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# Instrument Description This document describes various modes of ventilation on a ventilator, likely the Maquet Servo-i or Puritan-Bennett 840. ## Ventilation Modes ### Automode Combines pressure and volume support into a single mode. * **Absence of spontaneous effort:** Delivers mandatory brea...

# Instrument Description This document describes various modes of ventilation on a ventilator, likely the Maquet Servo-i or Puritan-Bennett 840. ## Ventilation Modes ### Automode Combines pressure and volume support into a single mode. * **Absence of spontaneous effort:** Delivers mandatory breaths in a time-triggered, pressure-limited, and time-cycled mode. * **Presence of spontaneous effort:** Switches to volume-support ventilation (VSV) with patient-triggered breaths ### Proportional Assist Ventilation (PAV) The ventilator proportionally assists the patient's spontaneous ventilation by amplifying the delivered pressure in proportion to the measured inspiratory flow and volume. ### Automatic Tube Compensation Automatically compensates for the resistance of the endotracheal tube, adjusting pressure based on tube size and type. * Eliminates airway resistance * Active during inspiration and expiration * Reduces air trapping and intrinsic PEEP **Other Details** * Clinician sets volume targets, PEEP, and pressure limits. * The next breath's inspiratory pressure increases if the tidal volume falls below the target.