23
Set expiratory time for desired rate of automatic cycles. Rate in
respirations/minute is equal to 60 divided by the sum of inspiratory
and expiratory times in seconds.
Rate (f) =
60
Insp. (T
I
) + Exp. times (T
E
)
IMV is normally introduced and adjusted by increasing expiratory time.
B. NON-CYCLED OPERATION
(FOR CONTINUOUS FLOW PAST PATIENT WITH OR WITHOUT
POSITIVE AIRWAY PRESSURE, e.g. CPAP, COAD).
Determine prescribed oxygen concentration.
STEP 1 Set PEEP/CPAP control fully clockwise.
STEP 2 Set CYCLE/CPAP switch to CPAP position.
STEP 3 Empirically determine total flow required by setting flow so that the
pressure gauge reading does not drop during patient inhalation
STEP 4 For oxygen concentration other than air or 100% oxygen, set by
adjusting integral flow rate controls according to CHART A, or by
adjusting external oxygen blender.
STEP 5 If CPAP is to be used, connect test lung to WYE. Set CPAP level by
adjusting PEEP/CPAP control for desired level as indicated by
MVP-10 pressure gauge. Disconnect test lung. Note that CPAP level
is somewhat sensitive to flow rate. PEEP/CPAP control should be set
at the flow rate used.
STEP 6 Connect the patient airway to WYE. If CPAP is being used, observe
level and adjust if necessary.
NOTE: If MVP-10 pressure gauge reading drops significantly
during patient inhalation, the flow rate should be increased.
