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Etymology: Gk, aerein + L, pulmoneus, lung, fenestra, window
a congenital anomaly characterized by an abnormal fenestration in the ascending aorta and the pulmonary artery cephalad to the semilunar valve, allowing oxygenated and unoxygenated blood to mix, resulting in a decrease in the oxygen available in the peripheral circulation.
1. the act of perforating or the condition of being perforated.
2. the surgical creation of a new opening in the labyrinth of the ear for the restoration of hearing in otosclerosis.
aortic septal defect.
fenestration heart valves
naturally occurring fenestrations are common in horses and cause development of cardiac murmurs, especially audible in foals. They appear to be congenital and to exert no significant deleterious effect.