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The effects of cochleostomy of hearing threshold in animal experiment

100%

Stanisławek-Sut O., Morawski K., Niemczyk K.

Otolaryngologia Polska

2010

vol. 64(7)

17-21

SUMMARY Introduction: To assess an effect of cochleostomy on hearing threshold in guinea pigs. Material and methods: The authors performed animal experiments using fi ve 3-month-old guinea pigs. Before experiment hearing threshold were evaluated. Surgery involved access to the temporal bone by a post-auricular incision. After a wide opening of the bulla cochleostomy was created (10 000 turn/min, diamond bur of 0,8 mm diameter). Hearing threshold was identifi ed on the basis of presence of wave V in auditory brainstem responses (ABR) for click and frequency-specifi c stimulation. Also morphology and latency changes for wave V for this stimulation was assesed. Hearing status was evaluated before, just after and 1-, 2-, and 4-weeks after surgery. For surgical procedure and ABR examination all animals were anesthetized with an intramuscular injection of ketamine (50 mg/kg) mixed with xylazine (9 mg/kg) in the supplemental doses. After surgery the animal was treated by antibioticoterapy for 3 days – Enrofl oksacyna 0,3 ml subcutaneouly and analgesic – Tolfedine 0,05 mg in second day. Results: Four week observation of ABR morphology and hearing thresholds for click and frequency-specifi c stimulation of 100 dB SPL intensity showed only temporary changes confi rming that cochleostomy did not affect cochlear function. Conclusions: The correctly performed cochleostomy in guinea pigs did not affect persistently the cochlear function indicating that such an option of CI electrode insertion in patients is safe.

Evaluation of the implant electrode inside the cochlea and damage to cochlear structures associated with implantation using cone beam computed tomography techniques (CBCT)

88%

Orłowski A., Lachowska M., Wiśniewska E., Niemczyk G., Koszel-Orłowska A., Szopiński K., Niemczyk K.

Polski Przegląd Otorynolaryngologiczny

2016

vol. 5(1)

1-10

Objectives: The aim was to evaluate the position of the cochlear implant electrode inside the cochlea and damage to cochlear structures associated with the implantation itself using cone beam computed tomography technique (CBCT). Material and methods: Nine human cadaver temporal bones were used, five were implanted with round window approach and in other four anterior cochleostomy was used for insertion. After implantation the temporal boneswere scanned with CBCT scanner and the images were then analyzed. The degree of insertion damage was evaluated in two-tier scale, where the first degree included damage to basilar membrane, and the second degree covered damage associated with pushing up into the scala vestibuli. Results: The first degree of cochlear damage was noted in three temporal bones implanted with the round window approach and in two with cochleostomy, and the second degree of damage was noted in two and one temporal bones respectively. The analysis did not show any correlations between depth of insertion and degree and extend of damage in both analyzed groups, also no significant differences were found between the two groups. Conclusions: The good quality of the images presents CBCT as a good method for the evaluation of the cochlear implant electrode position in the inner ear structures. CBCT holds the promise for intraoperative imagining during cochlear implantation.

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1 Otolaryngologia Polska

1 Polski Przegląd Otorynolaryngologiczny

1 2018

1 2016

2 Niemczyk K.

1 Koszel-Orłowska A.

1 Lachowska M.

1 Morawski K.

1 Niemczyk G.

1 Orłowski A.

1 Stanisławek-Sut O.

1 Szopiński K.

1 Wiśniewska E.

Search results

The effects of cochleostomy of hearing threshold in animal experiment

Evaluation of the implant electrode inside the cochlea and damage to cochlear structures associated with implantation using cone beam computed tomography techniques (CBCT)