EvitaXL

Negative Inspiratory Force NIF
The Negative Inspiratory Force index
(NIF)* measures the patient's maximum
inhalation effort after exhaling. The
patient system is closed during measurement
of the NIF. This value is also known
as the Maximum Inspiratory Pressure
(MIP). As a result of the inhalation effort
during manually extended expiration, the
patient generates a negative pressure in
relation to PEEP.
The probability that the patient can be
weaned successfully increases with the
magnitude of this negative pressure.
Patients with a NIF of less than
–30 mbar can in all probability be extubated
successfully, while those with a
NIF of up to –20 mbar will most probably
prove unsuccessful.
EvitaXL determines the NIF value during
manually extended expiration.
● Touch the function key »Special Procedure...«.
EvitaXL displays the menu
»Additional Function«.
● Touch the screen key »Diagnostics«.
● Touch the screen key »NIF«.
EvitaXL displays the last measured NIF
value in larger characters with time/date
in the left-hand column. The value for the
previous measurement is in the righthand
column.
To measure the NIF value:
● Touch and hold the screen key »Exp.
Hold« for the required expiration
time. Expiration is ended by the ventilator
after max. 15 seconds.
Measurement is ended automatically by
EvitaXL after max. 15 seconds.
To view additional text information:
● Touch the screen key »? q «.
To quit the menu:
● Touch the screen key »x«.
* For a detailed description of NIF, see
page 225.
Bibliography [17], [18], page 235
Diagnostic functions
Negative Inspiratory Force NIF
Instructions for Use EvitaXL 101
137