HOW CHANGES IN PEEP AFFECT AIRWAY

PRESSURES AND VOLUMES

Mariela FernandezJoseph D. Lowery

Jesse SparksEdited by Elizabeth Kelley Buzbee AAS, RRT-

NPS, RCP

Quick Overview

One Ventilator

Two Test Lungs

Hypothesis

Peep and airway pressure have a direct relationship whereas Peep and volume have an inverse relationship.

Two Test Lungs

Test Lung 1

• Compliance set at 50 ml/cmH2O

• Resistance set at 10

• Small capacity could not accommodate ventilator settings.

Test Lung 2AKA Blue Betty

•Compliance 40 cmH2O

• Resistance was set to 1

• (standard resistance for an ETT )

Ventilator Servo I Parameters Using Test Lung 1

Mode VC

FiO2 21%

Vt 400

I:E 1:3.4

Insp. Time 0.9

PEEP 0

Trigger 2

Pt. Parameters

Vt Exh 400

Test lung #1Volume Control

Peep 0 Peep 5 Peep 10 Peep 15 Peep 200

10

20

30

40

50

60

PeepPIPPaw

Pressure Control

Peep 0 Peep 5 Peep 10 Peep 15 Peep 200

100

200

300

400

500

600

0 5 10 15 2021 26 30 35 405 9 14 19 29

493

421

343

287251

Peep PIP Paw VTE

Ventilator Servo I Parameters Using Test Lung 2

Mode VC

FiO2 21%

Vt 400

I:E 1:3.4

Insp. Time 0.9

PEEP 0

Trigger 2

Pt. Parameters

Vt Exh 400

Volume Control 400ml

Peep 0 Peep 5 Peep 10 Peep 15 Peep 200

10

20

30

40

50

60

70

80

90

PeepPIPPaw

Pressure Control Test lung 2

Peep 0 Peep 5 Peep 10 Peep 15 Peep 200

200

400

600

800

1000

1200

1400

0 5 10 15 2021 26 30 35 405 9 14 19 29

1241

1052

653

353

186

Peep PIP Paw VTE

Conclusion

In pressure control as PEEP is increased pressure goes up and volume goes down.

In volume control as PEEP is increased pressure goes up.

~ PEEP will always increase pressure ~