Pft Unit 2

Front 1

What is NIF?

Back 1

1)Negative pressure generated by the muscles of inspiration at RV against an occluded airway

Front 2

When is NIF used?

Back 2

1)As a weaning parameter in ventilator discontinuance
2)To assess inspiratory muscle strength in neuromuscular disease, paralysis, and disease of the chest wall

Front 3

What is a normal range for NIF?

Back 3

Normal range greater than (-) 80 cm H20.

Front 4

What is the danger zone for NIF?

Back 4

Around 20 cm H2O

Front 5

What is MEF?

Back 5

Positive pressure by the muscles of exhalation at TLC against an occluded airway

Front 6

What is a normal range for MEF?

Back 6

80-120 cm H20.

Front 7

What is MEF used for?

Back 7

To assess inspiratory muscle strenght in neuromuscular disease, paralysis, disease of the chest wall, and COPD

Front 8

Pascal's Law

Back 8

Pressure at one end of the tube will equal pressure at the opposite end of the tube in a closed system.

Front 9

Testing methods for body box

Back 9

1)Tight seal with a bite block mouthpiece and noseclips
2)At FRC, gentle pant at 1-2 BPS for two seconds against a closed shutter. The pressure at the airway will equal the pressure at the alveoli.
3)P airway and P box are measured simultenously.
4)Box factor takes into account the weight. When FRC is calculated, the volume will be adjusted according to the box factor.

Front 10

Body Box advantages

Back 10

1)Accuracy
2)Measures TGV or all the gas in the thorax, including areas not in contact with the airways
3)More than one test may be completed to ensure optimal performance and repeatability in a short period of time
4)Patient's performance requirements are minimal.

Front 11

Acceptability Factors for the body box

Back 11

1)Closed panting loop with no artifact
2)Panting begins at FRC
3)Pressure and frequency values are within normal limits

Front 12

Repeatability Factors

Back 12

1)FRC values are within 10 percent
2)Tangent values are within 10 percent

Front 13

Body Box errors

Back 13

1)Leaks around the door
2)Leaks at the mouth
3)calibration errors
4)Patient effort
5)Panting force or rate
6)"unnatural FRC"(FRC shift during seperate manuveur)

Front 14

Body Box disadvantages

Back 14

1)Patient fit in box
2)Patient cooperation
3)Claustrophobia
4)expense

Front 15

If there is a door leak, FRC will be___

Back 15

1)Lower than normal.

Front 16

If the patient does not have a good lip seal, FRC will be___

Back 16

1)Higher than normal

Front 17

How to calculate the box factor

Back 17

(volume of air in box)-(weight on individual in liters) all divided by volume of air in box in liters