Operator's Manual
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4-3
(Psupport). See Figure 46 for a schematic illustration. PEEP/CPAP may be
added.
Figure 46 – Synchronized Intermittent Mandatory Ventilation (SIMV)
The first patient activated breath in any mandatory breath interval will be a
patient triggered mandatory breath. The patient has the rest of the interval
to breathe spontaneously. If the patient does not trigger the ventilator, and
one complete mandatory breath interval has elapsed, a time triggered
mandatory breath is delivered.
A mandatory breath lockout interval is activated whenever the patient
triggers a mandatory breath. This limits the number of mandatory breaths
(time activated or patient activated) the patient receives in 60 seconds to
the ƒ (b/min) setting.
As with all FLIGHT 50 Ventilator operating modes, Back-up Ventilation is
activated if the Low
I
alarm limit is violated.
4.5
SPONT MODE (Spontaneous Ventilation)
In SPONT mode, mandatory breaths are not delivered but the user can
adjust both PEEP/CPAP and pressure support (Psupport) levels. The patient
has control over each breath.
When PEEP/CPAP is set above 0, the ventilator mode is CPAP (without
Psupport) or Bi-level Positive Airway Pressure (with Psupport). Ensure that
Ptrig is set so the FLIGHT 50 Ventilator detects all spontaneous patient
efforts.
Entries for tidal volume, pressure control, ƒ, t
I
and Low Paw alarm limit are
all inactive in SPONT mode. However, users can preset these parameters for
future A/CMV or SIMV operation.