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Fine crackles are soft, high-pitched, and very brief. This sound can be simulated by rolling a strand of hair between one's fingers near the ears or by moistening one's thumb and index finger and separating them near the ears. Their presence usually indicates an interstitial process, such as pulmonary fibrosis or congestive heart failure.
Respiratory sounds, also known as lung sounds or breath sounds, are the specific sounds generated by the movement of air through the respiratory system. [1] These may be easily audible or identified through auscultation of the respiratory system through the lung fields with a stethoscope as well as from the spectral characteristics of lung sounds. [2]
Chest X-rays may show air in the mediastinum, the middle of the chest cavity. [5] A significant case of subcutaneous emphysema can be detected by touching the overlying skin, which will feel like tissue paper or Rice Krispies. [8] Touching the bubbles causes them to move and sometimes make a crackling noise. [9]
The cracking sound comes from tiny air bubbles within the synovial fluid—the lubricating fluid surrounding the joints—popping from pressure changes during the bending or stretching of the joints.
Air can also be trapped in the mediastinum, the center of the chest cavity (pneumomediastinum). [4] If air escapes from a penetrating injury to the neck, a definite diagnosis of TBI can be made. [10] Hamman's sign, a sound of crackling that occurs in time with the heartbeat, may also accompany TBI. [14]
Researchers said on Wednesday they have settled the issue of what occurs inside knuckles to trigger the familiar popping sound. Snap, crackle, pop: study reveals secret behind knuckle-cracking ...
[8] [9] With more severe contusions, breath sounds heard through a stethoscope may be decreased, or rales (an abnormal crackling sound in the chest accompanying breathing) may be present. [6] [10] People with severe contusions may have bronchorrhea (the production of watery sputum). [11] Wheezing and coughing are other signs. [12]
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