Changes of Brainstem Auditory Evoked Responses (BAERs) in a Brain Stem Ischemic Model Using Embolization Technique in Cats, a Preliminary Study

Muttaqin Zainal

Oki Shuichi

Arita Kazunori

Nakahara Toshinori

Tokuda Yoshio

Kohno Hiroaki

Emoto Katsuya

Kuwabara Satoshi

Uozumi Tohru

Hiroshima Journal of Medical Sciences

[PISSN] 0018-2052

[EISSN] 2433-7668

[NCID] AA00664312

In order to evaluate brain stem dysfunction related to ischemic process, the authors monitored the Brainstem Auditory Evoked Responses (BAERs) with time in a brain stem ischemic model.

19 adult mongrel cats were divided into two groups: embolization (n=14) and sham operated control (n=5). Embolization was done by injecting cylindrical silicone embolus to the right vertebral artery. Each successful embolization of the basilar artery was then confirmed by vertebral angiography. BAERs were monitored before embolization and then 5-10 min, 15 min, 30 min, 60 min, 3 hr and 6 hr after embolization. The presence of ischemic lesion caused by embolization was confirmed by injecting 2% Evans blue solution 30 min before sacrificing the animals. Leakage of the dye was observed.　　　

In embolized animals, significant (Student t test, p<0.05) delay of interpeak latencies of waves 1-3, 3-5, and 1-5 was observed 15 min after embolization. This delay became more significant (p<0.01) 30 min after embolization.　　　

These results provide evidence for the usefulness of BAERs monitoring which can be used to complement other diagnostic methods for patients with vertebrobasilar insufficiency and/or infarction.

Brain stem Auditory Evoked Responses

Brain stem ischemia

Embolization

Medical sciences [ 490 ]

eng

Hiroshima University Medical Press

[ISSN] 0018-2052

[NCID] AA00664312

[PMID] 2086559