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Erschienen in: European Archives of Oto-Rhino-Laryngology 7/2019

06.04.2019 | Otology

Protective and therapeutic effects of milrinone on acoustic trauma in rat cochlea

verfasst von: Seyit Mehmet Ceylan, Erdal Uysal, Serdar Altinay, Efe Sezgin, Nagihan Bilal, Emine Petekkaya, Mehmet Dokur, Mahmut Alper Kanmaz, Mustafa Emre Gulbagci

Erschienen in: European Archives of Oto-Rhino-Laryngology | Ausgabe 7/2019

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Abstract

Objective

The aim of this study was to investigate the potential protective and therapeutic effects of milrinone, a specific phosphodiesterase (PDE) III inhibitor, on acoustic trauma-induced cochlear injury and apoptosis.

Methods

A total number of 30 healthy Wistar albino rats were evenly divided into five groups as follows: group 1 was assigned as control group; group 2 and 3 were assigned as low-dosage groups (0.25 mg/kg) in which milrinone was administered 1 h before acoustic trauma (AT) and 2 h after AT, respectively; group 4 and 5 were assigned as high-dosage groups (0.50 mg/kg) in which the drug was administered 1 h before AT and 2 h after AT, respectively. Except control group, all treatment groups received a single dosage of milrinone for 5 days. Distortion product otoacoustic emissions (DPOAE) measurements were recorded before AT as well as at second and fifth post-traumatic days. At the end of fifth day, all rats were sacrificed and the cochlea of the rats was removed for histopathological evaluation. In addition, the groups were compared in terms of apoptotic index via caspase-3 staining.

Results

In terms of signal-to-noise ratio (SNR), there was no statistically significant difference among the groups following AT (p > 0.05). After 5 days of milrinone treatment, the best SNR values were found in group 5, though all groups did not statistically differ (p > 0.05). In histopathological evaluation, vacuolization, inflammation, and edema scores in all treatment groups were statistically lower than those of the control group (p < 0.05). In group 2 and 4 where the drug was administered before AT, the inflammation and apoptosis index was lower than those of group 3 and 5 where the drug was administered after AT (p < 0.0001).

Conclusion

We reveal that milrinone has a protective effect on cochlear damage in the experimental acoustic model of rats. This protective effect was more apparent following the pre-traumatic milrinone administration, and is associated with its effect on decreasing inflammation and apoptosis. Based on DPOAE measurements following AT, especially in the group 5 (high-dosage group), milrinone may also have a therapeutic effect.
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Metadaten
Titel
Protective and therapeutic effects of milrinone on acoustic trauma in rat cochlea
verfasst von
Seyit Mehmet Ceylan
Erdal Uysal
Serdar Altinay
Efe Sezgin
Nagihan Bilal
Emine Petekkaya
Mehmet Dokur
Mahmut Alper Kanmaz
Mustafa Emre Gulbagci
Publikationsdatum
06.04.2019
Verlag
Springer Berlin Heidelberg
Erschienen in
European Archives of Oto-Rhino-Laryngology / Ausgabe 7/2019
Print ISSN: 0937-4477
Elektronische ISSN: 1434-4726
DOI
https://doi.org/10.1007/s00405-019-05417-5

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Bilateraler Hörsturz hat eine schlechte Prognose

15.04.2024 Hörsturz Nachrichten

Die Mehrzahl der Menschen mit Hörsturz ist einseitig betroffen, doch auch ein beidseitiger Hörsturz ist möglich. Wie häufig solche Fälle sind und wie sich ihr Verlauf darstellt, hat eine HNO-Expertenrunde aus den USA untersucht.

Update HNO

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