Effects of Apixaban, Rivaroxaban, Dabigatran and Enoxaparin on Histopathology and Laboratory Parameters in Achilles Tendon Injury: An in vivo Study.

OBJECTIVES: To compare the effects of apixaban, rivaroxaban, dabigatran and enoxaparin on histopathology and blood parameters in rats with Achilles tendon injury. MATERIALS AND METHODS: Thirty adult, male Wistar albino rats weighting 220-240 g were randomly divided into five (one control and four treatment) groups and placed in a controlled environment. The Achilles tendon was incised and re-sutured in each rat, after which each group was provided the following treatment for 28 days: a) 2 ml saline to the control group, b) apixaban in 1 ml of saline (10 mg/kg/day) +1 ml of saline, c) rivaroxaban in 1 ml of saline (2 mg/kg/day) +1 ml saline, d) dabigatran in 1 ml of saline (30 mg/kg/day) +1 ml of saline, e) enoxaparin (80 µg/kg/day) + 2 ml of saline. RESULTS: Hemogram, biochemical and coagulation parameters differed significantly between the control and treatment groups (P < 0.05). Compared with the control group, in the apixaban group, type I and type III collagen immunoreactivity were severe and moderate, respectively. In the rivaroxaban and dabigatran groups, both type I and type III collagen immunoreactivity were medium and severe, respectively. In the enoxaparin group, type I and type III collagen immunoreactivity were mild and severe, respectively. CONCLUSION: The higher concentration of type I collagen in the apixaban and dabigatran indicates faster tendon healing in these groups, and the higher concentration of the type III collagen in the enoxaparin group indicates slower healing in this group.

The Effect of 3D-Printed Custom External Nasal Splint on Edema and Ecchymosis After Rhinoplasty.

PURPOSE: The aim of this study was to investigate the effects of traditional thermoplastic splints vs a 3D-printed custom external nasal splint designed to apply pressure to the lateral osteotomy lines and neighboring periorbital region on edema and ecchymosis after rhinoplasty. PATIENTS AND METHODS: Forty patients undergoing open rhinoplasty were included in this prospective randomized controlled study. The patients were divided into 2 groups. In the study group, the new 3D-printed custom external nasal splint was used. In the control group, the thermoplastic external nasal splint was used. Periorbital edema and ecchymosis scores were assessed peroperative before external nasal splint application, postoperatively at the 1st and 4th hours, and 1st, 2nd, 5th, 7th, 10th, and 15th days. RESULTS: There were lower scores of ecchymosis and edema in the study group compared to the control group for all the follow-up controls. There was a significant difference between the 2 groups with respect to the occurrence of ecchymosis for all follow-up controls except for the first postoperative hour and the seventh postoperative day (P < .05). Comparison of the 2 groups with respect to the grade of edema showed a significant difference only in the first and fourth postoperative hours (P < .05). CONCLUSIONS: The study detected less edema and ecchymosis scores using this 3D custom external nasal splint, thus creating a new area of use for 3D printers in the field of facial esthetic surgery. New thermoplastic splints of different shapes and sizes can be produced that can compress the osteotomy lines and the neighboring periorbital region.

The effects of aminoguanidine, methylprednisolone, and melatonin on nerve recovery in peripheral facial nerve neurorrhaphy.

BACKGROUND: The medications may enhance the recovery after nerve paralysis. We aimed to evaluate the effects of aminoguanidine (AG), melatonin, and methylprednisolone on peripheral facial nerve neurorrhaphy. METHODS: The buccal branch of the facial nerve was transected and autografted in 32 New Zealand rabbits. Subjects were divided into 4 groups equally (AG, melatonin, methylprednisolone, and control). After the medical treatment latency and amplitude were measured with nerve conduction study at 3, 6, and 10 weeks. Then, coapted segments of nerve were examined microscopically. The groups were compared with each other. RESULTS: The latent period was shortened, and the amplitudes were increased in the AG group; the latent period was shortened, and the amplitudes did not show significant change in the melatonin group with the time. There were no significant differences between the amplitudes at 3 to 6 and 3 to 10 weeks in the methylprednisolone group, and the latent period was shortened. There was no significant difference between the amplitude values at 3, 6, and 10 weeks in the control group. In the histological examination, AG had the best influence on preventing myelin degeneration and reducing the accumulation of myelin debris. Considering the increase in collagen fibers, the best results were achieved in the melatonin group. The degree of myelin-axonal degeneration was higher in the methylprednisolone group. The degree of collagen fiber increase, axonal degeneration, myelin degeneration, and the accumulation of myelin debris were detected quite high in the control group. CONCLUSIONS: Aminoguanidine and melatonin alone achieved an increase in regeneration after peripheral facial nerve neurorrhaphy, but methylprednisolone did not. The best healing was determined in the AG group.

Effect of pregabalin and dexamethasone on postoperative analgesia after septoplasty.

Objectives. The aim of this study was to explore effect of a combination of pregabalin and dexamethasone on pain control after septoplasty operations. Methods. In this study, 90 patients who were scheduled for septoplasty under general anesthesia were randomly assigned into groups that received either placebo (Group C), pregabalin (Group P), or pregabalin and dexamethasone (Group PD). Preoperatively, patients received either pregabalin 300 mg one hour before surgery, dexamethasone 8 mg intravenously during induction, or placebo according to their allocation. Postoperative pain treatment included tramadol and diclofenac sodium 30 minutes before the end of the operation. Numeric rating scale (NRS) for pain assessment, side effects, and consumption of tramadol, pethidine, and ondansetron were recorded. Results. The median NRS score at the postoperative 0 and the 2nd h was significantly higher in Group C than in Group P and Group PD (P ≤ 0.004 for both). The 24 h tramadol and pethidine, consumptions were significantly reduced in Groups P and PD compared to Group C (P < 0.001 and P < 0.001). The incidence of blurred vision was significantly higher in Group PD compared to Group C within both 0-2 h and 0-24 h periods (P = 0.002 and P < 0.001, resp.). Conclusions. We conclude that administration of 300 mg pregabalin preoperatively may be an adequate choice for pain control after septoplasty. Addition of dexamethasone does not significantly reduce pain in these patients.

Comparison of topical tramadol and ketamine in pain treatment after tonsillectomy.

OBJECTIVES/AIM: The primary objective of this study is to evaluate the effects of topically applied ketamine or tramadol on early postoperative pain scores in children undergoing tonsillectomy. The secondary aim of the study is to assess nausea, vomiting, difficulty in swallowing, and sore throat characteristics of the patients. BACKGROUND: Tonsillectomy surgery is frequently associated with postoperative pain, which usually requires substantial consumption of analgesics including opioids. Safe and effective post-tonsillectomy pain control is still a clinical dilemma, in spite of the use of various surgical and anesthetic techniques. METHODS: A total of 60 children, aged between 4 and 10 years, scheduled for tonsillectomy, were randomly assigned to one of three groups. Study drugs were administered to both tonsillar fossae for 5 min. In 5 ml artificial saliva, Group K (n = 20) received 0.4 ml (20 mg) ketamine and Group T (n = 20) received 0.8 ml tramadol HCl solution. Group C (n = 20) received only 5 ml saline as a control. Ramsay Sedation Scale and FACES PRS Score, nausea, vomiting, difficulty in swallowing, and sore throat were evaluated. RESULTS: There was no difference among the groups in terms of baseline characteristics, including age, sex, and ASA profile (P > 0.05 for all). Systolic blood pressure, diastolic blood pressure, mean blood pressure, heart rate, respiratory rate, and saturation of peripheral oxygen (SpO2 ) values were not significantly different among the groups in all time points (P > 0.05 for all). There was a statistically significant difference among the groups according to Ramsay Sedation Scales in 40th minute (P < 0.001). There were statistically significant differences among the groups in terms of Wong-Baker FACES Pain Rating Scale Score in all time points (P < 0.004 for all). There was a statistically significant difference among the groups in terms of rescue analgesia necessity in 5th and 10th minute (P < 0.001 and P = 0.003). There was a statistically significant difference among the groups in terms of sore throat in 5th and 10th minute (P < 0.001 for both). Neither rescue analgesia necessity nor sore throat characteristics was different between the Group T and Group K in all time points. CONCLUSION: Topical tramadol and ketamine seem to be safe, effective, and easy analgesic approach for decreasing tonsillectomy pain.

Histopathological evaluation of the effect of intranasal phototherapy on nasal mucosa in rabbits.

Allergic rhinitis is a high-incidence allergic inflammation of the nasal airways that impacts quality of life. Of the numerous therapies used to treat allergic rhinitis, intranasal phototherapy has emerged as a promising new treatment modality for inflammatory airway disease. Phototherapy is widely used for the treatment of immune-mediated skin diseases because its profound immunosuppressive effect inhibits hypersensitivity reactions in the skin. Intranasal phototherapy using a combination of Ultraviolet-A (UVA) and Ultraviolet-B (UVB) plus Visible light (VIS) has been shown to suppress the clinical symptoms of allergic rhinitis, but limited data regarding its adverse effects on the nasal mucosa currently exists. In this study, we demonstrate that UV displays no harmful effects on the nasal mucosa cells of rabbits following 2 weeks of intranasal phototherapy.

MRI findings of papillary cystadenocarcinoma of the submandibular gland.

Papillary cystadenocarcinoma is an extremely rare malignant tumor of the salivary glands. Major locations of this neoplasm are the parotid gland, sublingual gland, and minor salivary glands, while occurrence in the submandibular gland is extremely rare. Magnetic resonance imaging (MRI) findings of this lesion have not been reported in the literature. Herein, we present a case of papillary cystadenocarcinoma arising from the right submandibular gland. MRI showed a 5-cm mass composed of solid and cystic components in the mildly enlarged gland. Pathologic evaluation revealed papillary cystadenocarcinoma.

Comparisons of steroid, acyclovir, lipoprostoglandin E1 and steroid + acyclovir treatments in facial paralysis: a rat study.

OBJECTIVE: To induce experimental peripheral facial paralysis by inoculation of HSV1 and to compare the effects of steroid, acyclovir, lipoprostoglandin E2 and steroid + acyclovir treatments in terms of clinical recovery, electrophysiologically and histopathologically. MATERIALS AND METHODS: A total of 132 adult female rats were used in this study. HSV type 1 strain was inoculated at the back of the left ear by using 27 gauge needle. Of all animals, 70 (53%) rats which developed facial paralysis were divided into five groups (n = 14 for each group) as control, steroid + acyclovir, lipoprostaglandin E1, steroid only and acyclovir only. At the end of the 21 days period, the rats were clinically examined and electrophysiological tests were performed, then decapitated and the nerve specimens were obtained. RESULTS: A modified electroneurography (ENoG) test was performed and the latencies and the amplitudes were compared. The findings of the intact side were better, but with no significant difference. Histopathologicaly edema was significantly smaller in all groups compared to the controls (p < 0.05). Similarly, no difference was seen in terms of vacuolar degeneration and Schwann cell hyperchromatisation among the groups and no significant difference in recovery period and rate of facial paralysis when all groups were compared. CONCLUSION: Facial paralysis induced by HSV1 recovered spontaneously within a week. In the treatment of facial paralysis, steroid alone, acyclovir alone, steroid + acyclovir, or lipoprostaglandin E1 all reduced edema in the infected facial nerve but there was no statistical difference in of the rate or degree of recovery.

High-frequency hearing loss and middle ear involvement in rheumatoid arthritis.

PURPOSE: We aimed to evaluate the possible changes in the middle ears of patients with rheumatoid arthritis (RA) and to measure their hearing functions by eleven different test frequencies including standard and high frequencies. MATERIALS AND METHODS: The study group was comprised of 74 patients with RA. The control group was comprised of 45 healthy subjects. We performed speech test, tympanometry, acoustic reflex test, and standard and high-frequency pure tone audiometric tests in the study and the control groups. RESULTS: It was observed that significant increases in the thresholds of pure tones in all test frequencies for the study group versus the controls (P <.0001). In terms of the duration of the disease, hearing loss of the patients with disease duration of 1 to 5 years was higher than that of the controls and exceeded beyond the level of 20 dB especially in high frequencies starting from 10,000 Hz. In patients with disease duration of 6 to 10 years, the beginning point for hearing loss was 4,000 Hz. The patients with disease duration of 11 to 15 years and of above 16 years had high hearing thresholds in all frequencies. We found normal pressure in the middle ears of the study and the control groups. CONCLUSION: Sensorineural type hearing loss developed in patients with RA especially in high frequencies. We also determined a diminished compliance in the middle ears of those patients, but this was not in a level of a conducting type hearing loss.

Comparative analysis of serum homocysteine, folic acid and Vitamin B12 levels in patients with noise-induced hearing loss.

OBJECTIVE: The aim of the present study was to determine the levels of homocysteine, folic acid, and Vitamin B12 in subjects with noise-induced hearing loss. Furthermore, possible links between these parameters and noise-induced hearing loss were aimed to be evaluated. METHODS: In the present study, blood samples were obtained from all subjects after overnight fasting for biochemical analysis. We examined the levels of homocysteine, Vitamin B12 and folic acid levels in subjects with noise-induced hearing loss. Twenty-eight male patients with noise-induced hearing loss (mean age 37 +/- 5 year) were included in the study group whereas the control group was composed of 32 healthy male volunteers (mean age 36 +/- 4 year). RESULTS: It was found that homocysteine levels of subjects with noise-induced hearing loss as significantly high compared to healthy controls (P < 0.05). On the other hand, Vitamin B12 and folic acid levels of patients with noise-induced hearing loss were determined to be significantly low compared to the controls (P < 0.05 and < 0.01, respectively). CONCLUSION: Our findings indicate that there might be a link between increased homocysteine levels and noise-induced hearing loss. Since increased homocysteine levels cause elevated levels of free radicals in addition to its atherogenic and thrombogenic effects. Further experimental studies are needed to decipher how this relationship is linked.

The relationship between preoperative serum immunoglobulin levels and the development of bacteremia after tonsillectomy.

OBJECTIVES: We examined the risk for the development of bacteremia during tonsillectomy and evaluated the presence of an association between bacteremia and preoperative serum immunoglobulin levels. PATIENTS AND METHODS: The study included 40 patients (16 males, 24 females; mean age 16.8 years; range 5 to 35 years) who underwent tonsillectomy with the use of the dissection-snear technique. Preoperatively, venous blood samples were collected from all the patients to determine serum immunoglobulin levels and the presence or absence of bacteremia. Bacteremia was also investigated in blood samples postoperatively. RESULTS: There was no growth in the preoperative blood cultures, but bacteremia was documented in 10 patients (25%) after tonsillectomy. Increased serum IgG levels were determined in 15 patients before operation, seven of whom developed bacteremia after tonsillectomy (p<0.05). There was no correlation between postoperative bacteremia and preoperative serum IgM or IgA levels (p>0.05). CONCLUSION: Although our current knowledge does not allow to predict bacteremia following tonsillectomy in advance, the finding that seven of 10 patients who developed bacteremia had increased preoperative IgG levels draws attention to serum IgG, especially in patents in whom bacteremia may present additional risks.

[The levels of vitamins A, E, B12 and folic acid in noise-induced hearing loss]. / Gürültüye bagli isitme kayipli hastalarda vitamin A, E, B12 ve folik asit düzeyleri.

OBJECTIVES: To investigate the levels of vitamin A, E, B12, folic acid in employees with hearing loss due to noise. PATIENTS AND METHODS: Employees in a local hydroelectric powerhouse who suffered from hearing loss due to noise were included in the study. Study and control groups were composed of 28 employees (mean age 37+/-5 years) and 30 voluntary subjects (mean age 36+/-4 years), respectively. All the subjects in patient and control groups were males. Blood samples were obtained from all subjects and vitamin A, E, B12 and folic acid levels were measured. RESULTS: Level of vitamin B12 was found low in the patient group and normal in the control group and these were found statistically significant (p<0.005). There were no significant differences between vitamin A, E and folic acid levels. CONCLUSION: We think that measurement of vitamin B12 in routine control of the people who are working in noisy environment may be useful.

[Findings of standard and high-frequency audiometry in workers exposed to occupational noise for long durations]. / Uzun süre mesleki gürültüye maruz kalan isçilerde standart ve yüksek frekans odyometri bulgulari.

OBJECTIVES: Changes in hearing thresholds were determined by standard and high-frequency audiometry in subjects exposed to occupational noise for long durations. PATIENTS AND METHODS: Hearing thresholds were measured between 250 and 16000 Hz frequencies by standard and high-frequency audiometry in 64 male workers (mean age 42 years; range 31 to 55 years) of a hydroelectric power plant and in 30 age- and sex-matched controls with no hearing problems. The workers were divided into three groups according to the noise level and into four groups according to the duration of exposure. RESULTS: The mean hearing thresholds of workers showed significant increases in all frequencies from 4000 to 16000 Hz (p<0.005), the most affected frequencies being 4000, 6000, 14000, and 16000 Hz (p<0.0005). Increases in hearing thresholds were significantly correlated with the noise level and duration of exposure to noise (p<0.05). CONCLUSION: The results suggest that high-frequency audiometry should be used together with standard audiometry in the detection and follow-up of individuals who are at potential risks for hearing losses.

[The effect of vitamin E on histopathologic healing and lipid peroxidation levels in experimentally induced traumatic tympanic membrane perforations]. / Travmatik timpanik membran perforasyonlarinda E vitamininin histopatolojik iyilesme ve lipid peroksidasyon düzeyleri üzerine etkileri: Deneysel çalisma.

OBJECTIVES: To examine the favorable effects of vitamin E on tympanic membrane perforations induced mechanically in guinea pigs. STUDY DESIGN: Bilateral tympanic membrane perforations of 1.8 mm were induced in 40 guinea pigs. The animals were randomly divided into two groups equal in number. One group remained untreated, while the other was administered vitamin E (100 mg/kg/day) through intramuscular injections. On days 1, 3, 5, and 7, five animals in each group were randomly sacrificed. Histopathologic changes in the tympanic membranes were evaluated and malondialdehyde levels were determined. RESULTS: Significant increases were observed in epithelial thickness, fibroblastic proliferation, and neovascularization in the study group (p<0.05). Epithelial thickness was found to be increased in both groups beginning from the first day; however, this increase was more rapid in the study group. Although malondialdehyde levels showed significant increases on days 3 and 5 in both groups (p<0.05), they returned to the first day values in vitamin E-treated animals on day 7, whereas controls still maintained high malondialdehyde levels. CONCLUSION: Vitamin E hastens the healing process of traumatic tympanic membrane perforations.

Ectopic thyroid and Hashimoto's thyroiditis arising from a thyroglossal duct cyst: a case report.

A seventy-five-year-old male patient presented with a palpable smooth mass that moved upwards on swallowing, extending from the hyoid bone to the cricoid cartilage. Ultrasonography, scintigraphy, and thyroid hormone measurements showed the mass free from the thyroid gland. Following a diagnosis of infected thyroglossal duct cyst by fine needle aspiration biopsy, the mass was removed by surgery. Histopathologic diagnosis was Hashimoto's thyroiditis that developed from the ectopic thyroid tissue on the wall of thyroglossal duct cyst.

Detection of Epstein-Barr virus DNA by polymerase chain reaction in surgical specimens of patients with squamous cell carcinoma of the larynx and vocal cord nodules.

OBJECTIVES: We investigated the incidence of Epstein-Barr virus (EBV) infection in surgical specimens of squamous cell carcinoma of the larynx and vocal cord nodules. PATIENTS AND METHODS: Formalin-fixed, paraffin-embedded tissue samples randomly selected from 22 patients with squamous cell carcinoma of the larynx (20 males, 2 females; mean age 52 years) and from 17 patients with vocal cord nodules (14 males, 3 females; mean age 38 years) were examined by the polymerase chain reaction. The patients were assessed in terms of localization of the disease, smoking habits, duration of smoking, and the presence or absence of EBV DNA. RESULTS: Twenty-one patients with laryngeal carcinoma and nine patients with vocal cord nodules were smokers. Polymerase chain reaction showed EBV DNA in 11 patients (50%) with laryngeal carcinoma and in seven patients (41.2%) with vocal cord nodules. No significant differences were found with respect to EBV DNA positivity, smoking habits, smoking period, the number of cigarettes consumed daily, localization of disease, and tumor stage (p>0.05). CONCLUSION: Epstein-Barr virus does not seem to be directly associated with the pathogenesis of laryngeal squamous cell carcinoma, but its role in the etiology of laryngeal proliferative diseases needs more elucidation.

[The efficacy of combining antibiotic treatment with topical intranasal steroid administration in the treatment of chronic otitis media with effusion]. / Efüzyonlu otitis media tedavisinde antibiyotik ile birlikte intranazal steroid kullaniminin etkinligi.

OBJECTIVES: We evaluated the efficacy of antibiotic treatment with or without topical administration of intranasal budesonide in chronic otitis media with effusion (OME). PATIENTS AND METHODS: The study included 62 patients (age range 2 to 12 years) with chronic OME. The patients were randomly assigned to three groups, namely, antibiotic treatment (20 patients, ampicillin/sulbactam, 25 mg/kg/daily), antibiotic treatment combined with intranasal budesonide (20 patients, 200 mg/daily), and no treatment (22 patients). All patients and families were questioned regarding the presence of allergy, frequent upper respiratory tract infections, passive smoking, low birth weight, and pre-school nursery attendance. Otoscopic examination findings and the results of tympanograms obtained at the time of diagnosis, and at the end of four and eight weeks of treatment were evaluated. RESULTS: At the end of eight weeks, significant improvement in tympanograms and otoscopic findings was obtained in both groups when compared with the control group (p<0.05). Resolution rates were 24% (9/37 ears), 39% (14/36), and 5% (2/40) with antibiotic, budesonide, and no treatment groups, respectively. Although budesonide treatment was associated with a higher rate of resolution of effusion compared to that of antibiotic alone, this did not reach significance (p>0.05). CONCLUSION: Further studies with larger patient series are required to better evaluate the efficacy of antibiotic treatment and topical intranasal steroid administration in chronic OME.

Laryngeal neurofibroma associated with neurofibromatosis type 2.

We present a case of laryngeal neurofibroma associated with neurofibromatosis type 2. Although laryngeal neurofibromas have previously been reported in cases of neurofibromatosis type 1, their presence has never been described in a patient with neurofibromatosis type 2.

[Efficacy of topical ciprofloxacin and tobramycin in combination with dexamethasone in the treatment of chronic suppurative otitis media]. / Kronik süpüratif otitis media tedavisinde topikal siprofloksasin ve tobramisinin deksametazon ile kullanimi.

OBJECTIVES: To evaluate the efficacy of topical ciprofloxacin and tobramycin with and without topical dexamethasone in the treatment of chronic suppurative otitis media without cholesteatoma. PATIENTS AND METHODS: The study included 103 ears of 80 patients (49 males, 31 females; mean age 31 years; range 18 to 60 years) with chronic suppurative otitis media without cholesteatoma. The patients were randomly divided into four groups to receive topical applications of either ciprofloxacin and tobramycin alone, or in combination with dexamethasone. Cultures were obtained from the ears preoperatively and 24 hours after treatment. RESULTS: Aerobic bacteria were isolated in 94.1% of patients before the treatment, the most common being Pseudomonas aeruginosa (38.9%). With dexamethasone, the clinical response for ciprofloxacin and tobramycin increased from 80% to 90% and from 70% to 75%, respectively, but this improvement was not significant (p > 0.03). Addition of dexamethasone to ciprofloxacin decreased the recovery period from 14 days to seven days, whereas no change (7 days) was observed with tobramycin. CONCLUSION: The efficacy of ciprofloxacin and tobramycin were similar in the treatment of chronic suppurative otitis media. Addition of dexamethasone to ciprofloxacin decreased the treatment period.

The role of free oxygen radicals in noise induced hearing loss: effects of melatonin and methylprednisolone.

The aim of this study was to investigate the role of cochlear damage caused by free oxygen radicals occurring as a result of exposure to noise and to determine the prophylactic effects of melatonin and methylprednisolone. Fifty male albino guinea pigs were randomly divided into five groups. All groups were exposed to 60 h of continuous wide band noise at 100+/-2 dB, except group I. Group I was not exposed to noise or treated with drugs. Group II was exposed to noise and not treated with drugs. Group III was exposed to noise and treated with melatonin. Group IV was exposed to noise and treated with methylprednisolone. Group V was exposed to noise and treated with melatonin and methylprednisolone. A high dose of 40 mg/kg methylprednisolone and/or 20 mg/kg melatonin were administered intramuscularly 24 h before exposure to noise, immediately before noise exposure and once a day until noise exposure was completed. Just after the noise ended, guinea pigs were decapitated. Venous blood was obtained into tubes with EDTA and it was used to measure activity levels of plasma malondialdehyde, erythrocyte glutathione peroxidase and the cochlear tissue malondialdehyde. After the noise ended, in comparison group II with I; it was found that the malondialdehyde activity of the plasma and tissue had increased, the erythrocyte glutathione peroxidase activity levels had decreased and consequently, hearing thresholds had increased (P<0.01). A significant difference was found in the malondialdehyde and erythrocyte glutathione peroxidase activity levels between groups II and III (P<0.01) and the hearing thresholds exhibited a parallel trend (P<0.05). The hearing threshold and malondialdehyde activity levels obtained from groups IV and V were found to be similar to those of group II (P>0.05). As a conclusion, we suggest that the use of methlyprednisolone in order to prevent the cochlear damage caused by noise does not provide sufficient prophylaxy, however the use of melatonin provides a more effective prophylaxy, thus being a promising alternative.