Viasys 3100, 3100A Quick reference card

1. BIAS FLOW - Adjusting Bias Flow will affect mean Paw.

Premature 8-15 LPM Nearterm 10-20 LPM
Small child 15-25 LPM Large Child 20-30 LPM
Lowering Bias Flow may decrease work of breathing and facilitate weaning.

2. ADJUST - Sets the mean airway pressure

This control directly affects lung volume and oxygenation.
Initial setting is slightly higher than conventional ventilation.

3. POWER - Controls piston displacement

Start with a power of 2.0 and adjust for chest wiggle to umbilicus
Adjust to achieve optimal PaCO2.

4. INSPIRATORY TIME % -

Set to 33% for most applications

For some patients, increasing inspiratory time % to 50 can improve ventilation and
increase lung recruitment.

Once set, this control is not typically changed.

5. FREQUENCY - Breath rate is expressed in hertz.

One hertz equals 60 breaths per minute (BPM).
Initial frequency settings are dependent on patient size and lung pathophysiology.

Generally, the smaller the patient the higher the frequency. Lower frequencies are
employed for larger childen and management strategies designed to minimize the
potential for gas trapping

A decrease in frequency = increased tidal volume.
An increase in frequency = decreaded tidal volume.

© 2003 VIASYS Healthcare

3100A Quick Reference Card

CONTROLS AT A GLANCE

3

1

4

5

2

WHILE ON HFOV:

Wean FiO2 as tolerated to target FiO2.

Once FiO2 is < target FiO2, begin to wean mean airway pressure by increments of 1-2 cmH2O.
Assess for adequate lung inflation with chest x-ray and arterial PO2.

Assess oxygenation with pulse oximetry.

IN AIR LEAK SYNDROME: Mean airway pressures are similar to those used in

conventional ventilation. Higher FiO2's are typically used.

TRANSITION TO CONVENTIONAL VENTILATION, NCPAP,
or Nasal Cannula, when each of the following parameters are met:

1) Mean airway pressure is stable and appropriate for the pathology

2) Patient tolerates position changes and procedures well

3) ABG's are acceptable and stable

These guidelines are recommedations only. For any treatment each physician must determine the
appropriateness of these guidelines as they apply to specific patients.

Mean airway pressure is regulated by controlling the inflation of the balloon valve in the expiratory limb
of the circuit (Figure 1). As inflation pressure inside the balloon increases, the outflow of gas is restricted,
providing mean airway pressure.

P/N 775895-101A

WEANING GUIDELINES

VALVE ASSEMBLY LOCATIONS

MEAN AIRWAY PRESSURE

A.

Red - Dump Valve, mid expiratory limb.

B. Green - Mean Airway Pressure, expiratory limb.
C. Blue - Limit Valve, inspiratory limb

A

B

C

FIGURE 1

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