2.2 Rhonchi
– Also known as sonorous wheezes
– Continuous, low‐pitched, rumbling sounds usually
heard on expiration
– Do not involve small airways
– Less discrete than crackles and are auscultated easily
– Caused by passage of air through airway obstructed
by thick secretions, muscular spasm, new tissue
growth, or external pressure collapsing the airway
lumen
– May result from any condition that increases secretions