The most common abnormal heart sound is a — a whooshing, swishing, or humming sound that replaces or accompanies the normal lub-dub.
After the ventricles finish contracting and begin to relax, the pressure inside them drops. To prevent blood that was just pumped out from rushing back into the heart, the (the semilunar valves) snap shut.
The order is based on the in the heart cycle. Systole (contraction) always comes before diastole (relaxation). The AV valves (lub) must close at the start of contraction. The semilunar valves (dub) close at the end of contraction. what is lub dub sound
That silence is actually the busiest time for your heart! During the silence after the "dub," the heart muscle is relaxing and the chambers are filling up with blood again, preparing for the next "lub." The heart is never truly resting; it is just cycling through different mechanical jobs.
These are "whooshing" or "swishing" noises heard between the lub and the dub. They are caused by turbulent blood flow, often due to a valve that doesn't close tightly enough or is too narrow. The most common abnormal heart sound is a
But what exactly causes these two distinct sounds? Why doesn't the heart make just one sound? And what happens when "lub-dub" turns into something else, like a "whoosh" or a "click"?
But what exactly creates those sounds? It isn’t the heart muscle squeezing; it’s actually the sound of "doors" slamming shut. The "Lub" (The First Heart Sound - S1) The first sound, the , is technically known as S1 . The order is based on the in the heart cycle
Disclaimer: This post is for educational purposes only. If you are concerned about your heart rhythm or hear unusual sounds, please consult a medical professional.
A third (S3) or fourth (S4) sound can create a rhythm that sounds like a galloping horse, sometimes indicating heart failure or hypertension.
: This is the first heart sound. It occurs when the atrioventricular (AV) valves —the mitral and tricuspid valves—close. This happens at the start of systole , when the heart's lower chambers (ventricles) contract to pump blood out of the heart.