In healthy adults, there are two normal heart sounds, often described as a lub and a dub that occur in sequence with each heartbeat. These are the first heart sound (S 1) and second heart sound (S 2), …

The two major heart sounds are “lub” (from the closure of AV valves) and “dub: (from the closure of aortic and pulmonary valves).

If you put a stethoscope over the chest, you’ll usually hear something that sounds like lub dub, lub dub, lub dub, which repeats over and over again, with each cardiac cycle, or heartbeat.

Jul 19, 2025 · Explore the mechanics behind the heart’s familiar lub-dub. Learn how variations like murmurs or gallops can indicate changes in heart function and structure.

In a healthy adult, the heart makes two sounds, commonly described as ‘lub’ and ‘dub.’ The third and fourth sounds may be heard in some healthy people, but can indicate impairment of the heart function.

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Ever wonder why the heart sounds the way that it does? Opening and closing of heart valves makes the heart rhythm come alive with its lub dub beats... Rishi is a pediatric infectious disease physician and …

Aug 21, 2025 · Understanding heart sounds is fundamental to diagnosing a wide range of cardiovascular conditions. The familiar "lub dub" we hear through a stethoscope represents the coordinated closing …

But what is responsible for its distinctive sound? You know the one: lub-dub, lub-dub, lub-dub. Most of us think it's the sound of our heart beating or contracting, but it's not. What we're hearing is the …

The lub-dub heart sound is caused by the closing of heart valves during the cardiac cycle. The “lub” occurs when the mitral and tricuspid valves close at the start of ventricular contraction, while the …