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At least 235 records · Page 13Linked to original sources
PubMed1990

Surgical treatment of obliterative otitis externa.

Seven patients with fibrous obliteration of the ear canal due to long-standing otitis externa were seen at St Mary's Hospital during the past 10 years. Two patients underwent bilateral surgery making a total of 9 ear cases. Two patients developed early restenosis within 6 months of permeatal excision of the fibrous core and skin grafting, and one patient had late stenosis 4 years following postaural excision, meatoplasty and skin grafting. Two of these patients opted for revision surgery and a total of 6 patients (8 ear cases) underwent postaural excision with Körner flap canalplasty, enlargement of the bony ear canal and skin grafting. The average hearing gain was 25 dB in the speech frequencies and only one restenosis was seen at 3 years. This was successfully revised. Radical excisional surgery with a wide bony canalplasty is recommended in this condition.

Adult↗
PubMed2005

Tea tree oil: in vitro efficacy in otitis externa.

OBJECTIVE: The purpose of this study was to determine the susceptibility of organisms causing otitis externa (OE) to the essential oil of Melaleuca alternifolia, or tea tree oil (TTO). METHODS: Fifty-seven swabs were taken from the ears of 52 patients with OE for culture and sensitivity. A broth microdilution method was used to determine the minimum inhibitory concentration (MIC) of TTO for each organism. RESULTS: In 51 percent of the swabs taken, pathogenic organisms were cultured. Of these cultures 71 percent, both bacteria and yeast, were susceptible to TTO 2 percent or less. The only organism showing resistance to TTO was Pseudomonas aeruginosa; however 25 percent of these bacteria were sensitive. CONCLUSION: Tea tree oil may have a role to play in the treatment of OE. However, more work needs to be done to enhance the anti-pseudomonal effect and to assess ototoxicity.

Adolescent↗
PubMed2001

Attachment of Malassezia pachydermatis to the ear dermal cells in canine otitis externa.

To investigate the predominance of Malassezia pachydermatis (M. pachydermatis) as a causative agent of canine otitis externa, ear cerumen samples were observed for adhesion of M. pachydermatis to the cornified epithelial cells by light and electron microscopes. The yeasts appeared not to adhere to the cornified epithelial cells directly, but they seemed to exist in the proximity of the epithelial cells with an electron opaque halo-like space around them. Polysaccharide and lipid staining techniques were conducted to identify the substances existing in that space. Lipid substances, not saccharides, were observed around the yeasts and the cornified epithelial cells. These results suggested that in the canine ear canal malassezia yeast attachment to the cornified epithelial cells is mediated by lipids.

Animals↗
PubMed1984

Middle-ear pressure changes in relation to recurrent otitis externa.

Middle-ear pressure was estimated in 28 patients who suffered from recurrent attacks of bacterial otitis externa, but without systemic disease. The middle-ear pressure was found to be normal in seven cases, mildly negative in 15 cases, and severely reduced in six cases. Restoration of the middle-ear pressure greatly improved the condition of the external ear in most cases.

Acoustic Impedance Tests↗
PubMedDate not supplied

Characteristics of Malassezia pachydermatis strains isolated from canine otitis externa.

The morphological, cultural and biochemical characteristics of 80 M. pachydermatis strains isolated from cases of canine otitis externa were studied. Microscopically, the strains could be subdivided into two phenotypes. All M. pachydermatis strains grew well on Sabouraud glucose, yeast morphology and modified malt extract agar, but formed two distinct colony types. All strains were characterized by no fermentation. Assimilation of glucose, mannitol (42 strains), sorbitol (40 strains) and peptone was observed, but no ethanol assimilation. Urease and catalase tests were positive, while indole and acetoin production was not detected. All strains showed proteinase, caseinase, lecithinase and peroxidase positivity but to varying extents. Esterase activity was observed for all Malassezia strains when using Tween 20, 40 and 60, whereas Tween 80 was hydrolysed by only 42 strains. No coagulase or haemagglutinating activities were detected. When compared for satellite phenomenon and vitamin requirements, some Malassezia strains could not grow in the absence of nicotinic acid but grew well in the presence of staphylococci. In susceptibility tests, all strains showed the highest susceptibility to ketoconazole. On the basis of the biochemical differences, M. pachydermatis seems to be a heterogeneous species and can be divided into two groups.

Animals↗
PubMed1988

Preliminary studies on the mechanism of infection and characterization of Malassezia pachydermatis in association with canine otitis externa.

A study on the mechanism of infection and the characterization of Malassezia pachydermatis in connection with canine otitis externa was conducted. The ability of this yeast to grow uninhibited in intimate contact with the diversity of other microbial isolants of the canine aural canal was demonstrated. Canine cerumen seemed to promote the growth of this yeast. Although the source of infection is still obscure, M. pachydermatis managed to survive in soil and dust at different temperatures for four weeks. Among the commonly used diagnostic media, Sabouraud's dextrose agar was shown to be the most supportive for the growth of this yeast.

Animals↗
PubMed2000

Atypical lipid-dependent Malassezia species isolated from dogs with otitis externa.

During a survey of the occurrence of Malassezia species in the external ear canals of dogs with chronic otitis externa, lipid-dependent Malassezia species were isolated in three dogs. These species were identified as Malassezia furfur and M. obtusa but showed atypical assimilation patterns. To our knowledge, this is the first report of the isolation of lipid-dependent species of the genus Malassezia in association with canine otitis.

Animals↗
PubMed1981

A comparison of the treatment of otitis externa with 'Otosporin' and aluminium acetate: a report from a services practice in Cyprus.

We studied 126 cases of otitis externa among the population of a British forces base in Cyprus during one season. The causes of infection, the infective agents involved and the treatment of the observed cases in general practice are discussed. The patients were treated with either antibiotic/steroid ear drops (;Otosporin') or with aluminium acetate ear drops. We found no significant difference between the two.

Acetates↗
PubMed2006

Update on antimicrobial susceptibilities of bacterial isolates from canine and feline otitis externa.

The in vitro susceptibility of a total of 1819 bacterial isolates from canine and 103 isolates from feline otitis externa cases to 13 antimicrobial drugs over a 5-year period was evaluated. Among topically used drugs, 90% of isolates were susceptible to gentamicin. Susceptibility of Pseudomonas aeruginosa to gentamicin was 85%, and to polymyxin B 100%. For isolates other than the Pseudomonas sp., susceptibility was highest to amoxicillin-clavulanic acid.

Animals↗