Dräger Perseus A500 Instructions For Use Manual page 86

Operation
WARNING
Risk of misinterpretation
Measured gas values and waveforms such as
the CO waveform are determined on the
2
basis of the composition of the sample gas.
The composition of the sample gas is
affected by many factors and their
interactions, especially in patients with low
body weight. This may result in biased
measurements or waveforms.
The following factors affect the sample gas
measurement:
– Dead space
– Patient resistance, patient compliance
– Type of surgical procedure
– Gas sampling site
– Breathing circuit, filter, sample line, tube
– Ventilation settings and the resulting
ventilation
– Leakage
– Spontaneous breathing
– Cardiogenic oscillations
Observe the following:
– Do not make therapeutic decisions based
solely on individual measured values or
parameters.
– If possible, minimize the effects of the
factors described above, e.g., take the
sample gas from a gas sampling site close
to the patient, minimize leakage, adjust the
ventilation settings.
CAUTION
Danger due to inaccurate gas measurement
values
Due to the technical characteristics of gas
measurements, the measured gas values might
be inaccurate at high respiratory rates and at
certain I:E ratios.
Observe the technical data.
86
WARNING
Risk of infection
Disease-causing germs can be transmitted
between patients via the circuit plug. If a used
Y-piece or filter is fitted to the circuit plug,
and then later a reprocessed component is
fitted (e.g., during a leakage test), the new
component may become contaminated.
Do not fit hoses that have already been used
and that have attached filters or Y-pieces to
the circuit plug. Instead, hang them over the
handle on the left-hand side of the device.
WARNING
Risk due to occluded components in the
breathing circuit
If filters, hoses, or endotracheal tubes are
occluded and sample gas is being taken from
between the patient and the occluded
component, the sample gas flow may lead
immediately to negative pressure in the
lungs.
Ensure the following when ventilating
pediatric patients and neonates:
– When fine pored filters are used, do not
connect the sample line between the tube
and the filter.
– When no filters but only an HME is in use,
set the alarm limits for MV low and Paw
high to values that are suitable for this
patient so that an incipient occlusion can
be detected.
CAUTION
Danger from an unintentional therapy start
If Perseus is in the Standby mode and the flow
control valves are open, ventilation starts in the
Man / Spon mode.
Take care that this does not happen
unintentionally.
Instructions for use Perseus A500 SW 2.0n