## Overview Dynamic nasal collapse is inward collapse of the nasal structures (alar folds or related tissues) during high-speed inspiration. It produces a fluttering noise at the nostrils and can limit performance. External nasal dilator strips may provide temporary relief. Diagnosis requires exercising endoscopy. ## Causes Insufficient rigidity of the alar cartilages or fatigue of the dilator muscles under high negative pressure. ## Diagnosis Exercising endoscopy demonstrating collapse at the nostril level. Resting examination is often normal. ## Treatment Nasal strips (for example, FLAIR strips) can help some horses. Surgical options are limited. Management of concurrent airway inflammation is supportive. ## Recovery and Prognosis Variable. Some horses perform adequately with strips; others remain limited. ## Prevention None specific.
fluttering noise from the nostrils at gallop; exercise intolerance; nostril collapse on inhalation; improvement with nasal strips
## Overview Dynamic nasal collapse is inward collapse of the nasal structures (alar folds or related tissues) during high-speed inspiration. It produces a fluttering noise at the nostrils and can limit performance. External nasal dilator strips may provide temporary relief. Diagnosis requires exercising endoscopy. ## Causes Insufficient rigidity of the alar cartilages or fatigue of the dilator muscles under high negative pressure. ## Diagnosis Exercising endoscopy demonstrating collapse at the nostril level. Resting examination is often normal. ## Treatment Nasal strips (for example, FLAIR strips) can help some horses. Surgical options are limited. Management of concurrent airway inflammation is supportive. ## Recovery and Prognosis Variable. Some horses perform adequately with strips; others remain limited. ## Prevention None specific.
fluttering noise from the nostrils at gallop; exercise intolerance; nostril collapse on inhalation; improvement with nasal strips