CAE Athena - Respiratory Rate; Respiratory Rate Factor; Etco2

Müse Parameter Descriptions
203
PN: 905K520652 v2.8
Respiratory Rate
The Respiratory Rate parameter is used to set the respiratory rate to a given number of breaths per
minute. Once set, arterial oxygen and carbon dioxide values have no effect on the resulting
respiratory rate, but continue to influence other components of the physiological models. The
patient continues to breathe at the set number of breaths per minute, regardless of the arterial
oxygen or carbon dioxide levels.
For example, when the respiratory rate is set to 10 breaths per minute, the respiratory rate remains
at 10 breaths per minute, regardless of arterial oxygen or carbon dioxide levels. In such situations,
the patient can only respond to arterial oxygen or carbon dioxide levels by altering the tidal volume,
either automatically via the model-driven controls or when the Tidal Volume parameter is adjusted.
Default: Modeled
Range: 0 breaths per minute - 40 breaths per minute
Respiratory Rate Factor
The Respiratory Rate Factor parameter (along with the Tidal Volume Factor parameter) is used to
change the baseline respiratory rate (before the control-of-breathing and drug influences are taken
into account). A value of 2 doubles the baseline respiratory rate. A value of 0.5 decreases the baseline
respiratory rate by 50%. Changing the respiratory rate using this parameter maintains the
physiological models.
Default: 1
Range: 0.01 - 6.00
TIP: First decrease the respiratory gain factor to reduce the influence of the respiratory control mechanism
on the respiratory rate and tidal volume.
EtCO
2
The EtCO
2
parameter is used to set the end-tidal CO
2
to a fixed numeric value, measured in mmHg,
regardless of the minute ventilation. The end exhalation point of the capnogram waveform will also
reflect the set end-tidal CO
2
value. Setting the EtCO
2
has no effect on the arterial carbon dioxide values
(PaCO
2
), respiratory rate or tidal volume.
For example, when the EtCO
2
is set to 50 mmHg, the numeric end-tidal CO
2
will display a value of 50
mmHg and the capnogram waveform rises to an end-tidal of 50 mmHg. However, the respiratory rate
and tidal volume will remain the same unless the Respiratory Rate and/or the Tidal Volume
parameter(s) is adjusted.
Default: Modeled
Range: 0 mmHg – 100 mmHg