What Is The Lub Dub Sound [new] Direct

What does the sound lub dub means in cardiac cycle? - Vedantu

In a healthy heart, the blood flows smoothly, and the valves are quiet except for that closing snap. However, sometimes doctors hear extra sounds. what is the lub dub sound

While many murmurs are "innocent" (harmless), others can signal that a valve is leaking (regurgitation) or has become too stiff to open fully (stenosis). What does the sound lub dub means in cardiac cycle

| Type | Finding | Pathology | | :--- | :--- | :--- | | | Splitting persists and widens on inspiration | Right bundle branch block (RBBB), pulmonary stenosis | | Fixed splitting | Splitting unchanged by respiration | Atrial septal defect (ASD) | | Paradoxical (reversed) splitting | Splitting narrows on inspiration, widens on expiration | Left bundle branch block (LBBB), aortic stenosis, hypertrophic cardiomyopathy | While many murmurs are "innocent" (harmless), others can

To prevent blood from flowing backward into the upper chambers (atria), the mitral and tricuspid valves snap shut simultaneously. That "slamming" of the valves is the "lub." The "Dub" (S2)

During expiration, the gap narrows, and S2 is heard as a single "dub."