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Ultrasonographic findings of facial muscles in patients with severe facial palsy who showed no improvement for more than 3 months on acute stage

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A Letter to the Editor to this article was published on 23 February 2024

Abstract

Introduction/Aims

The study aimed to visualize the changes in the facial muscles of patients with severe facial palsy who showed no improvement for more than 3 months on acute stage.

Methods

The 102 patients with severe facial palsy over House-Brackmann grade IV or an 80% degenerative ratio on ENoG at the initial examination, who showed no improvement for more than 3 months on acute stage were indicated to undergo ultrasonography of the face to evaluate the facial muscles.

Results

Muscular degeneration was observed in 537/918 muscles (58.5%). Muscle volume shrinkage was observed in 209/918 muscles (22.8%). Fascial adhesions were observed in 209/918 muscles (22.7%).

Among all the muscles assessed for degenerative changes, zygomaticus major/minor was the most affected by degenerative changes (91.2%). Degenerative changes were observed in the levator labii superioris muscle in 84.3% patients.

The shrinkage was most frequently observed in the zygomaticus major muscle (61/102 patients [59.8%]), followed by the zygomaticus minor muscle (43.1%). Shrinkage of the levator labii suprioris was observed in 24.5% patients. The zygomaticus major/minor muscle had the highest proportion of fascial adhesions in 61.8% and 66.7% patients respectively. The levator labii suprioris muscle showed the lowest proportion of fascial adhesions, with only 7.8% patients being affected.

Discussion

This study confirmed that the zygomaticus major, zygomaticus minor, and levator labii suprioris muscles, which raise the corner of the mouth, are the first to degenerate in patients with severe facial paralysis. This study demonstrated that ultrasonography is a simple and non-invasive examination for facial paralysis.

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Authors and Affiliations

  1. Department of Otorhinolaryngology, Dong-Tan Sacred Heart Hospital, Hallym University College of Medicine, 7 Keunjaebong-gil, Dongtan 1(il)-dong, Hwaseong-si, Gyeonggi-do, 445-907, South Korea

    Ji Hae Lee, Il-Seok Park & ** Kim

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  1. Ji Hae Lee
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  2. Il-Seok Park
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Correspondence to ** Kim.

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The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institution or practice at which the studies were conducted [The Hallym University Dong-Tan Sacred Heart Hospital institutional review board approved this retroprospective study, IRB number:2023–01-013].

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Lee, J.H., Park, IS. & Kim, J. Ultrasonographic findings of facial muscles in patients with severe facial palsy who showed no improvement for more than 3 months on acute stage. Eur Arch Otorhinolaryngol 281, 2001–2010 (2024). https://doi.org/10.1007/s00405-023-08426-7

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  • DOI: https://doi.org/10.1007/s00405-023-08426-7

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