heaves

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heaves

(hēvz),
A condition of horses similar to chronic obstructive pulmonary disease (e.g., farmer's lung) or airway hypersensitivity (hyperreactivity) syndrome associated with asthma-type conditions in humans; horse serves as a research model. Characterized by inflammation and reduced airway elasticity around the bronchioles and alveoli; and accumulation of inspissated exudates in the small airways, with bronchiectasis, bronchospasms, smooth muscle hypertrophy and fibrosis. It reduces pulmonary function. Clinical signs include coughing, bronchitis, bronchiolitis, reduces exercise tolerance, and expiratory dyspnea that, in chronic cases, leads to a heave line on the musculature located superficially on the caudovental aspect of the abdomen.
Synonym(s): broken wind

heaves

[hēvz]
Etymology: AS, hebban, to lift
1 a chronic pulmonary disease, similar to human pulmonary emphysema, characterized by wheezing, coughing, and dyspnea on exertion. The cause of the condition is unknown.
2
Usage notes: (informal)
vomiting and retching.

heaves

see chronic obstructive pulmonary disease.

heaves line
the visible groove between the aponeurotic and muscular parts of the external oblique muscle caused by the persistent double expiratory effort, with maximum abdominal muscle input, imposed by the poor respiratory gas exchange in this disease.
Enlarge picture
Heave line in a horse with chronic obstructive pulmonary disease. By permission from Knottenbelt DC, Pascoe RR, Diseases and Disorders of the Horse, Saunders, 2003