Content continues after advertisement

Scoring Otitis Externa

Clinician's Brief (Capsule)

Dermatology

|August 2016

Sign in to Print/View PDF

Canine otitis externa is among the most common medical problems in dogs. Lack of an accepted, uniform scoring system of disease severity makes it difficult to compare published clinical trials. 

This pilot study aimed to develop and assess an objective clinical scoring system. The Otitis Index Scores (OTIS) assessed severity and response to treatment and used 0-3 (OTIS3) and 0-5 (OTIS5) scales for assessment of erythema, edema/swelling, erosions/ulcerations, exudate, and pain. These were compared with the US2 clinical scoring system, which is used by the US Food and Drug Administration when assessing veterinary products for regulatory purposes. Other data assessed included odor, owner-perceived pain, abnormal tympanic membrane, treatment outcome, and otitis type. 

The OTIS3 and OTIS5 scales had high correlation, but the OTIS3 scale was marginally superior and easier to use. The US2 scale was highly variable. Pain and pruritus did not correlate well with lesion scores. Neutrophil and microbial counts were variable and could not be used to generate cutoff points to differentiate healthy and affected ears or assess response to therapy. The authors recommended assessing the 0-3 OTIS3 for erythema, edema/swelling, erosions/ulcerations, and exudate for further validation. Funded in part by Novartis Animal Health

Commentary

When comparing otitis externa treatment recommendations and evaluating efficacy of new medications, having a tool for objective clinical measurement is helpful. The OTIS validated in this paper evaluates erythema, edema/swelling, erosions/ulcers, and exudate of the external ear canal. Interestingly, the OTIS3 clinical assessments for the parameters of pain and pruritus level, odor, evaluation of the tympanic membrane, and cytology results did not necessarily differentiate a healthy ear from an affected ear or determine if an affected ear would have a successful clinical outcome. That does not mean that those parameters are not important; they are all significant when treating a patient and determining the underlying cause of infection. However, the 4 included criteria had acceptable reliability for evaluation of clinical outcome and will likely be used in future clinical research.—Darcie Kunder, VMD

References

For global readers, a calculator to convert laboratory values, dosages, and other measurements to SI units can be found here.

All Clinician's Brief content is reviewed for accuracy at the time of publication. Previously published content may not reflect recent developments in research and practice.

Material from Clinician's Brief may not be reproduced, distributed, or used in whole or in part without prior permission of Educational Concepts, LLC. For questions or inquiries please contact us.

Podcasts

Clinician's Brief:
The Podcast
Listen as host Alyssa Watson, DVM, talks with the authors of your favorite Clinician’s Brief articles. Dig deeper and explore the conversations behind the content here.
Clinician's Brief provides relevant diagnostic and treatment information for small animal practitioners. It has been ranked the #1 most essential publication by small animal veterinarians for 9 years.*

*2007-2017 PERQ and Essential Media Studies

© 2023 Educational Concepts, L.L.C. dba Brief Media ™ All Rights Reserved. Terms & Conditions | DMCA Copyright | Privacy Policy | Acceptable Use Policy