This rhythm is often referred to as a "heartbeat" or "cardiac cycle." The time between each lub-dub is approximately 0.8-1.2 seconds, which corresponds to a heart rate of 60-100 beats per minute.
The rhythmic "lub-dub" is the signature sound of a healthy human life, reflecting the mechanical precision of the heart's valves as they orchestrate the flow of blood. Far from being just a simple beat, these sounds—clinically known as —provide a critical window into the heart's performance. The Anatomy of a Heartbeat: What is "Lub-Dub"? heart sound lub dub
Doctors listen to lub-dub with a stethoscope (auscultation) because: This rhythm is often referred to as a
“Hearing ‘lub-dub’ means your heart valves are working like strong, coordinated doors. Any extra noise doesn’t always mean danger — but it’s worth getting checked.” heart sound lub dub
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