20
EXAMPLE:
Prescribed Parameters:
Tidal Volume
= 10 ml
Respiratory Rate
= 40 breaths/minute
I/E Ratio
= 1:2
Oxygen Concentration
= 60%
Machine Compliance Factor
= 0.5 ml/cm H
2
O
From CHART C:
Respiratory Cycle
= 1.5 secs.
Inspiratory Time
= 0.5 secs.
Expiratory Time
= 1.0 secs.
Multiplication Factor
= 120
Total Flow (V
I
) = Tidal Volume (V
t
) x Mult. Factor
10 ml x 120 = 1200 ml/min (1.2 liters/min)
or
Total Flow (V
I
) =
Tidal Volume (V
t
)
Inspiratory Time (T
I
)
Total Flow (V
I
) =
10 ml
0.5 sec
Total Flow (V
I
) = 20 ml/sec (1.2 liters/min)
From CHART A:
For 60% oxygen concentration
Oxygen Flow (V
I
O
2
) = 600 ml/min (0.6 liters/min)
Air Flow (V
Air
) = 600 ml/min (0.6 liters/min)
STEP 6 Attach test lung to WYE and observe proper cycling. If operation is
normal, remove test lung and determine compliance of system as
follows:
a) Plug WYE port, which connects to patient airway.
b) With parameters set for prescribed tidal volume, observe
maximum reading on pressure gauge during inspiratory time.
If gauge reading is over 70 cm H
2
O, temporarily reduce tidal
volume by lowering flow rate and/or inspiratory time so that
