VENTILATOR 101

  • Types

    • 1. Volume targeted: patient gets set tidal VOLUME
      • - Pressure is variable
    • 2. Pressured targeted: patient gets set PRESSURE
      • - Volume is variable

    Common Modes

    • 1. Control: machine initiates breaths
      • - Pressure targeted
    • 2. Assist control: patient can initiate but machine will engage breath if rate falls below certain rate.
      • - Pressure OR volume targeted
    • 3. Intermittent mandatory (IMV): machine delivers set breaths, patient can breath spontaneously between.
    • 4. Synchronized IMV (SIMV): IMV but patient initiates breaths, prevents breath “stacking”.
    • 5. Pressure support (PSV): patient initiated, but pressure is controlled during breath.
    • 6. Pressure control (PCV): machine initiated breath with preset peak inspiratory pressure.
  • 1. Mode: SIMV, PCV, etc.
    2. Fraction of Oxygen (FiO2)
    3. Positive end expiratory pressure (PEEP)
    4. Pressure support (PS)

    5. Tidal volume- usually 6-10ml/kg ideal body wt.
    6. Respiratory Rate- normally 12-15
    7. Flowrate- normally 40-60 liters per minute
    8. Inspiration/Expiration ratio (I/E)- nl. adult 1:2
    9. Peak airway pressures
    10. Mean airway pressures
    11. Weaning parameters