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Crackles are the clicking, rattling, or crackling noises that may be made by one or both lungs of a human with a respiratory disease during inhalation, and occasionally during exhalation. They are usually heard only with a stethoscope ("on auscultation ").
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]
It is performed by asking the patient to exhale and hold it. The doctor then percusses down their back in the intercostal margins (bone will be dull), starting below the scapula, until sounds change from resonant to dull (lungs are resonant, solid organs should be dull). That is where the provider marks the spot.
The residual volume, the volume of air left in the lungs following full expiration, is often increased in COPD, as is the total lung capacity, while the vital capacity remains relatively normal. The increased total lung capacity (hyperinflation) can result in the clinical feature of a barrel chest – a chest with a large front-to-back diameter ...
Inhalation begins with the contraction of the muscles attached to the rib cage; this causes an expansion in the chest cavity. Then takes place the onset of contraction of the thoracic diaphragm, which results in expansion of the intrapleural space and an increase in negative pressure according to Boyle's law. This negative pressure generates ...
Kamath says it can cause intermittent chest pain or sharp, tearing chest pain that often radiates to the shoulders and the back. It more often happens to men between the ages of 60 and 80.
Techniques include chest percussion using clapping: the therapist lightly claps the patient's chest, back, and area under the arms. Percussion, while effective in the treatment of infants and children, is no longer used in adults due to the introduction of more effective and self-management focused treatments.
Yogis such as B. K. S. Iyengar advocate both inhaling and exhaling through the nose in the practice of yoga, rather than inhaling through the nose and exhaling through the mouth. [16] [17] [18] They tell their students that the "nose is for breathing, the mouth is for eating." [17] [19] [20] [16]