Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.
absence of a closed triangular space described by the nails of two index fingers when their distal phalanges are held in dorsal opposition, seen in clubbing.
Schamroth sign(shom′rōt″, roth″)
[Leo Schamroth, 20th-cent. South African cardiologist]
A method of assessing a patient for evidence of clubbing of the fingers. The patient is asked to place the nails of the right and left index fingers against each other. In the healthy, a small diamond-shaped gap is seen between the proximal margin of the nails. In patients with clubbing, this gap is filled by tissue. Clubbing of the digits is found in some patients with serious lung diseases, e.g., lung cancers and chronic obstructive lung disease.