Auscultation abnormalities over lungs- pathologic sounds

Rhonci and wheezes- come from bronchi as a result of their obturation due to oedema and mucus overproduction, usually present on expiration Crepitations, crackles – audible when air comes back into atelectatic vessicles (atelectasis, inflammation) best heard at the top of inspiration, typical for pneumonia Pleural friction- best heard at the end of inspiration and the beginning of expiration in pleuritis without exudate.