When do you use HFJV?

When do you use HFJV?

Both modalities of HFV are used for various indications; however, HFJV is thought to be more beneficial in nonhomogenous lung disease and air leak, as it allows for passive expiration and adjustment of inspiratory time, and it enables adequate gas exchange with lower mean airway pressures (Zobel 1994; Cotten 2001).

What is the difference between HFOV and HFJV?

High-frequency jet ventilation (HFJV) is significantly different from HFOV. Through a pneumatic valve, it releases short jets of gas in the inspiratory circuit, and expiration is passive. The inspiratory-expiratory ratio is adjustable, which can be of interest for cases of hypercapnia.

How do I set up HFOV?

Start at a frequency of 10 Hz and a Power of 3.0 to 5.0 (amplitude/delta P 35-45 cm). Initial MAP 4 cm above MAP while on CMV. Check CXR 1-2 hrs after converting to HFOV, then adjust MAP to achieve optimal lung volume (9 ribs expanded with improved aeration).

What does high frequency ventilation do?

Higher frequencies are useful to decrease barotrauma as the pressure change transmitted to alveoli is less at high frequencies. This also increases the zone of safety for ventilation and leads to homogenous aeration of alveoli.

When do you use high frequency jet ventilation?

Nonventilated lung high-frequency jet ventilation (HFJV) may be considered when the application of CPAP is either impractical or hazardous during OLV. Some of the indications for nonventilated lung HFJV include BPF, surgery of the major airways, and acute respiratory distress syndrome (ARDS).

What causes pulmonary interstitial emphysema?

What causes pulmonary interstitial emphysema? PIE most often happens in preterm infants. It occurs when their lungs don’t make enough of a substance called surfactant. Surfactant allows alveoli to be more flexible and less likely to break open.

How do I calibrate my HFOV?

Perform circuit calibration: Switch machine on. Depress and hold reset. Observe PAW display for a reading of 39-43cm H₂O. Adjust bias gas flow slightly to achieve this if necessary.

What is a chest wiggle?

In high-frequency oscillatory ventilation (HFOV), the rapid movements of the chest wall of the patient in response to the delivery of small volumes of gas into the airways several times a second.

Is high frequency ventilation used in adults?

High-frequency oscillatory ventilation (HFOV) is a lung-protective strategy that can be utilized in the full spectrum of patient populations ranging from neonatal to adults with acute lung injury. HFOV is often utilized as a rescue strategy when conventional mechanical ventilation (CV) has failed.

How do you set up a jet vent?


  1. The patient should be supine.
  2. First identify the cricothyroid membrane.
  3. Use the largest IV catheter possible, such as a size 10 or 14 gauge in the adult.
  4. Attach a 10 ml syringe to the hub of the needle.
  5. Once you have entered the trachea, slide the catheter off the needle into the trachea.

Is interstitial emphysema a form of COPD?

Emphysema is a type of chronic obstructive pulmonary disease (COPD). In this condition, the air sacs in the lungs become damaged and stretched. This results in a chronic cough and difficulty breathing. Smoking is the most common cause of emphysema, but other factors can also cause it.

How is pulmonary interstitial emphysema treated?

Treatment may include:

  1. Lying your baby on the side with the air leak, which helps move more air into the lung that is working well.
  2. Lowering ventilator pressure if possible, to help prevent more air leaks.
  3. Using high-frequency oscillatory ventilation, which may lower pressure in the air sacs.
  4. Giving extra oxygen.

What is bias flow on HFOV?

During high frequency oscillatory ventilation (HFOV), bias flow is the continuous flow of gas responsible for replenishing oxygen and removing carbon dioxide (CO2) from the patient circuit. Bias flow is usually set at 20 liters per minute (lpm), but many patients require neuromuscular blockade (NMB) at this flow rate.

What is Delta P on oscillator?

Delta P or power is the variation around the MAP. Mechanism. Oxygenation and CO2 elimination are independent. Oxygenation is. dependent on MAP.

What are the initial settings of the HFJV?

Initial HFJV settings 1 First Intention Use in Extremely Premature Infants. Primary goal of this approach is to minimize mechanical injury from air trapping and/or hyperinflation. 2 Rate (frequency) and inspiratory time. 3 PIP (peak inspiratory pressure) The jet functions as a pressure limited ventilator. 4 PEEP and sigh breaths.

How does HFJV work?

HFJV utilizes delivery of oxygen using small VT (<2 mL/kg) at very fast rates (100 to 400 breaths/minute). Gas exchange during HFJV occurs by several mechanisms: mass movement, enhanced molecular diffusion, coaxial gas flow, and pendelluft movement.

How do you set the peep on HFJV?

The PEEP on HFJV is set by using the conventional ventilator that is in-line with the jet. Oxygenation on HFJV is directly proportional to MAP which is similar to CMV; however, with HFJV, the MAP should be generated primarily by PEEP with a contribution from the PIP. The greater the delta P, the larger the contribution of the PIP to the MAP.

How do I explain the HFJV to the parents?

 Explain the purpose and function of the HFJV to the parents, stressing that the neonate will appear to have rapid vibrations of the chest wall, but will also be able to breathe spontaneously.  Promote parental involvement in care as much as possible.