It's not until after she dies that Scout and Jem get a sense of what's going on behind the drool and venom: Mrs. Dubose is a morphine addict who had vowed to go clean before she died, and enlisted Jem and Scout (without their knowledge) to keep her off the stuff for longer and longer periods of time.
http://lungsounds.net/rales-lung-sounds/ - Rales lung sounds are small rattling noises heard around the lung. This happens when air exposes closed air spaces. Rales can be shown as wet, dry and coarse.
What Are Bronchial Breath Sounds? Bronchial breath sounds are tubular, hollow sounds which are heard when auscultating over the large airways (e.g. second and third intercostal spaces). They will be louder and higher-pitched than vesicular breath sounds. Bronchial vs Vesicular