ORL
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Investigation of time parameters
of acoustic reflex arc applying
innovative AEP and SMR
techniques
Piotr Świdziński, Prof.MD, PhD
Department of Phoniatrics and Audiology, Electrophysio-
logical Laboratory, Medical University, Poznań, Poland
Abstract
The authors present the comparison be­ order to have objective parameters to evaluate
tween results obtained in normal hearing brainstem lesions in demyelinating disease.
healthy subjects and patients with multiple Keywords: audiological examinations,
sclerosis. Electrophysiological measurements AEP (Auditory Evoked Potentials), SMR
(Auditory Evoked Potentials – AEP and Simple (Simple Motor Reaction time), SM (sclerosis
Motor Reaction time ­ SMR ) were performed in multiplex)
Rezumat
32 (16 ♀, 12 ♂) and 20 patients with cal Laboratory ( fig. 2) The program-
sclerosis multiplex (SM) having mer closes the passage between the sine
normal tonal audiogram and with- generator and the subject’s headphones
Autorii prezintă comparativ rezultatele
out paralytic symptoms. who hears in this moment the signal
obţinute la două loturi de subiecţi (cu
The SMR time evaluations were which is the stimulus to which the subject
auz normal, sănătoşi şi cu SM) evaluaţi
carried out using the apparatus must react by pressing the button of the
cu metode electrofiziologice (AEP şi
SMR), pentru a evidenţia prin metode
designed in the Electrophysiologi- key. The time intervals between the fol-
obiective modificările suferite la nive­
lul trunchiului cerebral în cadrul bolii
demielinizante.
Cuvinte-cheie: examinări audiologice,
potenţiale auditive evocate, timp de
reacţie motorie simplă, scleroză mul­
tiplă
In the investigations presented the
SMR (Simple Motor Reaction time)
and AEP (Auditory Evoked Potentials)
techniques were employed in evaluat-
ing time parameters of the acoustic
arc reflex. The connections between
the hearing pathway and the efferent
system may occur at different levels.
The SMR parameters can by divided
into three parts: afferent, association
and efferent ( fig.1 )
Materials and methods
The material comprises 28 healthy
subjects with normal hearing aged 21- Figure 1. Acoustic reflex arc - schema hearing pathway and simple motor reaction time
Nr. 2/februarie 2009
pag. 45
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