CAE Athena - Shunt Fraction; Spo2; Neuromuscular Blockade (NMB)

Müse Parameter Descriptions
204
CAEAthena
PN: 905K520652 v2.8
Shunt Fraction
The Shunt Fraction parameter is frequently used to assist in desaturating a patient. This parameter
creates a physiologic “bypass” of the normal pulmonary circulation, resulting in changes in O
2
, CO
2
and anesthetic gases at the alveolar level. Typically, values of 0.1 to 0.4 are needed to create large
alveolar-arterial oxygen gradients sufficient to cause arterial hypoxemia.
Default: 0.02
Range: 0.00 - 0.50
TIP: If the parameter is set high (0.5), the patient desaturates rapidly and responds negatively to the
administration of supplemental O
2
.
SpO
2
The SpO
2
parameter is used to override the normal pulmonary circulation and set the SpO
2
at a fixed
numeric value, regardless of the oxygen applied. Resetting to Modeled returns control of the
underlying SpO
2
to the physiological models. If SpO
2
is set to less than 75%, the eyes will
automatically close when in the Auto mode.
Default: Modeled
Range: 0% - 100%
Neuromuscular Blockade (NMB)
The degree of NMB is automatically determined by pharmacokinetic and pharmacodynamic models,
which are based on the neuromuscular blocking agents administered and the time course of their
injection. For some educational applications, however, the instructor may wish to set a fixed degree
of neuromuscular blockade that remains stable for an indefinite period. This can be accomplished
using the NMB parameter. The default setting instructs the pharmacologic models to determine the
degree of neuromuscular blockade based upon the drugs injected and their pharmacologic
properties.
When a numeric value is assigned to this parameter, the degree of NMB is set to that level. For
example, 80% NMB causes the simulator to set the degree of NMB to 80%, regardless of the presence
(or absence) of neuromuscular blocking drugs. Clinically, the spontaneous tidal volume is markedly
reduced. If NMB is set to greater than 30%, the eyes will automatically close when in the Auto mode.
Default: Modeled
Range: 0% - 100%