A healthy heart typically makes two distinct sounds: "lub-dub". These sounds are created by the closing of the heart valves. The "lub" is the sound of the atrioventricular valves (mitral and tricuspid) closing at the start of ventricular contraction (systole), while the "dub" is the sound of the semilunar valves (aortic and pulmonic) closing at the end of systole. These are high-pitched sounds, easily audible with a stethoscope. [10-Aug-2022 Reference]
Beyond "Lub-Dub": Additional Heart Sounds
While the "lub-dub" sound is the most common and characteristic of a healthy heart, there can be additional sounds. These are often quieter and lower pitched. [10-Aug-2022 Reference]
- Third and Fourth Heart Sounds: These less prominent sounds can sometimes be heard, and if present, might suggest potential heart function issues. [10-Aug-2022 Reference, Medicalnewstoday.com Reference] These are typically low pitched. [10-Aug-2022 Reference]
- Heart Murmurs: These are extra or unusual sounds, described as whooshing or swishing noises. They result from turbulent blood flow within the heart, often due to valve problems or other structural issues. [Mayo Clinic Reference, Better Health Channel Reference, BHF Reference]
Listening to Your Heart
The classic tool used to evaluate heart sounds is a stethoscope. [StatPearls Reference] A medical professional can use this tool to listen for normal "lub-dub" sounds as well as any additional sounds that may indicate a condition requiring further investigation. [Medicalnewstoday.com Reference, StatPearls Reference]
Videos such as the one from MEDZCOOL on YouTube illustrate normal heart sounds (S1 and S2). [MEDZCOOL YouTube Reference]
Important Note:
This information is for general knowledge and should not be considered medical advice. If you have concerns about your heart sounds, consult a healthcare professional for a proper diagnosis.
