| Ventilation Mode | Description | |
| A) VOLUME MODES | ||
| 1. Assist-Control Ventilation (ACV), also called Continuous Mandatory Ventilation (CMV) | This is the most common form of ventilation and you frequently see it on medicine floors. “Each breath is either an assist or control breath, but they are all of the same volume. The larger the volume, the more expiratory time required. If the I:E ratio is less than 1:2, progressive hyperinflation may result.” Don’t use ACV in patients who breathe rapidly. Using ACV may induce both hyperinflation and respiratory alkalosis. |
ACV vs. SIMV “Personal preference prevails, except in the following scenarios: 1. Patients who breathe rapidly on ACV should switch to SIMV 2. Patients who have respiratory muscle weakness and/or left-ventricular dysfunction should be switched to ACV” Open Anesthesia |
| 2. Synchronized Intermittent-Mandatory Ventilation (SIMV) | ||
| B) PRESSURE MODES | ||
| Pressure-Controlled Ventilation (PCV) | ||
| Pressure Support Ventilation (PSV) | -The patient initiates all the breathes and frequency. This is different from pressure control where you can actually set the rate. | |
| C) OTHER MODES | ||
| CPAP | ||
| T-Piece | ||
| ECMO, ECCO2R | ||
“Note that mechanical ventilation does not eliminate the work of breathing, because the diaphragm may still be very active.”
Check out this excellent link: https://www.openanesthesia.org/modes_of_mechanical_ventilation/
Also, watch these videos.
Classification of Ventilator Modes
– Triggering: how a breath is initiated
– Cycling: switch from inhalation to exhalation
– Inspiratory controls: how breath is delivered
– Expiratory controls: limits on exhalation (if any)
or
- the trigger (flow versus pressure),
- the limit (what determines the size of the breath), and
- the cycle (what actually ends the breath).