Upper airway obstruction in canine laryngeal paralysis

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Abstract
SUMMARY: The type and the severity of airway obstruction in 30 dogs with bilateral laryngeal paralysis was assessed, using tidal breathing flow-volume loop (tbfvl) analysis. The dogs had clinical evidence of mild-to-severe upper airway obstruction (ie, respiratory distress, exercise intolerance, stridor). Seventeen dogs had tbfvl consistent with a non-fixed (inspiratory) obstruction, 10 had tbfvl indicative of a fixed (inspiratory/expiratory) obstruction, and 3 had normal tbfvl. Analysis of tbfvl confirmed that dogs with laryngeal paralysis have upper airway obstruction that differs in type and severity. Use of tbfvl provided a quantitative evaluation of airway obstruction and demonstrated the effects of bilateral laryngeal paralysis on the breathing patterns of dogs.

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