The lub is slightly lower pitched and longer than the dub. That’s why you hear them as two distinct notes — not one single thump.
Heart sounds are created by the closing of these valves. When the valves shut, they produce a series of sounds that can be heard with a stethoscope. There are two main heart sounds: S1 (the first heart sound) and S2 (the second heart sound). heart sound lub dub
Listening to heart sounds, including the "lub-dub" sound, is an essential part of a physical examination. Healthcare professionals use a stethoscope to assess heart sounds, which can help diagnose various cardiovascular conditions. The lub is slightly lower pitched and longer than the dub
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