Which term describes bulbous fingertips resulting from chronic hypoxia?

• A. Clubbing
• B. Cyanosis
• C. Hypercarbia
• D. Spontaneous Pneumothorax

Answer: (A)

Bulbous fingertips from long-standing low oxygen levels describe digital clubbing. Chronic hypoxia triggers changes in the soft tissue and bone of the distal digits, leading to a thickened, markedly curved nail bed and a broader, rounded fingertip—often with an increased nail-bed angle. This pattern is commonly seen with long-standing lung or heart diseases that cause persistent hypoxemia, and signs like a loss of the diamond-shaped window when the nail beds are pressed (Schamroth sign) may be noted.

Cyanosis would be a bluish discoloration of the lips and skin from deoxygenated blood, not the shape of the fingertips. Hypercarbia refers to elevated carbon dioxide levels and doesn’t describe finger morphology. Spontaneous pneumothorax is air in the pleural space causing chest symptoms, not a fingertip change.