Description
Abnormal enlargement at the base of the fingernails with "loss of the normal angle at the nail bed." [Merck Manual, p. 364] "Clubbing is a classic sign of chronic hypoxemia in patients with chronic obstructive lung disease." [Primary Care Medicine, 3rd ed. Goroll AH, et al. J.B Lippincott Company, Philadelphia, 1995, p. 248]