Hamman's sign (rarely, Hammond's sign or Hammond's crunch) is a crunching, rasping sound, synchronous with the heartbeat, heard over the precordium in spontaneous mediastinal emphysema. It is felt to result from the heart beating against air-filled tissues.
Hamman's crunch is caused by pneumomediastinum or pneumopericardium, and is associated with tracheobronchial injury due to trauma, medical procedures (e.g., bronchoscopy) or rupture of a proximal pulmonary bleb. It can be seen with Boerhaave syndrome.
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- "Hamman sign" at Dorland's Medical Dictionary
- synd/3001 at Who Named It?
- McCann], [executive publisher, Judith A. Shilling (2008). Nursing. Ambler, PA: Lippincott Williams & Wilkins. p. 171. ISBN 9781582556680.
- . Chu CP, Chen PP (April 2002). "Tracheobronchial injury secondary to blunt chest trauma: Diagnosis and management". Anaesth Intensive Care. 30 (2): 145–52. PMID 12002920.
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