Which statement best describes adventitious breath sounds?

• A. Abnormal lung sounds such as rales/crackles and rhonchi heard during auscultation
• B. Normal breath sounds
• C. Heart tones
• D. Absent breath sounds

Answer: (A)

Adventitious breath sounds are abnormal noises heard over the lungs during auscultation, signaling a disturbance such as fluid, secretions, or narrowed airways. The best description is abnormal lung sounds like rales (crackles) and rhonchi heard during auscultation. Crackles occur when small airways pop open after being collapsed or fluid-filled, often seen with edema, pneumonia, or atelectasis. Rhonchi are coarse, snoring-like sounds from secretions in larger airways and can clear with coughing. In contrast, normal breath sounds are expected in healthy lungs, heart tones are auscultated to listen to the heart rather than the lungs, and absent breath sounds are a separate abnormal finding indicating problems like pneumothorax or large airway collapse but do not define adventitious sounds themselves.