Heyer iTernIS ADV, Operator'S Manual

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Respiratory mechanics | iTernIS ADV
12. 8
12.5.2 |
Procedure
• PSV/CPAP
• SIMV (VCV) + PSV
• SIMV (PCV) + PSV
• MMV +PSV
• PSV + assured VT
• APRV
• NIV
• PRVC
[Respiratory Mechanics]>>Slow vital capacity. After implementing this string, the
test window appears on the screen. Pressing the rotary knob starts the measurement
maneuver slow vital capacity, which has a duration of 30 s.
As the patient performs successive breaths, the value obtained in each of them is
displayed on-screen, along with the maximum value obtained until the last measure-
ment (see Fig. 12-4).
During the implementation of the test, it is possible to cancel the maneuver by pres-
sing
[Esc].
Fig. 12-4 Slow vital capacity test. On the left side a Flow/
Volume loop is plotted, and on the right side the values
obtained in the test are displayed. In this case, with the last
breath, the full slow capacity has been achieved, so the
Current and Better values match.
The objective of this test is to help determine the ventilatory demand and the ca-
pacity of the patient to resume spontaneous ventilation. By definition, the P0.1
determines the pressure drop generated by the patient’s effort during the first 100
ms after the last known pressure threshold is below the base pressure.
P0.1 determination does not require patient cooperation, and the patient must not
be notified of the time the test starts. This test is only enabled for the ADL and PED
patient categories.
At the start of the maneuver, the ventilator analyzes the breathing cycle during two
breaths, identifying inspiration and expiration. During the last expiration, inspiratory
occlusion of the inspiratory valve occurs, and the expiratory valve is left open.
12.4.3 | Implementation
12.5 | P0.1
12.5.1 | Concepts