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XVIVO Perfusion System (XPS
TM
) Instructions for Use
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101
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P/N: 9182
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0189 Revision Q
Parameter (unit)
Definition
Ppeak (cmH2O)
Peak airway pressure. The highest pressure during the previous breath cycle. It is
influenced by airway resistance and compliance. It may differ noticeably from alveo-
lar pressure if airway flow is high.
RCexp (seconds)
Expiratory time constant. The rate at which the lungs empty, as follows:
Actual TE (expiratory time) % emptying:
1 x RCexp 63%
2 x RCexp 86.5%
3 x RCexp 95%
4 x RCexp 98%
RCexp is calculated as the ratio between VTE and flow at 75% of the VTE. In adults,
an RCexp value above 1.2 s indicates airway obstruction, and a value below 0.5 s
indicates a severe restrictive disease.
Use RCexp to set optimal TE (Goal: TE
x RCexp): In passive patients: Adjust rate
and I:E.
These actions may reduce the incidence of AutoPEEP.
Rinsp (cmH20/(l/s))
Resistance to inspiratory flow caused by endotracheal tube and the patient
’
s
airways, during inspiration. It is calculated using the LSF method applied to the
inspiratory phase.
TE (seconds)
Expiratory time. In mandatory breaths, TE is measured from the start of exhalation
until the set time has elapsed for the switchover to inspiration.
TI (seconds)
Inspiratory time. In mandatory breaths, TI is measured from the start of breath
delivery until the set time has elapsed for the switchover to exhalation.
VTE (ml)
Expiratory tidal volume. The volume exhaled by the lung. It is determined from the
Flow Sensor measurement, so it does not show any volume added due to compres-
sion or lost due to leaks in the breathing circuit. If there is a gas leak on the lung side,
the displayed VTE may be less than the tidal volume the patient actually receives.
VTI (ml)
Inspiratory tidal volume. The volume delivered to the lung. It is determined from the
Flow Sensor measurement. If there is a gas leak on the lung side, the displayed VTI
may be larger than the displayed VTE.
C3 Ventilator
8.8 Monitored Parameters