Modes Of Mech Vent Flashcards
Mechanical ventilator modes are categorized based on?
- how the ventilator delivers breaths
- the control variables used
- how the patient interacts with the machine
The ventilator delivers a preset tidal volume with each breath, while the pressure varies depending on the patient’s lung compliance* and *airway resistance.
Volume control
Delivers a preset volume at a preset rate and flow.
Volume cotrol (V/C)
- breaths are delivered at a set volume, rate and flow.
- patient can trigger breath with the same Vt and rate as the controlled.
VOLUME SYNCHRONIZED INTERMITTENT MANDATORY VENTILATION (V-SIMV)
delivers a set volume with inverse I:E ratio.
VOLUME - INVERSE RATIO VENTILATION (V-IRV)
The ventilator delivers breaths with a preset inspiratory pressure. The tidal volume varies depending on the compliance and resistance of the lungs.
Pressure Control
all breaths are delivered at a preset PIP and Ti.
Pressure Assist Control (P-AC)/ Pressure Control (PCV)
The ventilator delivers mandatory breaths at a set pressure, ensuring that the patient receives a consistent level of inspiratory pressure with each breath, regardless of their lung compliance.
PRESSURE SYNCHRONIZED INTERMITTENT MANDATORY VENTILATION (P-SIMV)
a pressure-controlled mode that intentionally prolongs the inspiratory phase relative to the expiratory phase to improve oxygenation and lung recruitment.
PRESSURE - INVERSE RATIO VENTILATION (P-IRV)
The patient initiates the breath, and the ventilator provides support by delivering a preset pressure during inspiration, reducing the work of breathing.
PRESSURE SUPPORT VENTILATION (PSV)
used on both intubated or non-intubated patients.
BILEVEL POSITIVE AIRWAY PRESSURE (BiPAP)
INITIAL SET-UP of BIPAP
INITIAL SET-UP:
IPAP – 10-15 cmH2O
EPAP – 3-5 cmH2O
The patient breathes spontaneously, but the ventilator provides a constant level of positive pressure to keep the airways open and improve oxygenation.
CONTINUOUS POSITIVE AIRWAY PRESSURE (CPAP)
These are specialized modes used in more complex clinical situations, often for patients with severe respiratory failure or unique ventilation needs. These modes aim to optimize gas exchange, reduce the risk of ventilator-induced lung injury (VILI), and improve patient outcomes.
Advanced Modes