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.
Abnormal breathing sounds heard during. inhalation or expiration, with or without a. stethoscope. CRACKLES. ï±. Fine crackling or bubbling sounds, commonly. heard during inspiration when there is fluid in. the alveoli; also called rales. ï. Crackles are commonly associated with bronchitis, pneumonia, and heart failure (HF).