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V. SELECTION OF VENTILATION PARAMETERS AND
ADJUSTMENT OF CONTROLS
A. INTERMITTENT POSITIVE PRESSURE VENTILATION (IPPV) WITH
OR WITHOUT PEEP
Determine and note patient requirements for respiratory rate, I/E ratio and tidal volume.
Refer to Table I to find inspiratory time (T
I
) and expiratory time (T
E
). Obtain the correct flow
rate setting for the desired title volume at the set inspiratory time, from Table II.
Step 1- set ON/OFF selector to ON.
Step 2- set CYCLE/CPAP-MANUAL switch to cycle position.
Step 3- set NORMAL/SIMV switch to normal position.
Step 4- set maximum pressure control fully counterclockwise (maximum),
PEEP/CPAP control fully clockwise (zero).
Step 5- adjust insp. time and exp. time controls to required settings.
Step 6- set flow rate control to proper position to give desired tidal volume
according to Table II.
Step 7- set desired oxygen concentration with blender control.
Example:
Prescribed parameters:
Tidal Volume = 500 ml
Respiratory Rate = 20
I/E Ratio = 1.2
From Table I:
Insp. Time = 1.0 sec.
Expiratory Time = 2.0 sec.
From Table II:
Flow rate = 30 LPM (0.5 L/sec.)
[Tidal volume (liters) = flow rate (L/sec) X Insp. Time (sec.)]
Step 8
- ATTACH TEST LUNG TO PATIENT PORT AND OBSERVE PROPER
CYCLING.
Step 9
- connect to patient.
Step 10- set inspiratory effort control for proper patient triggering.
Step 11- volume-limited or pressure limited operation is established as follows:
a) For volume limited operation - set the MAX. PRESSURE control fully
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