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10. PEEP ZERO
Set ON/OFF switch to ON. Observe manometer. No pressure should be indicated
during the expiratory phase.
11. INSPIRATORY EFFORT
Remove occlusion from patient end of circuit. Set ON/OFF switch to ON. With 15 ±5
cm of negative pressure applied to the patient circuit, the DEMAND INDICATOR
should activate and the unit should trigger (initiate a breath). Turn the
INSPIRATORY EFFORT knob CCW until the unit auto-cycles (demand triggers at
the end of every inspiratory phase). Slowly turn the knob back CW until the unit
stops auto-cycling. A demand of 0.5 cm of negative pressure applied to the patient
circuit should trigger a pressurized breath.
Install the test lung on patient circuit. Turn the PEEP knob fully CCW. Turn the
INSPIRATORY EFFORT fully CCW. If the unit does not auto-cycle at this point,
slowly decrease the PEEP pressure until the unit does auto-cycle. This must occur
before the PEEP pressure has been reduced to less than 20 cm.
12. INSPIRATORY TIMES
Attach the patient end of the patient circuit to a test instrument used for measuring
inspiratory time. Set ON/OFF valve to ON. While turning the INSPIRATORY TIME
knob in a CCW direction, verify that all indicated times are within ±10% of panel
values.
13. EXPIRATORY TIMES
Set up as in #12. While turning the EXPIRATORY TIME knob in a CCW direction,
verify that all indicated times are within ± 10% of panel values. While the unit is in
inspiratory, move the EXPIRATORY TIME knob CW to the full IMV position,
against the stop. For an accurate reading of the back-up timer it is important that
the expiratory knob be positioned against the stop before the end of the inspiratory
phase. The back-up timer should trigger the unit into inspiratory, indicating an
expiratory time between 9.0 and 12.0 sec. As the unit continues to be cycled by the
back-up timer, the expiratory times should not decrease to less than 9.0 seconds.
14. MAXIMUM IMV TIME
Set up as in #12. Set EXPIRATORY TIME knob against the stop in the IMV range.
Set NORMAL/SIMV to SIMV. Set ON/OFF switch to ON. Turn the INSPIRATORY
EFFORT knob CCW until the unit auto-cycles. Using a stopwatch, measure the
time between observed pressurized breaths. This time should be between 45-150
sec.
15. FLOW RATES
Attach the patient end of the patient circuit to a test instrument used for measuring
flow. Set ON/OFF valve to ON. Verify that indicated flow rates are within ±10% of
panel values. Turn FLOW RATE knob in a CCW direction.
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