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.
Normal breath sounds are not usually heard when a person breathes. Instead, they are heard using a medical instrument called a stethoscope. A normal breath sound is similar to the sound of air. A doctor can hear normal breath sounds by placing the stethoscope on your chest, back, collarbone, and ribcage. A stethoscope can also pick up abnormal breathing sounds. These sounds are described as: 1  rhonchi (snoring sounds). 2  rales (clicking, rattling, bubbling).