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. 2006 Nov-Dec;72(6):794-9.
doi: 10.1016/s1808-8694(15)31046-6.

Tympanic membrane healing in myringotomies performed with argon laser or microknife: an experimental study in rats

Lucio Almeida Castagno  1 , Luiz Lavinksy
Affiliations

Tympanic membrane healing in myringotomies performed with argon laser or microknife: an experimental study in rats

Lucio Almeida Castagno et al. Braz J Otorhinolaryngol. 2006 Nov-Dec.

Abstract

Secretory otitis media (SOM) and recurrent acute otitis media (RAOM) may require surgical treatment to proper ventilate the middle ear. Incisional myringotomy is usually done under microscopy with a micro-knife, but it remains patent for just a few days. Recent research indicates that laser assisted myringotomies remain open much longer, allowing middle ear ventilation and healing.

Material and methods: In this experimental study 34 white, male, adult, Wistar rats, without middle ear disease were submitted to anesthesia with ketamine 27 mg/kg and xylazine 2,7 mg/kg. Incisional myringotomy was done on the right ear, while laser myringotomy was done on the left. Myringotomies were evaluated periodically until healing.

Results: The healing times were equivalent. All myringotomies healed within 10 days.

Conclusion: Argon laser assisted myringotomy healed just as early on as incisional myringotomy on Wistar rats without middle ear diseases.

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Figures

Figure 1
Figure 1
Wistar rat tympanic membrane anatomy compared to the human ear drum.
Figure 2ª
Figure 2ª
Radial tympanocentesis by microknife (left), and circular by argon laser (right).
Figure 2b
Figure 2b
Triangular tympanocentesis by microknife (left), and oval by argon laser (right).
Figure 2c
Figure 2c
Broad tympanocentesis (left), and irregular by argon laser (right).
See this image and copyright information in PMC

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