XVIVO Perfusion System (XPS
TM
) Instructions for Use
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100
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P/N: 9182
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0189 Revision Q
Parameter (unit)
Definition
AutoPEEP (cmH2O)
The difference between the set PEEP and the calculated total PEEP within the lungs.
AutoPEEP is the abnormal pressure generated by air "trapped" in the alveoli due to
inadequate lung emptying. Ideally, it should be zero. AutoPEEP is calculated using
the LSF method applied to the entire breath.
When AutoPEEP is present, volutrauma or barotrauma might develop. In active
patients, AutoPEEP may present an extra workload to the patient.
AutoPEEP or air trapping may result from an expiratory phase that is too short,
which may be observed under these conditions:
•
Delivered tidal volume too large
•
Expiratory time too short or respiratory rate too high
•
Circuit impedance too high or expiratory airway obstruction
•
Peak expiratory flow too low
Cstat (ml/cmH20)
Static compliance of the respiratory system, including lung and chest wall
compliances. It is calculated using the LSF method, which is a statistical technique
called the least squares fitting method. This method is applied on a breath
-
by
-
breath basis and is most accurate when the patient is very relaxed. Cstat can help
diagnose changes in elastic characteristics of the patient
’
s lungs.
Exp Flow (l/min)
Peak expiratory flow
ExpMinVol (l/min)
Expiratory minute volume. The moving average of the monitored expiratory volume
per minute over the last 8 breaths.
fTotal (b/min)
Total breathing frequency. The moving average of the lung
’
s total breathing
frequency over the last 8 breaths, including both mandatory and spontaneous
breaths.
I:E
Inspiratory:expiratory ratio. Ratio of the patient
’
s inspiratory time to expiratory time
for every breath cycle. This includes both mandatory and spontaneous breaths.
Insp Flow (l/min)
Peak inspiratory flow, spontaneous or mandatory
Leak (%)
Leakage percent. The percentage of the delivered inspiratory volume (VTI) that is not
returned during exhalation, averaged over the past 8 breaths. Leak can indicate
leaks on the patient side of the Flow Sensor (endotracheal tube). It does not include
leakage between the ventilator and Flow Sensor.
Oxygen (%)
Oxygen concentration of the delivered gas. It is measured by the oxygen cell in the
inspiratory pneumatics. This parameter is not displayed if the oxygen supply is not
connected; if the oxygen cell is not installed, is defective, or is not a genuine
HAMILTON MEDICAL part; or if oxygen monitoring is disabled.
PEEP/CPAP (cmH2O)
Monitored PEEP (positive end expiratory pressure)/CPAP (continuous positive airway
pressure). The airway pressure at the end of exhalation.
Pmean (cmH20)
Mean airway pressure. The absolute pressure, averaged over the breath cycle.
Pmean is an important indicator of the possible impact of applied positive pressure
on hemodynamics.
C3 Ventilator
8.8 Monitored Parameters
