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Assist Control (AC) Mode
In Assist Control (AC) mode, the device delivers volume control therapy. This mode provides Assist and Mandatory breaths. An Assist breath is started when there is patient effort, but it is ended when the Inspiratory Time setting has been met. A Mandatory breath
is delivered if the patient does not spontaneously breathe within the prescribed BPM setting. This ensures that the patient receives a minimum number of breaths per minute. In this mode, the Tidal Volume is delivered during inhalation and PEEP is delivered during exhalation. The following illustration describes these concepts.
Tidal Volume = 500 mL | 2 | = Mandatory Breath |
Rate = 10 BPM | 3 | = Assist Breath |
Inspiratory Time = 2.0 seconds |
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Flow Pattern = Square |
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FLOW | 6 seconds | 5 seconds |
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50 |
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| Enter A/C mode |
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0 |
| 2 | 10 | 3 | 15 | 2 |
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| 20 |
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| TIME | ||
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| Assist Control Mode | |
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Synchronized Intermittent Mandatory Ventilation (SIMV) Mode
In Synchronized Intermittent Mandatory Ventilation (SIMV) mode, the device delivers both volume control and pressure control therapy. This mode provides Spontaneous, Assist, and Mandatory breaths. This mode uses a time window to decide what type of breaths should be delivered. This time window is the maximum time between breaths according to the set Breath Rate.
When you enter SIMV mode, the time window is started. If the patient does not provide any effort, the ventilator will provide a Mandatory Volume breath when the time expires and then begin the process again. Mandatory breaths deliver the Tidal Volume setting during inhalation and provide a lower Peak End Expiratory Pressure (PEEP) during exhalation.
