Page 428 - Clinical Application of Mechanical Ventilation

394 Chapter 12

cm H 2 O
A
6
5
4
3
2
1
0 End-Expiratory Pressure (EEP)
DP = 2 cm H 2 O 21
22 Sensitivity Setting
(2 cm H 2 O below EEP)
23

cm H 2 O
B
6 Auto-PEEP
5
4
3 6
DP = 8 cm H 2 O 2
1
0 End-Expiratory Pressure (EEP)
21 2
22 Sensitivity Setting
(2 cm H 2 O below EEP)
23

cm H 2 O
C
6 Auto-PEEP
1
5 Therapeutic PEEP
DP = 3 cm H 2 O
4 2
3 Sensitivity
2 (2 cm H 2 O below PEEP)
1
0
21
22 © Cengage Learning 2014
23

Figure 12-2 (A) Without auto-PEEP, the pressure gradient (DP) from end-expiratory pressure
to sensitivity setting is 2 cm H 2 O. (B) With auto-PEEP of 6 cm H 2 O, the DP from auto-PEEP to sen-
sitivity setting is 8 cm H 2 O. (C) With auto-PEEP of 6 cm H 2 O and therapeutic PEEP setting of 5 cm
H 2 O, the DP from auto-PEEP to sensitivity setting is 3 cm H 2 O.

CARE OF THE VENTILATOR CIRCUIT

The ventilator circuit serves as an important interface between the ventilator and
the patient. Circuit compliance, circuit patency, humidity, and temperature are
four essential factors in the management of mechanical ventilation.

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