![]() ![]() Stridor is a high-pitched, wheezing sound that’s usually heard on inspiration. Rhonchi are caused by blockage in the large airways due to fluid, mucus, or other secretions in the lungs. Rhonchi are low-pitched rattling sounds that may sound like snoring, gurgling, or wheezing. What causes crackles?Ĭrackles are caused by fluid in the smaller areas of the lungs such as in the alveoli. What do crackles sound like?Ĭrackles are described as bubbling, popping, or clicking noises that are best heard during inhalation and may be moist, dry, fine, or coarse. Wheezing is caused by vibrations of constricted airway walls induced by a diminished airflow. Wheezing is a high-pitched whistling sound that is commonly heard with expiration and may be heard with inspiration or throughout the cycle depending on the severity of inflammation and constriction.
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