https://m.youtube.com/watch?v=-wBgB_kYrvk
Quincke’s sign, also known as Quincke’s pulse.
Quincke’s sign represents the visualization of capillary pulsations upon light compression applied to the tip of the fingernail bed.
It is a finding associated with chronic severe aortic insufficiency.
Quincke’s sign is one of several signs exhibited in patients with chronic severe aortic insufficiency.