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1.
Turk J Med Sci ; 50(4): 855-859, 2020 06 23.
Artigo em Inglês | MEDLINE | ID: mdl-32283908

RESUMO

Background/aim: To emphasize the role of cochlear implantation (CI) in the auditory rehabilitation of patients with otosclerosis (OS) and share our surgical experiences on this rare group of patients. Materials and methods: Retrospective analysis of the patients who have a diagnosis of otosclerosis and implanted between January 1998­May 2019 was performed. Preoperative and postoperative clinical, radiological, audiological and surgical findings are presented. Results: Among 2195 patients who have been implanted in our institution, 12 (0.54%) met the diagnostic criteria of OS according to their preoperative (clinical, radiological, audiological) and peroperative (surgical) findings. Electrode insertion was performed via "round window membrane and cochleostomy" in 8 and 4 patients, respectively. No major complications occured. All patients showed satisfactory performances by means of audiometric scores postoperatively. Nonauditory stimulation (NAS) which manifested as "facial twitching" was a challenging problem in one patient during the surgery and subsided after the operation. Conclusion: Our experience on CI in patients with OS revealed that the implantation was a relatively safe procedure and had satisfactory impact on audiological performances.


Assuntos
Implante Coclear , Otosclerose/cirurgia , Adulto , Idoso , Audiometria , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos
2.
Am J Otolaryngol ; 37(2): 74-7, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26954855

RESUMO

PURPOSE: We aimed to determine the effect of a cartilage shoe graft placed between the foot of the TORP and the stapes footplate on hearing improvement and long-term displacement rates. MATERIALS AND METHODS: Patients who underwent TORP ossiculoplasty were divided into two groups. The TORP-alone group consisted of 32 patients who underwent TORP placement without cartilage shoe graft and served as the control group. The study group consisted of 56 patients who underwent placement of cartilage shoe graft together with TORP. Pure-tone audiometry was administered to all patients before and 3, 6 and 12 months after surgery. Indications for surgery, surgical technique used, postoperative complications, and air and bone conduction thresholds at 500, 1000, 2000 and 4000 Hz were recorded for all patients. RESULTS: No significant difference in postoperative air-bone gaps was observed between the groups. The number of patients with air-bone gaps less than 20 dB was 14 (25%) in the study group and 8 (25%) in the control group. There was no significant difference in changes in air-bone gaps between the groups. Dislocation of the prosthesis was observed in 3 patients in the study group (5.3%) and 4 in the control group (12.5%). There was less dislocation of the prosthesis in the study group, but the difference was not statistically significant. CONCLUSION: Placement of a cartilage graft between the footplate of the stapes and the foot of the prosthesis may have positive effects on long-term hearing improvement and rates of prosthesis displacement. Further research with larger patient numbers is needed to identify the advantages of shoe graft.


Assuntos
Condução Óssea/fisiologia , Cartilagem/transplante , Perda Auditiva/cirurgia , Audição/fisiologia , Prótese Ossicular , Adolescente , Adulto , Idoso , Audiometria de Tons Puros , Criança , Feminino , Seguimentos , Perda Auditiva/fisiopatologia , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Fatores de Tempo , Adulto Jovem
3.
J Craniofac Surg ; 27(2): e207-8, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26872283

RESUMO

Frontal sinus fractures (FSF) are relatively uncommon maxillofacial injuries. The most common cause of FSF is motor vehicle accidents with 62% percentage. Management of FSF depends on type of fracture, associated injuries, and involvement of naso-frontal duct. In this report, the authors presented a patient with comminuted fracture of anterior wall of frontal sinus reconstructed with titanium mesh. A 40-year-old man presented with depression of the frontal bone, facial pain, and epistaxis consisting of a motor vehicle accident. Computerized tomography scan revealed multiple comminuted fractures of anterior wall of frontal sinus and fractures of left orbital medial and superior walls. Titanium mesh was used for reconstruction. Postoperative course was uneventful. The titanium mesh, which is easy to handle with no complications, may provide excellent frontal contour after comminuted anterior wall fractures.


Assuntos
Fraturas Cominutivas/cirurgia , Seio Frontal/lesões , Seio Frontal/cirurgia , Fraturas Cranianas/cirurgia , Telas Cirúrgicas , Titânio , Acidentes de Trânsito , Fraturas Cominutivas/diagnóstico por imagem , Osso Frontal/cirurgia , Seio Frontal/diagnóstico por imagem , Humanos , Masculino , Fraturas Cranianas/diagnóstico por imagem , Tomografia Computadorizada por Raios X
4.
J Craniofac Surg ; 27(7): 1802-1803, 2016 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-27513783

RESUMO

Though the lymphangioma is a benign neoplasm, it may make an invasion to vital structures by progressively growing. For lymphangioma, which progressed in such a way, surgical treatment has high morbidity and recurrence risk. On these cases, OK-432 is a frequently used sclerotherapy agent. The authors report the result they obtained by the use of single-dose OK-432 on an inoperable pediatric cervical macrocystic lymphangioma case and also their experiences.


Assuntos
Neoplasias de Cabeça e Pescoço/tratamento farmacológico , Linfangioma/tratamento farmacológico , Picibanil/administração & dosagem , Antineoplásicos/administração & dosagem , Pré-Escolar , Relação Dose-Resposta a Droga , Feminino , Neoplasias de Cabeça e Pescoço/diagnóstico , Humanos , Biópsia Guiada por Imagem , Linfangioma/diagnóstico , Imageamento por Ressonância Magnética
5.
J Craniofac Surg ; 26(8): e696-7, 2015 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-26594977

RESUMO

Sialolipoma is a newly recognized tumor of the major and minor salivary glands and represents only 0.3% of all salivary gland tumors. Only 3 cases of congenital sialolipoma are available in the literature. In the current case, we performed a total parotidectomy with facial nerve preservation on a 12-week-old infant exhibiting huge mass in the parotid region. Histopathology results showed sialolipoma. There was no recurrence at the 18-month follow-up. Although it is a very rare disease in infants, congenital sialolipoma should be kept in mind in patients with parotid mass. The primary treatment is parotidectomy with facial nerve preservation.


Assuntos
Lipoma/congênito , Neoplasias Parotídeas/congênito , Nervo Facial/patologia , Feminino , Seguimentos , Humanos , Lactente , Lipoma/cirurgia , Neoplasias Parotídeas/cirurgia , Doenças Raras/congênito
6.
Ann Otol Rhinol Laryngol ; 123(11): 771-7, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24944272

RESUMO

OBJECTIVE: This study was designed to research the effects of radiofrequency thermal ablation (RFTA) surgery on the nasal cycle, with anterior rhinomanometry being used for assessment. METHODS: Thirty patients with inferior concha hypertrophy and 13 healthy volunteers were included in this study. An anterior rhinomanometry was performed on each of the patients before surgery and at 1 month and 6 months after surgery, and on the volunteers in the control group, simultaneously. RESULTS: Nineteen of the 30 patients and 8 of the 13 healthy participants showed a distinct type of nasal cycle at different periods of measurement. The mean of the total nasal airflow of the patients was lower before RFTA surgery but increased at a rate of 71.07%, closer to the value of the control group, after RFTA surgery. After RFTA, the unilateral nasal airflow (fmin and fmax) values increased at ratios of 22.36% and 94.44%, respectively. The amplitude (fmax-fmin) showed a statistically significant decrease in the postoperative period (108.43 ± 54.37), when compared with that of the preoperative period (202.80 ± 81.24) (P < .01). CONCLUSION: We conclude that the RFTA is a useful method for treating inferior concha hypertrophy, because it positively affects the nasal physiology, increasing the total nasal airflow without changing the nasal cycle time.


Assuntos
Ablação por Cateter , Cavidade Nasal/fisiologia , Rinomanometria , Conchas Nasais/patologia , Conchas Nasais/cirurgia , Adolescente , Adulto , Idoso , Estudos de Casos e Controles , Feminino , Humanos , Hipertrofia/cirurgia , Masculino , Pessoa de Meia-Idade , Obstrução Nasal/etiologia , Obstrução Nasal/cirurgia , Adulto Jovem
7.
J Craniofac Surg ; 24(6): 2174-6, 2013 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24220433

RESUMO

We report a case of a 32-year-old woman who presented with bilateral parotid gland enlargement. She had no systemic symptoms such as fever, cough, and weight loss. She had bilateral blindness for a long time. The results of a physical examination revealed a bilateral firm, painless mass in the parotid region. A computed tomographic scan showed no clear lymphadenopathy in the neck but showed localized infiltrates and multiple pulmonary nodules with enlargement of the mediastinal and axillary lymph nodes in the chest. The patient underwent a superficial parotidectomy. A histopathologic finding revealed an epithelioid noncaseating granuloma, which is consistent with sarcoidosis. In summary, this current study shows that sarcoidosis should be considered in the differential diagnosis of all painless swelling of the parotid gland, especially in women, which could be an earlier complaint.


Assuntos
Cegueira/complicações , Doenças Parotídeas/diagnóstico , Sarcoidose/diagnóstico , Adulto , Diagnóstico Diferencial , Feminino , Seguimentos , Humanos , Linfonodos/diagnóstico por imagem , Doenças Parotídeas/diagnóstico por imagem , Sarcoidose/diagnóstico por imagem , Sarcoidose Pulmonar/diagnóstico , Sarcoidose Pulmonar/diagnóstico por imagem , Tomografia Computadorizada por Raios X/métodos
12.
Turk J Pediatr ; 62(6): 1021-1027, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33372441

RESUMO

BACKGROUND: Idiopathic facial paralysis or Bell`s palsy is the most common type of peripheral facial paralysis. Children with Bell`s palsy is an uneasy situation for the family and physician with questions about the etiology, treatment options and the healing process. Here, we aimed to compare the epidemiologic features and prognostic factors of patients with Bell`s palsy aged < 18 years. METHODS: Records of patients with Bell`s palsy who were admitted to our clinic between January 2008 and December 2017 were evaluated. RESULTS: Forty-seven patients with Bell`s palsy were included to this study. The patients` ages varied between 7 and 17 (14.7±2.5) years. At the end of at least 6 months of follow-up, 32 (68.1%) of the patients presented with House Brackmann (HB) grade 1 facial paralysis, while 12 (25.5%) of them had grade 2 and 3 (6.4%) of them had grade 3 facial paralysis. Mean neutrophil-to-lymphocyte ratio (NLR) in patients with advanced grades (grade 4, 5, 6) was higher, compared to that of patients with grade 2 and 3 (4.10 ± 1.06 vs 1.34 ± 1.02 (p < 0.001). CONCLUSIONS: In our study, the response rate to treatment was high. In differential diagnosis, congenital anomalies, malignancy, trauma, middle ear infection and surgery should be considered. In addition, NLR at admission can be considered as a prognostic factor.


Assuntos
Paralisia de Bell , Paralisia Facial , Adolescente , Paralisia de Bell/diagnóstico , Paralisia de Bell/epidemiologia , Paralisia de Bell/terapia , Criança , Humanos , Linfócitos , Prognóstico , Resultado do Tratamento
13.
Eur Arch Otorhinolaryngol ; 266(11): 1807-14, 2009 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-19242711

RESUMO

Snoring is a common complaint, especially among the elderly individuals. In the treatment of snoring, many options, surgical or nonsurgical, are available. In this randomized study, we used a modified technique including some components of radiofrequency-assisted uvulopalatoplasty (RAUP) and Uvulopalatopharyngoplasty UPPP (modified-RAUP, MRAUP) and RAUP in a control group. A total of 60 patients (58 male and 2 female), 30 in each group (MRAUP and RAUP groups), with an average age of 38 +/- 9 years were included in the study. In the MRAUP group, in addition to the modified surgery, preoperative steroid injection was used as a preemptive analgesic and pre-incisional steroid injection and closure of the edges of the incision were performed to achieve better relief of pain. Snoring score, pain at rest and during swallowing, analgesic consumption and speech score were evaluated using standard 10 cm visual analog scales (VAS). Operation time and other complications were recorded. The patients in the MRAUP group had better pain scores, both at rest and during swallowing, and less analgesic consumption. Although operation time was longer in the MRAUP group compared to that of the RAUP group, snoring score, evaluated from day 1 to the 6th month after operation, was significantly better in the MRAUP group. Postoperative speech scores at each visit were similar in both groups. In the MRAUP group, 87% of the patients (26 patients) had a final VAS for snoring below 3, while in the RAUP group 63% of the patients (19 patients) were below 3 on the scale (P < 0.05). Thus, MRAUP seems to be a promising technique for surgery as a treatment for snoring.


Assuntos
Eletrocoagulação/métodos , Dor Pós-Operatória/prevenção & controle , Ronco/cirurgia , Úvula/cirurgia , Adolescente , Adulto , Analgésicos/uso terapêutico , Eletrocoagulação/efeitos adversos , Feminino , Seguimentos , Glucocorticoides/uso terapêutico , Humanos , Masculino , Pessoa de Meia-Idade , Dor Pós-Operatória/etiologia , Estudos Prospectivos , Ronco/patologia , Resultado do Tratamento , Adulto Jovem
14.
J Craniofac Surg ; 20(4): 1059-60, 2009 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-19634216

RESUMO

The incidence of Burkitt lymphoma (BL) during pregnancy is rare. We report a case of nasal BL with symptoms mimicking chronic rhinosinusitis and extensive unilateral polyposis in a pregnant woman. Functional endoscopic sinus surgery was performed. Histopathologic examination suggested a BL, and chemotherapy was initiated. She was not given radiotherapy. She has kept free of disease for 9 months since the completion of treatment. When a physician is confronted with unusual localization among the polypoid tissue described here, a complete differential diagnosis must be done.


Assuntos
Linfoma de Burkitt/diagnóstico , Pólipos Nasais/diagnóstico , Complicações Neoplásicas na Gravidez/diagnóstico , Adulto , Antineoplásicos/uso terapêutico , Linfoma de Burkitt/tratamento farmacológico , Linfoma de Burkitt/patologia , Linfoma de Burkitt/cirurgia , Diagnóstico Diferencial , Endoscopia , Feminino , Humanos , Pólipos Nasais/patologia , Pólipos Nasais/cirurgia , Gravidez , Complicações Neoplásicas na Gravidez/tratamento farmacológico , Complicações Neoplásicas na Gravidez/patologia , Complicações Neoplásicas na Gravidez/cirurgia
15.
Paediatr Anaesth ; 18(9): 878-83, 2008 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-18768048

RESUMO

BACKGROUND: Postoperative vomiting (POV) is a common complication after tonsillectomy. Dexamethasone is known to decrease postsurgical vomiting. In this study, we compared the effects of dexamethasone alone to dexamethasone plus propofol on postoperative vomiting in children undergoing tonsillectomy. METHODS: In a randomized double-blinded study, we evaluated 80 healthy children, aged 4-12 years, who underwent tonsillectomy with or without adenoidectomy. After anesthesia was induced by inhalation of sevoflurane, 0.15 mg x kg(-1) dexamethasone and 2 microg x kg(-1) fentanyl was administered i.v. to all patients. The patients in the dexamethasone plus propofol group received 1 mg x kg(-1) propofol before intubation and continuously after intubation at a rate of 20 microg x kg(-1) x min(-1) until the surgery was completed. Data for postoperative vomiting were grouped into the following time periods: 0-4 and 4-24 h. Data were analyzed using a Student's t-test and chi-squared analysis. RESULTS: The percentage of patients exhibiting a complete response (defined as no retching or vomiting for 24 h) increased from 37.5% in the dexamethasone-alone group to 75% in the dexamethasone plus propofol group (P = 0.001). Twenty-two patients (55%) in the dexamethasone-alone and nine patients (22.5%) in the dexamethasone plus propofol groups experienced vomited during 0-4 h (P = 0.003). Eight patients in the dexamethasone-alone group and three patients in the dexamethasone plus propofol group received ondansetron as a rescue antiemetic during the postoperative period. CONCLUSION: For children undergoing tonsillectomy, intraoperative subhypnotic propofol infusion combined with dexamethasone treatment provides a better prophylaxis against postoperative vomiting than does dexamethasone alone.


Assuntos
Anestésicos Intravenosos/administração & dosagem , Antieméticos/administração & dosagem , Dexametasona/administração & dosagem , Náusea e Vômito Pós-Operatórios/prevenção & controle , Propofol/administração & dosagem , Tonsilectomia/efeitos adversos , Criança , Pré-Escolar , Método Duplo-Cego , Quimioterapia Combinada , Feminino , Humanos , Masculino , Ondansetron/uso terapêutico , Resultado do Tratamento
16.
Rhinology ; 46(4): 328-33, 2008 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-19146005

RESUMO

OBJECTIVE: Silicosis due to denim (or jean) sandblasters is newly described cause of silicosis. In such cases lungs are severely affected due to heavy exposure to silica without serious protection. We aimed to investigate whether silica had an effect on the upper airways and eyes. METHODS: The study included the patients recently diagnosed with silicosis. For comparisons, a control group was constituted. Firstly, a questionnaire was performed to obtain demographic and exposure characteristics of the cases. Later, routine nasal examination by endoscope and routine eye examination by slit-lamp microscope were performed to investigate presence of rhinitis and/or adenoid vegetation and eye findings associated with dust exposure, respectively, in both patient and control groups. Punch biopsies of the adenoid tissue were obtained using an endoscopic telescope with the patient under local anesthesia and sent for histopathologic examination. In addition, nasal pH and mucociliary clearance were investigated. Both pH and saccharin nasal transport time (SNTT) measurements were performed by two physicians, who reached a final consensus. RESULTS: The study group consisted of 83 male silicotics with an average age of 23 +/- 6 years, and the control group consisted of 84 age and gender matched healthy individuals. Their mean exposure time was 40 +/- 26 months. On routine nasal examination, silicotics had higher rates of rhinitis (28.9% versus 16.7%) mostly ipsilaterally (p = 0.01), adenoid vegetation (32.5% versus 13.3%/, p < 0.05), conjunctival hyperaemia (70% versus 45%, p < 0.001), pingueculae (68% versus 23%, p < 0.01), papillar formation (40% versus 28%), and higher nasal pH values (7.9 +/- 0.7 versus 6.9 +/- 0.6, p < 0.001), higher SNTT values (19.9 +/- 2.9 versus 10.9 +/- 1.9, p < 0.001) compared with the controls. CONCLUSION: The results of our study suggest that upper airways and eyes are considerably affected in the patients with silicosis. Thus, appropriate protection is required to prevent the development of such problems in denim sandblasters.


Assuntos
Oftalmopatias/etiologia , Doenças Nasais/etiologia , Exposição Ocupacional/efeitos adversos , Silicose/etiologia , Indústria Têxtil , Adolescente , Adulto , Distribuição de Qui-Quadrado , Endoscopia , Oftalmopatias/epidemiologia , Oftalmopatias/fisiopatologia , Humanos , Concentração de Íons de Hidrogênio , Masculino , Doenças Nasais/epidemiologia , Doenças Nasais/fisiopatologia , Silicose/epidemiologia , Silicose/fisiopatologia , Inquéritos e Questionários , Tomografia Computadorizada por Raios X , Turquia/epidemiologia
17.
Auris Nasus Larynx ; 35(1): 157-9, 2008 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-17884320

RESUMO

Epithelioid hemangioendothelioma (EH) is a seldom tumor of vascular origin, which occurs at sites such as liver, lung or soft tissues, and has a highly unpredictable malignant potential and clinical course. We submitted a case with epithelioid hemangioendothelioma of submandibular gland. The patient was a 44-year-old woman who presented with left submandibular painly mass. Fine needle aspiration showed a mixed lymphoid population. Contrast enhanced Computerize Tomography (CT) scan revealed that to be a well-circumscribed and including microcalcification in centre 2.5 cm x 2.0 cm mass in diameter without evidence of bony invasion. Submandibular gland was excised. The pathological result was interpretated as epithelioid hemangioendothelioma of the submandibular gland. The patient was seen regularly for recurrence.


Assuntos
Hemangioendotelioma Epitelioide/diagnóstico , Neoplasias da Glândula Submandibular/diagnóstico , Adulto , Biópsia por Agulha Fina , Calcinose/diagnóstico , Calcinose/patologia , Calcinose/cirurgia , Feminino , Hemangioendotelioma Epitelioide/patologia , Hemangioendotelioma Epitelioide/cirurgia , Humanos , Glândula Submandibular/patologia , Glândula Submandibular/cirurgia , Neoplasias da Glândula Submandibular/patologia , Neoplasias da Glândula Submandibular/cirurgia , Tomografia Computadorizada por Raios X
18.
Kulak Burun Bogaz Ihtis Derg ; 17(1): 58-62, 2007.
Artigo em Inglês | MEDLINE | ID: mdl-17483615

RESUMO

Neurofibroma of the parapharyngeal space accounts for less than 2% of all parapharyngeal space neoplasms. A 38-year-old man presented with complaints of snoring and left-sided nasal obstruction. Medical history also revealed numerous huge skin neurofibromas and multiple café au lait spots all over the body. Pharyngeal endoscopic examination disclosed a firm, nonpulsatile submucosal mass, pushing the left pharyngeal region approximately 5 cm medially, and extending to the inferior part of the epiglottis. The tumor was removed by transoral excision without any subsequent complications. Histological and immunohistochemical examinations revealed a neurofibroma.


Assuntos
Neurofibroma/diagnóstico , Neoplasias Faríngeas/diagnóstico , Adulto , Diagnóstico Diferencial , Humanos , Masculino , Obstrução Nasal/etiologia , Neurofibroma/complicações , Neurofibroma/diagnóstico por imagem , Neurofibroma/patologia , Neurofibroma/cirurgia , Procedimentos Cirúrgicos Otorrinolaringológicos , Neoplasias Faríngeas/complicações , Neoplasias Faríngeas/diagnóstico por imagem , Neoplasias Faríngeas/patologia , Neoplasias Faríngeas/cirurgia , Radiografia
19.
Ann Clin Lab Sci ; 36(3): 312-8, 2006.
Artigo em Inglês | MEDLINE | ID: mdl-16951273

RESUMO

L-carnitine (LC) protects cells from peroxidative damage. In this study, we tested whether L-carnitine (LC) prevents radiation-induced cochlear damage after total cranial irradiation (radiotherapy; RT). Male albino guinea pigs were randomly distributed in 3 groups. The Control group (n = 11) received neither LC nor irradiation, but saline solution ip and sham irradiation for 5 days. The RT group (n = 32) received saline solution ip as placebo therapy and exposure to total cranial irradiation of 33 Gy in 5 fractions of 6.6 Gy/day on 5 successive days, with a calculated (alpha/beta = 3.5) biological effective dose of fractionated irradiation equal to 60 Gy conventional fractionation. The LC + RT group (n = 36) received total cranial irradiation, plus LC (100 mg/kg/day, ip) for 5 days. The guinea pigs were killed at 4, 24, or 96 hr after the last dose of RT and the cochleas were enucleated for histopathologic examination. There was no cochlear degeneration in the control group. In the RT group, total cranial irradiation caused degeneration in stria vascularis (SV), spiral ganglion (SG), outer hair cells (OHC), and inner hair cells (IHC) of cochleas at 4, 24, and 96 hr. In the LC + RT group, LC administration reduced radiation-induced cochlear degeneration in SV and SG at 4, 24, and 96 hr, and in OHC and IHC at 24 and 96 hr (p <0.05). Thus, this study shows that L-carnitine can ameliorate radiation-induced cochlear damage in guinea pigs.


Assuntos
Carnitina/uso terapêutico , Cóclea/efeitos da radiação , Raios gama/efeitos adversos , Lesões Experimentais por Radiação/prevenção & controle , Animais , Irradiação Craniana , Cobaias , Masculino
20.
Ann Clin Lab Sci ; 34(3): 341-6, 2004.
Artigo em Inglês | MEDLINE | ID: mdl-15487711

RESUMO

The aims of this study were: (a) to assess whether the increased oxidative stress in otitis media with effusion (OME) induced in guinea pigs by histamine injection into the middle ear cavity is reflected by lipid peroxidation in erythrocytes, plasma, and middle ear effusion fluid; (b) to survey the alterations of oxidant and antioxidant enzyme activities in experimental OME; and (c) to determine the effects of melatonin and methylprednisolone on this oxidative stress. Malondialdehyde (MDA) level, erythrocyte total (enzymatic plus non-enzymatic) superoxide scavenger activity (TSSA), non-enzymatic superoxide scavenger activity (NSSA), superoxide dismutase (SOD), catalase (CAT), and xanthine oxidase (XO) activities were measured in 4 groups of 7 guinea pigs at 3 hr after injection of 0.1 ml of histamine (or saline) into the middle ear. Group I was the control group, Group II was an experimental group with OME induced by histamine, Group III was a melatonin-pretreated OME group, and Group IV was a methylprednisolone-pretreated OME group. In erythrocyte, plasma, and middle ear effusion samples, MDA levels were significantly increased in guinea pigs with OME (Group II), compared to controls (Group I); erythrocyte TSSA and SOD activities were lower and erythrocyte XO activity was increased in guinea pigs with OME (Group II) compared to controls (Group I). No significant differences were found in erythrocyte NSSA and CAT activities. In Group III, pretreatment of guinea pigs with i.p. melatonin at 1 hr prior to histamine induction of OME decreased the erythrocyte, plasma, and effusion MDA levels, compared to Group II; erythrocyte XO activity was diminished and erythrocyte TSSA, SOD, and CAT activities were increased in Group III compared to Group II. In Group IV, pretreatment of guinea pigs with i.p. methylprednisolone at 1 hr prior to histamine induction of OME decreased the plasma and effusion MDA levels and increased the erythrocyte TSSA and SOD activities, compared to Group II. These results suggest that reactive oxygen species (ROS) play a role in histamine-induced OME. Pretreatment with i.p. melatonin or methylprednisolone both decrease the ROS generated by experimental OME, but melatonin appears to be more effective than methylprednisolone.


Assuntos
Antioxidantes/uso terapêutico , Eritrócitos/enzimologia , Melatonina/uso terapêutico , Otite Média com Derrame/prevenção & controle , Animais , Modelos Animais de Doenças , Eritrócitos/efeitos dos fármacos , Cobaias , Histamina/farmacologia , Peroxidação de Lipídeos/efeitos dos fármacos , Malondialdeído/metabolismo , Metilprednisolona/uso terapêutico , Otite Média com Derrame/metabolismo , Otite Média com Derrame/patologia , Estresse Oxidativo/fisiologia , Espécies Reativas de Oxigênio/metabolismo
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