OPRHT70 A0310
10-1
Explanation of Modes and Controls
10
A/CMV Mode
(Assist/Control Mandatory Ventilation)
In A/CMV mode, time activated (mandatory) breaths are delivered
in accordance with the RR setting. Patients can trigger mandatory
breaths in addition to, or in place of, time activated (mandatory)
breaths if the effort they generate causes airway pressure to meet
the Ptrig setting. Every such patient effort results in a mandatory
breath. The breath can be volume or pressure controlled. PEEP/CPAP
may be added. In Pressure Control, tidal volume is determined by
the target pressure, i time, and patient respiratory mechanics and in
Volume Control, by the tidal volume setting.
SIMV Mode
(Synchronized Intermittent Mandatory Ventilation)
In SIMV mode, patients receive a fixed number of volume or pressure
controlled mandatory breaths (time or patient activated) and may
breathe spontaneously between mandatory breaths, with or without
pressure support (PS)*. PEEP/CPAP may be added.
The first patient triggered 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 triggered or patient triggered) the patient receives in 60
seconds to the RR (b/min) setting.
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 PS) or Bi-level Positive Airway Pressure (with PS). Ensure
that Ptrig is set so the HT70 detects all spontaneous patient efforts.
* Not available on all models
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