Digital Clubbing: A Sign of Underlying Disease Author: Bernard Karnath, MD
	1. Which one of the following describes the obliteration of the diamond-shaped window that normally occurs when the dorsal surfaces of the terminal phalanges are placed together, thereby suggesting clubbing? Blumberg’s sign Lachman’s sign Murphy’s sign Schamroth’s sign Click here to compare your answer. 2. The digital index, used to determine the presence of clubbing, is calculated by measuring the ratios of the circumferences on each of the 10 fingers at which of the following pairs of locations? Distal interphalangeal joint and proximal interphalangeal joint Nail bed and distal interphalangeal joint Nail bed and proximal interphalangeal joint Proximal interphalangeal joint and metacarpophalangeal joint Click here to compare your answer.		3. The phalangeal depth ratio is determined by measuring the distal phalangeal depth at the nail bed and distal interphalangeal joint depth. To be indicative of clubbing, the phalangeal depth ratio should exceed which minimum value? 0.5 1.0 1.5 2.0 Click here to compare your answer. 4. A patient with chronic obstructive pulmonary disease (COPD) exhibits digital clubbing. Which one of the following diagnostic evaluations should be performed? Chest radiograph Measurement of hepatocyte-growth factor (HGF) levels Measurement of platelet-derived growth factor (PDGF) levels Pulmonary function testing Click here to compare your answer.
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