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Hamman's syndrome

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A syndrome of spontaneous subcutaneous emphysema and pneumomediastinum associated with pain. A characteristic symptom is the peculiar sounds bubbling or crunching sounds over the heart synchronous with the cardiac cycle known as Hamman's sign or murmur. Hamman attributed interstitial emphysema to trauma, increased intrapulmonary pressure, or spontaneous rupture of alveoli.


  • L. V. Hamman:
    Spontaneous mediastinal emphysema.
    Bulletin of the Johns Hopkins Hospital, Baltimore, 1939, 64: 1-21. Mediastinal emphysema.
    Journal of the American Medical Association, Chicago, 1945, 128: 1-6.

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