<unk>  (rarely,<unk> d's sign or<unk> d'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. It is named after Johns Hopkins clinician Louis<unk> , M.D. This sound is heard best over the left lateral position. It has been described as a series of precordial crackles that correlate with the heart beat rather than respiration.
Hamman's sign
Adson's sign
Louvel's sign
Bancroft's sign
Magnan's sign
Dance's sign
Dahl's sign
Salus's sign