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|Title:||Effect of head position on radiographic assessment of laryngeal tie-forward procedure in horses|
|Citation:||Veterinary Surgery, 2008; 37(7):608-612|
|Publisher:||W B Saunders Co|
|Laura K. McCluskie, Samantha H. Franklin, J. Geoffrey Lane, W. Henry Tremaine and Katherine J. Allen|
|Abstract:||Objective— To assess the effect of head position on relative position of the larynx and hyoid apparatus in horses with palatal dysfunction, and to define a standard position for radiographic assessment of laryngeal tie-forward. Study Design— Prospective clinical study. Animals— Adult horses (n=9) with palatal dysfunction. Methods— Left lateral radiographs of the larynx were obtained pre and postoperatively for 3 different head positions (flexed=90°; neutral=100°; extended=115°). Distance between thyrohyoid bone and thyroid cartilage was measured. Data were analyzed to investigate differences between head positions, and to compare differences between pre- and postoperative measurements. Results— Head position had a significant effect on relative position of the larynx and hyoid apparatus preoperatively. There was no significant difference in postoperative measurements of the 3 head positions. A significant difference between pre- and postoperative measurements was found with the head in the neutral or extended position whereas there were no significant differences between pre- and postoperative measurements using the flexed position. Conclusions— Head position affects the relationship between the hyoid apparatus and larynx preoperatively, with greatest distance occurring when the head is extended. In a flexed position, it is not possible to ascertain whether laryngeal position has changed postoperatively. Clinical Relevance— A standardized head position is necessary when assessing the laryngeal tie-forward procedure radiographically. An extended head position is most useful for this assessment.|
|Keywords:||Larynx; Palate, Soft; Animals; Horses; Respiratory System Abnormalities; Horse Diseases; Postoperative Care; Preoperative Care; Prospective Studies; Physical Conditioning, Animal; Posture; Female; Male|
|Rights:||© Copyright 2008 by The American College of Veterinary Surgeons|
|Appears in Collections:||Animal and Veterinary Sciences publications|
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