22
With patient airway connected to WYE, observe maximum
pressure during cycle.
Detach patient airway from WYE and block patient port of WYE.
Adjust PIP control so cycle pressure is 5 to 10 cm H
2
O higher
than PIP with patient connected.
Re-connect the patient airway to WYE.
The MVP-10 will now be limited to the tidal volume determined
by the flowmeter and INSP. TIME settings, and will be limited
to a maximum pressure in case resistance or compliance
characteristics change.
b) For Pressure-limited operation - Observe maximum pressure
during inspiratory time.
Adjust ADJUSTABLE RELIEF VALVE (pre-set at factory to
open at 70-80 cmH
2
O depending on flow) by occluding patient
port
of WYE
and
turning
knurled
adjusting
cap
counterclockwise until valve relieves pressure at 5 to 10
cmH
2
O above desired pressure limit. Use lock ring to secure
adjusting cap.
Adjust PIP control until the desired pressure limit is
seen during inspiration. Note that the PIP level is
somewhat affected by the flow rate. It should be set with the
particular flow rate used.
The MVP-10 will now be limited to the pressure set. When
operating in this mode, the exact Tidal Volume is unknown,
since gas is vented to the atmosphere as soon as the pre-set
pressure limit is reached during each inspiration. Calculation
of and compensation for compliance losses are unnecessary.
STEP 9 If PEEP is to be used, set the desired level using the PEEP/CPAP
control. Adjust control until the pressure gauge indicates the desired
level during the expiratory time. Note that the PEEP level is
somewhat sensitive to flow rate. The PEEP control should be set
with the flow rate used.
STEP 10 For Intermittent Mandatory Ventilation (IMV) determine prescribed
tidal volume, inspiratory time, and rate of automatic cycles. Calculate
flow rate:
Flow (V
I
) =
Tidal Volume (V
t
)
Inspiratory Time (T
I
)
