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19 Cards in this Set
- Front
- Back
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T or F:
Most aural hematomas are self-inflicted. |
True!
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What structures form the external ear canal?
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Auricular and scutiform cartilages
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What scrub solution should be used when cleaning the ear pinna for surgery?
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Betadine (chlorhex is toxic to the cornea)
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When suturing an aural hematoma, how should your sutures be oriented and why?
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Vertical; prevents vascular occlusion
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Where is aural neoplasia most common?
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Central convex surface
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What is the most common bacteria causing otitis externa? Yeast?
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Staph. intermedius;
Malassezia |
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What are treatment options for end stage otitis externa?
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Really only one - TECA (total ear canal ablation)
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T or F:
TECA is always combined with a LBO. |
True!
TECA (total ear canal ablation) LBO (lateral bulla osteotomy) |
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When performing a LBO, what structures must be avoided? What tissue must be definitively removed?
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Avoid facial n., vestibulochoclear apparatus, retroarticular vein
Make sure to remove epithelial lining of the bulla |
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What are the most common malignancies of the ear?
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Ceruminous gland adenocarcinoma
SCC Carcinomas of undetermined origin |
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What are the most common benign tumors of the ear?
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Inflammatory polyps
papillomas ceruminous gland adenomas basal cell tumors |
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How does cat and dog middle ear anatomy differ?
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Middle ear of cat separated into 2 chambers by a bony shelf; also more cilia and secretory cells than dogs
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In dogs with otitis media, bacteria usually enters via the ____________________ while in cats it enters via the __________________.
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Dogs (external acoustic meatus)
Cats (nasopharynx and eustacean tubes) |
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What is the tissue origin of middle ear polyps and how is it treated? Which species does this occur in?
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Typmanic epithelium of cats; treated with traction (pull the sucka out)
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What are indications for a ventral bulla osteotomy?
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middle ear disease without external ear involvement
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T or F:
Horner's syndrome is a common sequel to a lateral bulla osteotomy. |
False!
Horner's is a sequal to a VENTRAL bulla osteotomy |
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What are the signs of Horner's syndrome?
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Enopthalmos
Ptosis (droopy eye) Miosis (pupillary constriction) |
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T or F:
Neoplasia in the middle ear is nearly always an extension of external ear canal tumors. |
True!
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What happens when ear canal epithelium gets trapped within the middle ear?
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Aural cholesteatoma
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