Detta arbete beskriver Struppipning, som är en sjukdom som beror på att rekurrensnerven är skadad. Detta leder till att larynx inte kan fungera normalt. Hästens symtom visar sig särskilt vid ansträngning, då den blir onormalt trött, och vid inandning har den ofta ett karakteristiskt missljud. Orsaken till att nervskadan uppstår är ofta idiopatisk, men det kan exempelvis också bero på trauma av olika slag. Det är troligt att sjukdomen är ärftlig.

Dysfunction of the upper respiratory tract is a common cause of impaired performance and intolerance to exercise in racehorses and include several upper airway obstructions. The ones termed dynamic obstructions are primarily seen during physical exertion and affected horses often appear to be normal during endoscope examination at rest. The correlation between diagnoses made at rest respectively exercise is low, suggesting that an examination at rest alone is likely to be insufficient. The upper respiratory tract is exposed to great differences in pressure throughout the respiratory cycle; variations that are further altered during strenuous exercise and affect the rigidity of upper airway structures. In presence of great fluctuations in pressure, stability is achieved through coordinated and synchronous neuromuscular mechanisms. Due to nerve damage or anatomical abnormalities, these functions may be disrupted and further cause a dynamic collapse of the upper respiratory tract when pressure changes become too severe. The etiology behind the neuromuscular dysfunction is not yet fully understood.