In a healthy adult, the heart makes two sounds, commonly described as ‘lub’ and ‘dub.’. The third and fourth sounds may be heard in some healthy people, but can indicate impairment of the …

The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole. The heart tone “dub,” or S2 ( a combination …

In healthy adults, there are two normal heart sounds, often described as a lub and a dub that occur in sequence with each heartbeat. These are the first heart sound (S 1) and second heart …

通常情况下,只能在健康人中听到第一、第二心音，这兩個心音常常被描述為"lub"或"啦"，而第二個為"dub"、"dup"或"答" [2] ，分別由房室瓣與半月瓣的關閉產生。除了這些正常的聲音，也可能 …

S4听起来有点像“ta-lub-dub”。 通常，这种“僵硬”是由于心室肌肥大（体积增大），以对抗主动脉或肺动脉中的高压。 换句话说，S4是 压力超负荷或严重高血压 的典型标志。

Opening and closing of heart valves makes the heart rhythm come alive with its lub dub beats... Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi...

One of its most recognizable features is the distinctive sound it makes—often described as a “lub dub.” Understanding what makes the lub dub sound involves delving into the mechanics of …

It is the sound of these cusps coming back together to form a temporary seal that makes the sound we recognize as a heartbeat. But what makes a lub-dub become a lub-dub-whoosh? …

The sounds are often described as a constant “lub-dub, lub-dub.” The first “lub-dub” is the sound of the mitral and tricuspid valves closing. The second “lub-dub” is the sound of the aortic and …

Los ruidos cardíacos S1 y segundo (S2, diastólico) son componentes normales del ciclo cardíaco y suelen expresarse como “lub-dub”. El S1 se ausculta justo después del comienzo de la …