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Chapter 7
Operating Theory
REF 1057983 A Respironics V200 Ventilator Operator’s Manual 7-5
Positive End Expiratory Pressure (PEEP)
The PEEP pressure is the operator set baseline pressure maintained during
exhalation. All breaths are referenced to this baseline pressure and the
resulting pressure is in addition to the baseline pressure. Refer to Figure 7-5.
Figure 7-5: Positive End Expiratory Pressure (PEEP)
Rise Time Setting
Rise Time applies to all pressure targeted breaths — PSV, PCV, and IPAP in
NPPV. The operator can adjust the velocity of pressurization to better match
the patient’s demand for flow. Refer to Figure 7-6.
Figure 7-6: Rise Time
Patient Initiated Breath Triggering
Patient initiated breaths can be flow or pressure triggered in A/C, SIMV, CPAP
for Pressure or Volume breath types, or flow triggered in NPPV. The pressure
trigger level determines the amount of pressure below the baseline pressure
that the patient must create in order for the ventilator to deliver a breath. The
Flow Trigger level is the amount of flow that the patient must inspire from the
base flow in order for the ventilator to deliver a breath.