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A pilot study to develop an objective clinical score for canine otitis externa.

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A new canine otitis externa scoring system, the 0-3 Otitis Index Score (OTIS3), shows high reliability and sensitivity. This tool aids in comparing clinical trials for canine ear infections.

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Area of Science:

  • Veterinary Medicine
  • Canine Health
  • Otolaryngology

Background:

  • Clinical trials for canine otitis externa lack a standardized scoring system, hindering comparative analysis.
  • Objective assessment of otitis externa severity is crucial for treatment efficacy and research.

Purpose of the Study:

  • To develop a clinically relevant, reliable, and sensitive scoring system for canine otitis externa.
  • To validate the 0-3 Otitis Index Score (OTIS3) against existing scales and clinical outcomes.

Main Methods:

  • Compared 0-3 and 0-5 assessment scales for ear canal erythema, edema, ulceration, exudate, and pain against a 0-2 reference scale.
  • Evaluated correlation with odor, pruritus, tympanic membrane status, treatment success, and microbial counts in healthy dogs and those with otitis externa.

Main Results:

  • The 0-3 OTIS3 scale demonstrated high correlation with a 0-5 scale and good variability compared to a 0-2 scale.
  • Total scores ≥4 effectively differentiated affected from healthy ears (91.1% sensitivity, 100% specificity).
  • High intra- and interobserver reliability was achieved (ICC >0.95, Cohen's kappa >0.65).

Conclusions:

  • The 0-3 Otitis Index Score (OTIS3) is a promising tool for assessing canine otitis externa.
  • The OTIS3 score is suitable for further validation in larger, multi-center clinical studies.
  • This scoring system has the potential to standardize clinical trial comparisons in veterinary otitis externa research.