The Reliability of Endoscopic Examination in Assessment of Arytenoid Cartilage Movement in Horses Part I: Subjective and Objective Laryngeal Evaluation

Authors

  • R. P. HACKETT dvm, ms, Diplomate acvs,

    Corresponding author
    1. Equine Performance Testing Clinic, Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca, New York
    Search for more papers by this author
  • N. G. DUCHARME dmv, msc, Diplomate acvs,

    1. Equine Performance Testing Clinic, Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca, New York
    Search for more papers by this author
  • S. L. FUBINI dvm, Diplomate, acvs,

    1. Equine Performance Testing Clinic, Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca, New York
    Search for more papers by this author
  • H. N. ERB dvm, PhD

    1. Equine Performance Testing Clinic, Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca, New York
    Search for more papers by this author

DVM, MS, Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca, NY 14853

Abstract

Videorecordings of the laryngeal activity of 108 unsedated horses were obtained at rest by passing a flexible videoendoscope into the nasopharynx through the right ventral meatus. All videotaped images were reviewed once, and 72 were reviewed twice, by three veterinarians. Laryngeal cartilage movement was assessed subjectively with a five-tier grading system. The mean intraobserver agreement was 83.3% (range, 75.0%–90.2%) with a kappa statistic of .65 to .98. The mean interobserver agreement was 79.0% (range, 70.4%–80.6%) with a kappa statistic of .51 to .90. A computer program was developed to measure the leftright ratio of the rima glottidis. The mean left:right ratio for horses assigned a median laryngeal grade of I was 0.84 (range, 0.55–1.03); for grade II, 0.82 (0.50–1.12); for grade III, 0.59 (0.39–0.91); and for grade IV, 0.24 (0.07–0.35).

Ancillary