Respiratory sounds

There are at least three kind of respiratory sound

It is a low-pitched sound that usually starts in the larger airways in the lungs.
It can be heard on an inhalation or exhalation, and it’s often compared to the sound of snoring.
These sounds are produced when there is something blocking the airway, like fluid.

Rales are a higher-pitched sound sometimes called crackles or bibasilar crackles.
These sounds are formed when air moves into closed spaces. This usually occurs in the smaller parts of the lungs, like the alveoli.
These are tiny sacs of air and inflate and deflate with each breath. When these tiny sacs are damaged or weighed down with fluid or mucus, they can make a crackling sound as they attempt to fill with air.

It is a high-pitched extra-thoracic breath sound resulting from turbulent air flow in the larynx or lower in the bronchial tree.
It is a physical sign which is caused by a narrowed or obstructed airway.
It can be inspiratory, expiratory or biphasic, although it is usually heard during inspiration.
Inspiratory stridor often occurs in children with croup.
It may be indicative of
- Epiglottitis or Subglottic stenosis
- Foreign body lodged in the airway
- Laryngeal tumor
- Laryngospasm (from Aspiration, GERD)
- Thyroiditis such as Riedel's thyroiditis
- Vocal cord palsy
- Vasculitis
- Infectious mononucleosis

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