Quality Control Test for Measuring Thoracic Gas Volume

Introduction

• Quality control is crucial to ensure system functionality.
• This guide demonstrates performing a quality-control test using an isothermal bottle.

Equipment & Setup

1. Isothermal Bottle Connection

   • Remove the screw on the bulkhead cover and open it.
   • Disconnect the umbilical connector from the purple Gore fitting (mouth port).
   • Attach the tube from the isothermal bottle to this port.

2. Test Subject Setup

   • Add a new patient for the test.
   • Ensure BTPS correction is unchecked for syringe mode testing.
   • Enter subject's height and weight; add 12 pounds to account for bottle displacement.

3. Testing Environment

   • Navigate to the "Plath" testing screen.
   • Place the subject in the box with the isothermal bottle and seal the door.
   • Wait 30 seconds for box calibration.
   • Stabilize the bottle using a book to prevent warming.

Testing Procedure

1. Tidal Breathing & Shutter Operation

   • Click "TGV Start" and have the subject perform tidal breathing with the flow sensor.
   • No need to attach the flow sensor to the patient's head.
   • After 4 stable breaths, press spacebar to close the shutter.

2. Syringe Pumping

   • Subject pumps syringe at a rate of once per second.
   • Subject holds breath when shutter is closed.

3. Repeating the Test

   • Press spacebar again to repeat the procedure.
   • Use wrist action for syringe pumping to avoid artifacts.
   • Complete 4 to 5 effort cycles.

Results Review

• Examine each effort to verify angles are correct.
• Adjust line of best fit as necessary.
• Select several acceptable efforts to average.
• The average TGV values should be within ±5% of the bottle's labeled volume.

Troubleshooting

• If TGV values are not within range, contact technical support at 1-800-333-4137.