Infections of the External Ear

Question 1

3 clinical stages of otitis externa

Answer 1

Preinflammatory, Acute inflammatory, Chronic Inflammatory

Question 2

External ear inflammation that lasts more than 5 weeks in a single episode, or four or more episodes in one ear

Answer 2

Chronic inflammation

Question 3

Edema of the EAC skin and obstruction of the glands from local trauma or moisture

Answer 3

Preinflammatory

Question 4

Mild to severe: erythema and edematous EAC with clear odorless secretions, edema and painmay increase in severity with mucopurulent secretions, worst is EAC becomes obstructed with debris and is intensely painful and associated with periauricular edema and adenopathy

Answer 4

Acute inflammatory

Question 5

External ear infection that spreads to surrounding tissues

Answer 5

Necrotizing OE

Question 6

Approximate length of EAC in cms

Answer 6

2.5 cm

Question 7

Bony and cartilaginous parts?

Answer 7

CARTILAGE 1/3, BONE 2/3 *IAC Bone 1/3, Cartilage 2/3

Question 8

Hydrophobic slightly acidic substance formed by glandular secretions and sloughed epithelium

Answer 8

Cerumen

Question 9

Majority of the osseous EAC is formed by which part of the Temporal Bone?

Answer 9

TYMPANIC PORTION

Question 10

Junction of bony and cartilaginous canal

Answer 10

Isthmus

Question 11

Distinct about bony canal (3)

Answer 11

No subcutaneous layer, no glands, no hair follicles

Question 12

The squamous epithelium of the Bony EAC is _____

Answer 12

Continuous with the lateral TM

Question 13

Defect in the anterior bony canal from incomplete ossification that allows spread of disease to the parotid deep lobe

Answer 13

Foramen of Huschke * Foramen of Santorini is for superficial lobe

Question 14

Normal flora of EAC

Answer 14

Gram positive: Staph, corynebacteria, strep, enterococci * Pseudomonas and funfus are rare in EAC of normal subjects

Question 15

Most common bacterial isolates from AOE (3)

Answer 15

Pseudomonas, Staph epid, Staph aureus