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Table 7-1. Monitored parameters
Parame-
ter (unit)
Monitoring
Window
Definition
AutoPEEP
(cmH2O)
Monitoring 1
WARNING
The HAMILTON-G5’s automatic mea-
surement of AutoPEEP is accurate
only in patients without small air-
way collapse. DO NOT use this mea-
surement to quantify hyperinflation
in COPD patients. Refer to manual
for AutoPEEP measurement.
The difference between the measured and set
PEEP. AutoPEEP is the abnormal pressure gener-
ated by air “trapped” in the alveoli due to inad-
equate lung deflation. Ideally, it would be zero.
AutoPEEP is calculated using the LSF method
applied to the entire breath.
When AutoPEEP is present, volutrauma or
barotrauma can occur. In active patients,
AutoPEEP can cause an extra workload to the
patient.
AutoPEEP or air trapping can result from a too
short expiratory maneuver, which may be
observed under following circumstances:
• 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
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