Repetition Training - Basic Lung Sounds Crackles - Fine (Rales) Lesson Waveform Anatomy play pause Table of Contents 1Crackles - Fine (Rales) 2Crackles - Coarse (Rales) 3Wheeze 4Rhonchi - Low Pitched Wheezes 5Bronchial 6Pleural Rubs Practice Quiz This video is an animation of Crackles - Fine (Rales) A#421 (lesson# 1) within course number 1. Fine crackles are brief, discontinuous, popping lung sounds that are high-pitched. Fine crackles are also similar to the sound of wood burning in a fireplace, or hook and loop fasteners being pulled apart or cellophane being crumpled. Crackles, previously termed rales, can be heard in both phases of respiration. Early inspiratory and expiratory crackles are the hallmark of chronic bronchitis. Late inspiratory crackles may mean pneumonia, CHF, or atelectasis.