inspiratory dyspnea
Etymology: L, inspirare, to breathe in; Gk, dys, without, pnoia, breath
a form of breathing difficulty caused by an obstruction in the larynx, trachea, or bronchi. The patient attempts to compensate for this deficiency with prolonged, deep inspirations.
dyspnea
labored or difficult breathing; a sign of a variety of disorders and is primarily an indication of inadequate ventilation, or of insufficient amounts of oxygen in the circulating blood. 
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Severe respiratory distress in a cow with atypicalpneumonia. By permission from Blowey RW, WeaverAD, Diseases and Disorders of Cattle, Mosby, 1997
expiratory dyspnea
the dyspnea is primary during the expiratory phase of respiration. Usually associated with lower airway obstruction.
inspiratory dyspnea
the dyspnea is primarily during the inspiratory phase of respiration. Usually associated with upper airway obstructions and sometimes disorders of the pleura.
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