Stridor, also known as wheezing, is a breathing sound which is caused by a narrowing of the respiratory tracts. It may be a whistling or hissing sound. Normally, unhindered breathing is silent. Audible air turbulence occurs when there is an obstacle in the respiratory tracts.
Crackles Also Known as Rales What do crackles sound like? Roll your hair between your fingers next to your ear.. That's what fine crackles sound like! Or the sound of salt heated on a frying pan, if you've ever tried cooking :P Coarse crackles sound like ripping open Velcro. When are crackles heard?
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