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V. SELECTION OF VENTILATION PARAMETERS AND
ADJUSTMENT OF CONTROLS
A. TIME-CYCLED OPERATION
(FOR AUTOMATIC VENTILATION (e.g. IPPV, IMV, with or without PEEP))
Determine and note patient requirements for tidal volume, respiratory rate, I/E
ratio, and oxygen concentration. Refer to CHART C, to find inspiratory time (T
I
),
expiratory time (T
E
), and MULTIPLICATION FACTOR to compute flow rate for
required tidal volume.
STEP 1 Set PIP control fully counterclockwise, PEEP/CPAP control fully
clockwise.
STEP 2 Set INSP. TIME and EXP. TIME controls in a clockwise direction to
required times.
STEP 3 Determine total flow (V
I
) required by multiplying the required tidal
volume (V
t
) by the approximate MULTIPLICATION FACTOR (from
CHART C) or by use of slide rule. Set flow rate controls for this total
flow.
STEP 4 Set CYCLE/CPAP switch in CYCLE position.
STEP 5 For oxygen concentration (FIO
2
) other than air or 100% oxygen, set by
adjusting integral flow rate controls, or by adjusting external oxygen
blender:
a) Using integral flow rate controls, refer to CHART A, which relates
oxygen, air, and total flows to oxygen concentration. Set air and
oxygen flow for required concentration and total flow determined in
Step 3.
b) Using external oxygen blender, set blender for prescribed
concentration, and integral flow rate control for required total flow.
NOTE: Output from oxygen blender must be connected to
POWER OXYGEN fitting. If required flow exceeds10 liters/minute,
output of blender is connected to both POWER OXYGEN and AIR
fittings, using a Y adapter (not supplied). BMD accessory #2022.
