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Coarse crackles are discontinuous, brief, popping lung sounds. Compared to fine crackles they are louder, lower in pitch and last longer. They have also been described as a bubbling sound. You can simulate this sound by rolling strands of hair between your fingers near your ear.
To distinguish between Ronchi and Crackles (either fine or coarse) have the patient cough. If the condition improves it's ronchi if it stays the same it's crackles. FYI Coarse Crackles is the replacement term for Rales. and Fine Crackles is the replacement term for Crepitations.