The subcutaneous emphysema from swallowing air during vomiting causes a crunching sound, called ____, which is most audible every time the heart beats.

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The crunching sound caused by subcutaneous emphysema from swallowing air during vomiting is called Hamman's crunch. This sound is most audible every time the heart beats. Boerhaave's syndrome is a condition where there is a rupture in the esophagus due to violent vomiting or retching, which can also cause subcutaneous emphysema. Mackler's triad consists of vomiting, lower chest pain, and subcutaneous emphysema and is associated with esophageal perforation. Mallory-Weiss's crunch is not a recognized medical term.

The Subcutaneous Emphysema from Swallowing Air During Vomiting Causes a Crunching