CAE Healthcare Fidelis Lucina, User Manual

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Müse Parameter Descriptions
283
Tidal Volume
The Tidal Volume parameter is used to set the tidal volume to a given volume per breath. Once tidal
volume is set to a numeric value, arterial oxygen and carbon dioxide values have no effect on the tidal
volume, but continue to influence other components of the physiological models.
For example, with the tidal volume set to 600 mL in the adult simulator, the tidal volume remains a
constant (set) 600 mL even in the event of falling arterial oxygen levels. In such situations, the patient
can only respond to arterial oxygen or carbon dioxide levels when the respiratory rate is adjusted.
Default : Modeled
Range : 0 mL - 2500 mL
Tidal Volume Factor
The Tidal Volume Factor (along with the Respiratory Rate Factor ) parameter is used to change the
baseline tidal volume (before the control-of-breathing and drug influences are taken into account.) A
value of 2 doubles the baseline
tidal volume. A value of 0.5 decreases the baseline tidal volume by 50%.
Default : 1
Range : 0.10 - 4.00
TIP : First decrease the respiratory gain factor to reduce the influence of the respiratory control
mechanism on the respiratory rate and tidal volume.
pH Shift
The pH Shift parameter is used to create a metabolic acidosis or metabolic alkalosis under script
control.
The default pH value displayed on the Patient Status Display or TouchPro software is dependent on
respiratory arterial CO
2
values. Under default conditions (PaCO
2
= 40 mmHg), the pH is approximately
7.4. Rising arterial CO
2
produces a subsequent drop in pH, while falling arterial CO
2
levels result in rising
pH values.
To simulate pH changes with metabolic changes (acidosis or alkalosis), the pH Shift value is a
mathematical addition to (or subtraction) from the displayed pH value to that which is desired.
Default : 0
Range : -(0.50) - 0.50