Quincke Sign

Excerpt

The Quincke sign, also known as the Quincke pulse, represents the visualization of capillary pulsations upon light compression applied to the tip of the fingernail bed. It is an eponym associated with chronic severe aortic regurgitation. On physical examination, a patient exhibiting this sign will have an alternating reddening and blanching of the nailbed with each pulsation. This sign can be further enhanced with the use of illumination. In addition to this sign on the nailbed, a Quincke sign has also been reported to occur on a Janeway lesion in a patient with infective endocarditis.