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Background: Platelet-rich plasma is a frequently used plasma-derived material; however, a possible neoplastic or proliferative effect is one of the limiting issues in its use. The aim of our experimental study was to investigate the long-term histological effects of platelet-rich plasma on the middle ear mucosa. Methods: The rats were divided into 2 groups randomly (groups 1 and 2). Group 1 represented the control group and 8 rats were included in this group. To the left ear, 0.3 mL of normal saline solution was administered intra-tympanically. No injections were done to the right ears. Group 2 represented the platelet-rich plasma group and 11 rats were included. To the left ears, 0.3 mL of platelet-rich plasma and to the right ears 0.3 mL of normal saline solution was administered intra-tympanically. The intra-tympanic platelet-rich plasma injections were done twice with an interval of 1 week. All animals were sacrificed in the third month. The degree of mucosal thickness, the presence of metaplasia, atypical cells, myofibroblastic infiltration, angiogenesis, and acute or chronic inflammation were evaluated histopathologically. Results: Histopathological findings in the right and left ears in each group were compared in itself. The degree of inflammation and mucosal thickness were significantly higher in the perforated and saline administered side, in group 1 ( P < .001). In group 2, the degree of angiogenesis was significantly higher in the platelet-rich plasma administered side ( P < .001). The degree of mucosal thickness was significantly higher in the saline administered side ( P < .001). conclusion: Considering the anti-inflammatory and regenerative features and its safety, intra-tympanic-PRP may, in the future, be an alternative to current intra-tympanic treatment modalities.

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İnflamasyon temeline dayandırılan Bell paralizide NLR(nötrofillenfosit oranı), PLR(platelet-lenfosit oranı), MPV (ortalama platelet hacmi), RDW (kırmızı hücre dağılım genişliği) ve PDW (platelet dağılım genişliği) değerlerinin prognostik önemlerinin ve eğer varsa birbirlerine üstünlüklerinin olup olmadığının belirlenmesidir CONCLUSION: Inflammatory parameters are not independent prognostic factors in BP however according to the literature, some may be associated with microvascular damage and increased inflammation. There is a need to reveal the pathogenesis of the disease better with future studies and to investigate different parameters that can determine the prognosis