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The Behaviors of the Levator Veli Palatine Muscle Between 2 Surgical Conditions in Dog: The Comparison of Furlow and Pushback Methods

Objective: This study was conducted to compare the velopharyngeal function among the beagle dogs which the levator veli palatini (LVP) muscles construction has been experimentally changed. Methods: Four groups of LVP muscle reconstruction were made (normal LVP, cut LVP, end-to-end sutured LVP, and overlapped-sutured LVP at the midline). Levator veli palatini contraction was induced by electrical stimulation or a hypercapnia condition to analyze the strength of the velopharyngeal closure using balloon with a blood pressure meter, and the electromyogram in those operated beagle dogs. Results: Under a hypercapnia condition, the velopharyngeal function did not differ significantly among the 4 groups in the terms of velopharyngeal pressure. The strongest closure was shown at the overlapped sutured LVP group by electrical stimulation. Conclusion: The reconstruction of overlapped sutured LVP showed the most effective closure. This study suggested that the palatoplasty should be conducted along the overlapped LVP (like Furlow method).