For heart sounds listen to the synthetic sound while reviewing this lesson.
Fine crackles (rales) are brief, discontinuous, popping sounds that are high-pitched. You can simulate this lung sound by rolling strands of hair between your fingers near your ear. Fine crackles are also similar to wood burning in a fireplace.
Crackles are more commonly heard during breath inspiration. These crackles can be heard over a wide area of the chest.