The role of the chinchilla pinna and ear canal in electrophysiological measures of hearing thresholds

1998 ◽  
Vol 103 (4) ◽  
pp. 1951-1956 ◽  
Author(s):  
W. J. Murphy ◽  
R. R. Davis
Keyword(s):  
Ear Canal ◽  
Hearing Thresholds

Otitis externa: the role of the veterinary nurse

2021 ◽  
Vol 12 (7) ◽  
pp. 306-310
Author(s):  
Sue Paterson
Keyword(s):  
Primary Care ◽  
Otitis Externa ◽  
Diagnosis And Treatment ◽  
External Ear ◽  
Ear Canal ◽  
Veterinary Practice ◽  
External Ear Canal ◽  
Veterinary Surgeon

Otitis externa is a common problem in primary care veterinary practice. While the diagnosis and treatment of disease is the responsibility of the attending veterinary surgeon, the veterinary nurse, as an integral part of the veterinary surgeon-led team, plays an important role in the investigation and management of disease. Veterinary nurses are more than capable of assessing the external ear canal both macroscopically and cytologically to help the veterinary surgeon to make a diagnosis. Client facing nurse communications can help with the administration of therapy, provide owner support during treatment to increase compliance and help with follow-up assessments.

scholarly journals The Role of Antioxidants in the Treatment of Congenital CMV-Related Hearing: A Case-Control Study

OTO Open ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 2473974X1984185 ◽  
Author(s):  
Hilary McCrary ◽  
Veronica del Calvo ◽  
Jeremy Purser ◽  
Geoff Casazza ◽  
Albert Park
Keyword(s):  
Hearing Loss ◽  
Case Control Study ◽  
Retrospective Chart Review ◽  
Case Control ◽  
Antioxidant Therapy ◽  
Hearing Thresholds ◽  
The Mean ◽  
The Right ◽  
Control Study

Objective Antioxidants have been used as a therapeutic measure for several causes of hearing loss, and this study aims to examine the use of antioxidants in children with congenital cytomegalovirus (cCMV)–related hearing loss. Study Design Case-control study. Setting Academic pediatric hospital. Subjects and Methods A retrospective chart review of pediatric patients with cCMV-related hearing loss treated with and without antioxidants (vitamins A, C, and E and magnesium, known as ACE-Mg) was completed. The primary end point was the mean change in hearing thresholds for the right and left ears after therapy. An evaluation of the mean change in thresholds was evaluated at the following frequencies: 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz. A 2-sample t test and multiple linear regression were used to evaluate the data. Results A total of 78 children with cCMV-related hearing loss were included in the study, of whom 10 were treated with antioxidants. The average amount of time in which antioxidants were taken was 387 days. When comparing cases and controls, there was no differences in the mean change of hearing thresholds at each frequency for both the right and left ears ( P > .05). Length of antioxidant therapy and age at which therapy was initiated had no effect on hearing scores ( P > .05). Conclusions Oxidative stress plays a role in the pathogenesis of cCMV-related hearing loss. ACE-Mg is a safe adjuvant therapy for the treatment of hearing loss in children; however, this study demonstrates no hearing-related benefit from ACE-Mg antioxidant therapy.

scholarly journals Estimation of bone conduction skull transmission by hearing thresholds and ear-canal sound pressure

2013 ◽  
Vol 299 ◽  
pp. 19-28 ◽  
Author(s):  
Sabine Reinfeldt ◽  
Stefan Stenfelt ◽  
Bo Håkansson
Keyword(s):  
Sound Pressure ◽  
Bone Conduction ◽  
Ear Canal ◽  
Hearing Thresholds

scholarly journals Contralateral Occlusion Test (COT): the effect of external ear canal occlusion with aging

CoDAS ◽  
2019 ◽  
Vol 31 (3) ◽  
Author(s):  
Luís Roque Reis ◽  
Luís Castelhano ◽  
Filipe Correia ◽  
Pedro Escada
Keyword(s):  
Hearing Loss ◽  
Tuning Fork ◽  
Age Groups ◽  
Sound Field ◽  
External Ear ◽  
Ear Canal ◽  
Occlusion Test ◽  
External Ear Canal ◽  
Hearing Thresholds ◽  
And Gender

ABSTRACT Purpose This study aimed to evaluate the effects of complete external ear canal occlusion on hearing thresholds with aging. The goal was to decide which tuning fork is more appropriate to use for the contralateral occlusion test (COT), in individuals of different ages. Methods Forty-two normal hearing subjects between 21 and 67 years were divided into three age groups (20-30 years, 40-50 years, and 60-70 years). Participants underwent sound field audiometry tests with warble tones, with and without ear canal occlusion. Each ear was tested with the standard frequencies (250, 500, 1000, and 2000 Hz). The contralateral ear was suppressed by masking. Results Hearing thresholds showed an increase as the frequency increased from 20.85 dB (250 Hz, 20-30 years group) to 48 dB (2000 Hz, 60-70 years group). The threshold differences between occlusion and no occlusion conditions were statistically significant and increased ranging from 11.1 dB (250 Hz, 20-30 years group) to 32 dB (2000 Hz, 20-30 years group). We found statistically significant differences for the three age groups and for all evaluations except to 500 Hz difference and average difference. The mean hearing loss produced by occlusion at 500 Hz was approximately 19 dB. We found no statistically significant differences between right and left ears and gender for all measurements. Conclusion We conclude that the use of the 512 Hz tuning fork is the most suitable for COT, and its use may allow clinicians to distinguish mild from moderate unilateral conductive hearing loss.

Role of Langerhans cells, Ki-67 protein and apoptosis in acquired cholesteatoma: prospective clinical study

2013 ◽  
Vol 127 (3) ◽  
pp. 252-259 ◽  
Author(s):  
V Akdogan ◽  
I Yilmaz ◽  
T Canpolat ◽  
L N Ozluoglu
Keyword(s):  
Middle Ear ◽  
Langerhans Cells ◽  
Prospective Clinical Study ◽  
Ear Canal ◽  
Ki 67 ◽  
Middle Ear Cholesteatoma ◽  
Proliferation And Apoptosis ◽  
Acquired Cholesteatoma ◽  
Open Versus

AbstractObjective:To investigate the role of Langerhans cells in the pathogenesis and clinical picture of middle-ear cholesteatoma.Subjects and methods:The study included 40 patients operated upon for a diagnosis of chronic otitis due to acquired cholesteatoma.Results and analysis:A closed surgical technique was used in 20 per cent of patients and an open technique in 80 per cent. Langerhans cells were more densely accumulated in cholesteatoma epithelium, compared with external ear canal skin (p < 0.001). Staining for Ki-67 protein was greater in cholesteatoma epithelium (p < 0.001) and Apo2.7 protein staining (indicating apoptosis) was more prominent (p < 0.001), compared with ear canal skin. Regarding significant relationships between clinical and pathological findings, staining for Ki-67 (p = 0.046) and Apo2.7 (p = 0.037) was more prominent in patients undergoing open versus closed surgery.Conclusion:Using cell proliferation and apoptosis markers, a dense Langerhans cell infiltration was found to occur as a host response to middle-ear cholesteatoma.

scholarly journals Misdiagnosis of hearing loss due to ear canal collapse: a report of two cases

1996 ◽  
Vol 110 (6) ◽  
pp. 561-566 ◽  
Author(s):  
Cliodna F. O Mahoney ◽  
Linda M. Luxon
Keyword(s):  
Hearing Loss ◽  
External Auditory Meatus ◽  
Noise Induced Hearing Loss ◽  
Ear Canal ◽  
True Nature ◽  
High Frequencies ◽  
Hearing Thresholds ◽  
Retrocochlear Pathology

AbstractCollapse of the external auditory meatus during audiometry can lead to spuriously increased hearing thresholds being obtained, particularly at high frequencies, and may simulate conditions such as noise-induced hearing loss, presbyacusis and retrocochlear pathology. Consequently, inappropriate investigations and management may be undertaken. Two patients with elevated thresholds secondary to ear canal collapse are described. The implications of initially failing to identify the true nature of their ‘hearing losses’ are highlighted and strategies to avoid such pitfalls are discussed.

Prophylaxis of Predisposed Otitis Externa

1975 ◽  
Vol 84 (1) ◽  
pp. 16-21 ◽  
Author(s):  
Jimmie L. Hutchison ◽  
D. N. Wright
Keyword(s):  
Otitis Externa ◽  
Bacterial Flora ◽  
Water Repellent ◽  
External Ear ◽  
Ear Canal ◽  
Gram Positive ◽  
Gram Negative ◽  
Ear Canals ◽  
Therapeutic Compounds

Evaluation, in the guinea pig ear, of fourteen water repellent or therapeutic compounds has resulted in the recommended use of 360 Medical Fluid® as a prophylactic agent for those persons with a high risk of otitis externa. This compound was found to adhere well, be easy to apply and was nonirritating. Use of this material prevented adverse bacterial growth in ear canals exposed to water for up to seven days. The significance of maintaining the normal Gram positive bacterial flora in the external ear canal and the role of cerumen in maintaining a healthy meatal surface is discussed. A system for monitoring the health of the ear canal through measurement of the Gram positive/Gram negative bacterial ratio is suggested.

Effect on Hearing Thresholds of Surgical Modification of the External Ear

1977 ◽  
Vol 86 (4) ◽  
pp. 441-450 ◽  
Author(s):  
Richard L. Goode ◽  
Robert Friedrichs ◽  
Stephen Falk
Keyword(s):  
Sound Pressure ◽  
Hearing Threshold ◽  
External Ear ◽  
Ear Canal ◽  
Ear Surgery ◽  
Basic Principles ◽  
Hearing Thresholds

Modifications of external ear anatomy following tympanomastoid surgery can have significant effects on the hearing threshold. Experiments are described that demonstrate the acoustical effect of changes in the dimensions of the concha and ear canal on external ear sound pressure gain. An attempt is made to correlate these findings with results in 30 post-tympanomastoidectomy ears and develop some basic principles of external ear surgery that might be clinically useful.

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