Repetition Training - Basic Lung Sounds Wheeze Lesson Waveform Anatomy play pause Table of Contents 1Crackles - Fine (Rales) 2Crackles - Coarse (Rales) 3Wheeze 4Rhonchi - Low Pitched Wheezes 5Bronchial 6Pleural Rubs Quiz This video is an animation of Wheeze A#421 (lesson# 3) within course number 3. Wheezes are adventitious lung sounds that are continuous with a musical quality. Wheezes can be high or low pitched. High pitched wheezes may have an auscultation sound similar to squeaking. Lower pitched wheezes have a snoring or moaning quality. The proportion of the respiratory cycle occupied by the wheeze roughly corresponds to the degree of airway obstruction.Wheezes are caused by narrowing of the airways.