Britannica
Sources used in this answer
How does auscultation allow a doctor to examine the heart and lungs?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
diagnosis
Magnetic resonance imaging (MRI) is a powerful diagnostic technique that is used to visualize organs and structures inside the body without the need for X-rays or other radiation.
Auscultation is a diagnostic procedure where a physician uses a stethoscope to listen to internal body sounds to detect medical conditions.12
Examining the Heart
Cardiac auscultation evaluates sounds produced by the heart valves. Normal heart sounds occur when these valves close; however, valve obstruction or imperfect closure creates turbulent blood flow, resulting in audible, prolonged noises known as murmurs. Doctors analyze these murmurs based on their timing, intensity, pitch, and quality to identify specific valve deformities or heart muscle weakness.12
Examining the Lungs
Auscultation allows doctors to monitor air movement within the lungs. Beyond normal breathing sounds, physicians listen for adventitious sounds that indicate disease:2
- Crackles (rales): Suggest fluid in small passageways, often linked to pneumonia or congestive heart failure.2
- Wheezes: Musical sounds indicating rapid airflow through partially obstructed airways, common in asthma or bronchitis.2
- Pleural rubs: Sounds like creaking leather, caused by inflamed pleural surfaces rubbing together.2