaptive features of Auto-Trak
Sensitivity.
The Normal Auto-Trak settings work well for most patients. Pediatric patients,
however, may benefit from more sensitive trigger settings, while some adult
patients may benefit from more or less sensitive cycle settings.
High flow therapy
High flow therapy (HFT) enables delivery of a humidified gas mixture at an
operator-set flow rate via a high flow nasal cannula interface or tracheal
adapter. The principle mechanism of action for high flow therapy is delivering
a known FiO
2
at a flow rate equal to or greater than the patient's peak flow,
thus minimizing dilution of the gas.
HFT provides blended gas to the patient at a targeted flow. Both O
2
concentration and flow are set by the clinician. Heated humidification is
recommended during high flow therapy.
Additional leak
introduced
New baseline
Volume adjustment
Flow
Volume