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Patient Spirometry
Static PEEPi measurement
In static PEEPi measurement, an end-expiratory pause (occlusion maneuver) of at
least four seconds is produced at the ventilator. When the airway is occluded at the
end-expiration, and if the patient is hyperinflated, alveolar pressures will equilibrate
with the airway pressure measured in D-lite(+)/Pedi-lite(+), which will rise until a
plateau is reached, corresponding to total PEEP or PEEPi, if set PEEP is 0.
NOTE
If both the dynamic and static PEEPi are measured, the
dynamic values are usually slightly lower.
●
x = Time
●
y = Paw
1. PEEPtot
2. End-expiratory pressure hold
3. Expiratory flow
I:E ratio
I:E ratio is an expression of the relationship of inspiration time to expiration time. A
typical value 0.5 means that the expiration time is twice the inspiration time. The
following examples illustrate the difference between I:E durations of 1:2 and 1:3.
If respiration rate is 10 breaths/min (respiration cycle 6 seconds) and I:E is 1:2, then the
inspiration time is 2.0 seconds and the expiration time is 4.0 seconds:
●
x = Time
●
y = V
1. Inspiration
2. Expiration
If respiration rate is 10 breaths/min (respiration cycle 6 seconds) and I:E is 1:3, then the
inspiration time is 1.5 seconds and the expiration time is 4.5 seconds:
332 CARESCAPE Modular Monitors 2062971-001