Summary
Otitis externa/media is commonly found in dogs with chronic ear diseases and in cats with upper respiratory disease and polyps. Diagnosis of otitis media requires attention to history and clinical signs, but it also requires other methods of determining disease within the bulla.
If the integrity of the eardrum cannot be determined, assume that there is middle ear disease and proceed accordingly. It is prudent to take necessary precautions to avoid the use of potentially ototoxic ear cleaners or topical medications in suspected otitis media cases. Therapeutic success is possible using systemic and topical treatment within the cleaned bulla. Referral to a dermatology specialist or a radiologist for CT scan may be indicated in some refractory cases. Surgical intervention may be required to cure these difficult cases.References
1. Little CJL, Lane JG, Pearson GR: Inflammatory middle ear disease of the dog: the pathology of otitis media, Vet Rec 128:293-296, 1991.
2. Cole LK, Kwochka KW, Kowalski JJ, et al: Microbial flora and sensitivity patterns of isolated pathogens from the horizontal ear canal and middle ear in dogs with otitis media, JAVMA 212(4): 534-548, 1998.
3. Kern TJ, Erb HN: Facial neuropathy in dogs and cats: 95 cases (1975-1985), JAVMA 191(12):1604- 1609, 1987.
4. Little CJL, Lane JG: An evaluation of tympanometry, otoscopy, and palpation for assessment of the canine tympanic membrane, Vet Rec 124:5-8, 1989.
5. Tower ND, Gregory SP, Renfrew H, et al: Evaluation of the canine tympanic membrane by positive contrast ear canalography, Vet Rec 142(4):78-81, 1998.
6. Walz PH, Mullaney TP, Redner JA, et al: Otitis media in pre-weaned Holstein dairy calves in Michigan due to Mycoplasma bovis, J Vet Diagn Invest 9(3):250-254, 1997.
7. Trevor PB, Martin RA: Tympanic bulla osteotomy for treatment of middle ear diseases in cats, JAVMA 202(1):123-128, 1993.
8. Gotthelf LN: Otitis media. In Gotthelf LN, ed: Small animal ear diseases: an illustrated guide, Philadelphia, 2000, Saunders.
9. Jordan DG: Azithromycin, Comp Cont Ed Vet Pract Vet 21(3):242, 2001.
10. MedScape Today: Antibiotic resistance varies with underlying biologic mechanism, www.medscape. com/viewarticle/417558_3.
11. Foster AP, DeBoer DJ: The role of Pseudomonas in canine ear disease, Comp Cont Ed 20(8):909-918, 1998.
12. Faulkner JE, Budsberg SC: Results of ventral bulla osteotomy for treatment of middle ear polyps in cats, JAAHA 26(5):496-499, 1990.
13. Colombini S, Merchant SR, Hosgood G: Microbial flora and antimicrobial susceptible patterns from dogs with otitis media, Vet Dermatol 11:235-239, 2000.
14. Martin Barrasa JL, Lupiola JL, Gomez P, et al: Antibacterial susceptibility patterns of Pseudomonas strains insolated from chronic canine otitis externa, J Vet Med B Infect Dis Vet Public Health 47(3):191-196, 2000.
15. Mansfield PD, Miller SC: Ototoxicity of topical preparations. In Gotthelf LN, ed: Small animal ear diseases: an illustrated guide, Philadelphia, 2000, Saunders.
16. Dohar JE, et al: Treatment of chronic suppurative otitis media with topical ciprofloxacin, Ann Otot Rhinol Laryngol 107(10, Pt 1):865-871, 1998.
17. Ihrke PJ, Paqpich MG, DeManuelle TC: The use of fluoroquinolones in veterinary dermatology, Vet Dermatol 10:193-204, 1999.
18. Parry D, et al: Middle ear, chronic suppurative otitis, medical treatment, http:/www.e-medicine.com/ ent/topic214.htm, April 18, 2002.
Suggested Readings
Anderson DM, Robinson RK, White RAS: Management of inflammatory polyps in 37 cats, Vet Rec 147:684-687, 2000.
Dunn CJ, Barradell LB: Azithromycin. A review of its pharmacological properties and use as 3 day therapy in respiratory tract infections, Drugs 51(3):483-505, 1996.
Nuttall TJ: Use of ticarcillin in the management of canine otitis externa complicated by Pseudomonas aeruginosa, J Sm Anim Pract 39(4):165-168, 1998.
Schachern PA, et al: The permeability of the round window membrane during otitis media, Arch Otolaryngol Head Neck Surg 113(6):625-629, 1987.
Stanley BJ: Management of nasopharyngeal polyps in cats, Walham Feline Medicine Symposium, North American Veterinary Conference, January 14, 1998.
Tos M, Wiederhold M, Larsen P: Experimental long term tubal occlusion in cats. A quantitative histopathological study, Acta Otolaryngol 97(5-6):580-592, 1984.
VanHeerbeek N, et al: Effect of exogenous surfactant on ventilatory and clearance function of the rat’s eustachian tube, Otol Neurotol 24(1):6-10, 2003.
Veir JK, Lappin MR, Foley JE, et al: Feline inflammatory polyps: historical, clinical and PCR findings for feline calici virus and feline herpes virus—1 in 28 cases, J Feline Med Surg 4(4):95-199, 2002.