What is the amplitude on HFOV?

HFV settings AMPLITUDE: a rough representation of the volume of gas flow in each high frequency pulse or “breath.” Adjust the amplitude until you achieve vigorous chest wall vibrations, usually occurs at an amplitude of 20-30.

What is the difference between HFOV and HFJV?

HFOV deliver tidal volumes smaller than the dead space by using a piston or a diaphragm with active inspiration and expiration (Cotten 2001; Courtney 2002;Courtney 2006), whereas HFJV is used in conjunction with CMV and delivers pulses of gas into the trachea with active inspiration and passive expiration (Cotten 2001; …

What controls oxygenation on HFOV?

mPaw controls oxygenation Typically, by setting a high Paw one can achieve maximal lung inflation, and thus maximal gas exchange.

What does high frequency ventilation ( HFJV ) mean?

Their function, their role in ventilating different respiratory dysfunction etiologies, and the patient population each is employed for can be similar or unique (Table). High frequency jet ventilation (HFJV) refers to HFV delivered using a jet of gas. It is initiated by inserting a catheter into the lumen of the endotracheal tube.

How is the HFOV attached to the oscillator?

Have to hand a syringe of saline to give 5-10 ml/kg as a bolus – starting HFOV often reduces venous return and affects BP. Some people attach directly to the oscillator, but it is probably better to oxygenate using hand ventilation, then clamp the ETT at inspiration, then attach to the HFOV.

What is the difference between HFJV and HFOV expiration?

In HFJV exhalation is passive (depends on passive lung and chest-wall recoil) whereas in HFOV gas movement is caused by in-and-out movement of the “loudspeaker” oscillator membrane. Thus in HFOV both inspiration and expiration are actively caused by the oscillator, and passive exhalation is not allowed.

How is oxygenation separated from ventilation in HFOV?

In HFOV, oxygenation can be separated from ventilation as they are not as dependent on each other as in conventional ventilation. Ventilation or CO2 elimination is dependent on amplitude (and to a lesser degree, frequency). What controls what? ** Changes in frequency are rare and should only be made in discussion with the consultant