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  • Title: Effect of absorbable gelatin sponge in the middle ear: in vitro and in vivo animal model.
    Author: Goncalves S, Chiossone-Kerdel JA, Bianco AS, Ercolino JM, Hernandez-Rojas J.
    Journal: Acta Otolaryngol; 2015 Jan; 135(1):14-25. PubMed ID: 25496177.
    Abstract:
    CONCLUSION: GelitaSpon gelatin sponge (GS) showed faster reabsorption than gelfoam (GF) in vitro, and GS-packed middle ears resulted in a faster hearing recovery and less inflammation than the ears packed with GF soaked in saline. Soaking GF sponges with boric acid (BA) appeared to offset the inflammatory response of saline-soaked GF, making this inflammatory response comparable to that of GS-packed ears. OBJECTIVE: To describe the reabsorption and inflammatory effects of absorbable gelatin sponge in the middle ear. METHODS: For in vitro evaluation, GF and GS were used as disks immersed in saline solution or 3% BA and placed in gel. Images were captured with a microscope and processed using image processing Toolbox. For in vivo tests, 16 female albino Sprague Dawley rats were divided into four groups: bulla opening; GF + 0.9% saline; GF + BA; and GS + 0.9% saline. An anterior approach to the right bulla was used for surgery. Preoperative and postoperative auditory brainstem response thresholds were measured. RESULTS: In vitro, there was marked degradation of GF by day 14, while GS showed complete degradation by the third day. In vivo, hearing recovery occurred by day 21. GF produced a more severe inflammatory response, which could be reduced by treating the GF with BA.
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