While the word "murmur" sounds frightening, many are "innocent" and require no treatment. However, distinct changes in the S1 and S2 sounds are often the first clues doctors use to diagnose structural heart problems.
To understand the sound, we must first understand the machinery. The heart is divided into four chambers: two upper chambers called atria and two lower chambers called ventricles.
It is caused by the simultaneous closure of the mitral and tricuspid valves (the atrioventricular valves). what causes the lub dub sound of your heartbeat
The silence represents , the period when the heart muscle relaxes and the chambers fill with blood. This is actually the most critical time for the heart muscle itself. The coronary arteries—the blood vessels that feed the heart muscle—receive their blood flow primarily during this relaxation phase.
These valves sit between the upper chambers (atria) and the ventricles. Closing them prevents blood from being pushed back into the atria when the ventricles squeeze. 2. The "Dub" Sound (S2) The second heart sound, known as S2 , is the "dub". While the word "murmur" sounds frightening, many are
Here is a deep dive into the mechanics behind the "lub-dub" and what that rhythm tells us about the health of the body’s most vital organ.
Sometimes, the smooth lub-dub is replaced by a "whooshing" or "swishing" sound. This is known as a . The heart is divided into four chambers: two
The lub-dub is not a design flaw or a noisy byproduct. It is an elegant, real-time acoustic feedback loop. A doctor with a stethoscope can instantly tell:
The "lub-dub" sound of a heartbeat is caused by the . Each "lub" and "dub" corresponds to a specific pair of valves snapping shut to prevent blood from flowing backward, ensuring it moves in one direction through the circulatory system. 1. The "Lub" Sound (S1) The first heart sound, known medically as S1 , is the "lub".