Equine 马喘 (RAO): Chronic Airways Disease in Horses
Heaves is asthma for horses — an allergic lung condition causing cough and breathing difficulty. Management keeps horses working.
复发性气道阻塞（RAO），通常称为气喘或破风，是马的一种慢性过敏性呼吸道疾病。它与人类哮喘类似，会导致气道炎症、支气管痉挛和粘液积聚。通过适当的管理，大多数马匹都能继续运动生涯。
要点
- RAO affects mature horses, usually over 7 years
- The primary trigger is dust and mold in hay and bedding
- Signs include chronic cough, nasal discharge, and increased breathing effort
- The 'heave line' — a visible ridge of abdominal muscles — develops in chronic cases
- Management focuses on dust control; medications treat flare-ups
- Corticosteroids and bronchodilators are the main medical treatments
Understanding RAO
RAO is an allergic, hypersensitivity reaction to inhaled organic dust. The airways become inflamed and constricted. Neutrophils infiltrate the airway walls. Mucus glands overproduce, clogging small airways. Smooth muscle hypertrophy narrows the airway lumen. The result is obstructed airflow, especially during expiration. The disease is progressive if exposure continues. Some horses develop irreversible airway remodeling.
Management & Treatment
Environmental management is the most critical aspect. Replace hay with haylage, silage, or soaked hay. Use low-dust bedding. Avoid straw and shavings from softwood. Stable in well-ventilated areas. Keep horses outside as much as possible. Corticosteroids (dexamethasone, prednisolone, or inhaled beclomethasone/fluticasone via EquineHaler) reduce airway inflammation. Bronchodilators (clenbuterol, albuterol) provide immediate relief during acute episodes.
何时立即去看兽医
- Your horse has a chronic cough at rest and during exercise
- Exercise intolerance is worsening
- There's increased breathing effort with an abdominal push
- A heave line is visible along the flank
- The horse is stabled in a dusty environment with dry hay
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