(os′tĭn-flint′ )
[Austin Flint, Sr., U.S. physician, 1812-1886]
A presystolic or late diastolic heart murmur best heard at the apex of the heart. It is present in some cases of aortic insufficiency. It is thought to be due to the vibration of the mitral valve caused by the backward-flowing blood from the aorta meeting the blood flowing in from the left atrium.