Heyer iTernIS ADV, Operator'S Manual

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Respiratory mechanics | iTernIS ADV
12. 12
of the inspiratory valve occurs during 20 s, and the expiratory valve is left open.
This allows free expiration, but during the inspiration, the patient demands air in an
enclosed system. This causes the pressure inside the patient circuit to decrease as
the magnitude of the patient’s effort increases.
La Pimax is calculated as the greatest drop in airway pressure that occurs during
the occlusion period. The result is stated as an absolute value, taken as a referen-
ce at the base pressure level.
Test enabled in the following modes:
• PSV/CPAP
• SIMV (VCV) + PSV
• SIMV (PCV) + PSV
• MMV +PSV
• PSV + assured VT
• APRV
• NIV
[Respiratory Mechanics]>>Pimax. After implementing this string, the test window
appears on the screen. Pressing the rotary knob starts the maneuver that performs
the measurements of maximal inspiratory pressure during 20 s. At this time all ins-
piratory efforts are monitored, and in the numerical data window, the highest value
obtained in the series of efforts is recorded. Once the test concludes, it is possible
repeat it.
If the patient is cooperative, he/she can be encouraged to achieve maximum inspi-
ratory effort. If the patient is not cooperative, the most negative pressure achieved
is taken as valid.
After the maneuver, the breathing returns to the original operative mode and the
screen freezes showing the value obtained.
During the implementation of the test, it is possible to cancel the maneuver by
pressing
[Esc].
Fig. 12-7
Detail of the Pimax test screen.
12.7.3 |
Implementation