Otodynamics DP Clinical, Руководство пользователя

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CHAPTER TEN
ABR test
96
ABR test procedure
Poor Probe Fit The last stimulus level recorded changed from
that recorded at the start of the test by >3dB, or the
last acoustic noise level recorded was high.
Stopped Too Soon The test has been ended manually before the
minimum amount of data required had been
collected.
Atypical Waveform The template correlation (TC) is low but Fsp is high.
A possible ABR has been detected but it did not
match the neonate template. This might occur if an
adult were tested or if electrodes were incorrectly
connected or reversed. (Only obtained with
pass criteria PC2 and PC3).
High Mains Noise Interference from electrical equipment prevented
the test from passing. The Fsp pass threshold was
elevated due to this interference and the Fsp did
not reach this higher threshold.
High Impedance The electrode impedances measured at the end
of the test were high and may have prevented an
ABR from being recorded. This could be caused
by electrodes becoming disconnected from the
patient during testing.
High EEG Noise Electrical noise during the test prevented an ABR
from being recorded. This occurs when the
noise recorded is too high (above 40nV) at the end
of the test. This is most likely caused by the baby
being unsettled during the test (myogenic
interference).
After the test end, ABR test results are saved.