Past medical history of rheumatic heart disease with mitral valve stenosis.

以前有风湿性心脏病伴二尖瓣狭窄病史。

That's where the mitral valve closing is best heard.

这个位置就是听二尖瓣关闭的最佳位置。

So the first " lub" that you hear in that lub-DUB is made by the mitral and tricuspid valves closing.

所以你在 lub-DUB 中听到的第一个“lub”是由二尖瓣和三尖瓣关闭发出的。

After entering the left atrium, the blood goes through the second atrioventricular valve called the mitral valve into the left ventricle.

进入左心房后，血液穿过第二个房室瓣膜，称为二尖瓣，进入左心室。

And because it's basically the tricuspid and mitral valve closing, it's best heard in the tricuspid valve and mitral valve area.

因为它主要是因为二尖瓣和三尖瓣关闭的声音，所以它可以在二尖瓣和三尖瓣听诊区被清晰听到。

Then the atrium contracts, which increases the pressure, so the blood passes down through the mitral valve into the left ventricle.

然后心房收缩，增，所以血液通过二尖瓣进入左心室。

The chambers on the left side are underdeveloped. In addition, the mitral valve, which connects these two chambers, is abnormally narrow.

左心室发育得不完全。而且二尖瓣连接着左右心室也狭窄得很严重。

Finally, Marfan syndrome is a risk factor for mitral valve prolapse, where the mitral valve pouches into the left atrium during systole.

最后，马方综合征也是二尖瓣脱垂的一个危险因素，即二尖瓣在收缩期时突向左心房。

Might I ask you--would you have the kindness? I have grave doubts as to my mitral valve, if you would be so very good.

我可以不可以请求您--您肯不肯给我听一听？劳驾吧，我心脏的僧帽瓣也许有毛病。

In this case, since it's the mitral valve, we call this mitral regurgitation.

在这种情况下，由于是二尖瓣，我们称之为二尖瓣反流。

Other conditions that cause audible systolic murmurs include ventricular septal defect and mitral valve prolapse.

产可闻及的收缩期杂音的其他情况包括室间隔缺损和二尖瓣脱垂。

The mitral valve only has two cusps or leaflets one in front, called the anterior leaflet (that's a little smaller), and one behind it, called the posterior leaflet.

二尖瓣只有两个尖瓣叶：一个在前面，叫前叶，小一些；另一个在后面，叫后叶。

For example, the right and left atria are both full of blood, and that blood moves through the tricuspid and the mitral valve to get down into the ventricles.

例如，右心房及左心房充满了血；这些血将经从二尖瓣及三尖瓣到心室。

Right after the S2 sound, the tricuspid and mitral valves open back up allowing blood to fill up the ventricles again and this period of time is called diastole.

在S2之后，三尖瓣和二尖瓣打开；让血液再次充盈心室，这段时期叫做心脏舒张期。

From the lungs, freshly oxygenated blood flows back into the left atrium and passively passes through the mitral or bicuspid valve to fill the left ventricle.

新鲜的含氧血液从肺部流回左心房，被动地通过二尖瓣（bicuspid valve）注入左心室。

Now that blood is freshly oxygenated from its trip to the lungs, it returns to the left atrium of the heart and passively flows through the bicuspid (or mitral valve).

现在，血液从进入肺部时被新鲜氧化，回到心脏的左心房，并被动地流过二尖瓣（或mitral valve）。

That first heart sound, " lub" , is called S1, and the noise comes from the tricuspid and mitral valves snapping shut when the left and right ventricles contract, which happens at about the same time.

第一心音“lub”叫做S1，是在左、右心室同时收缩，三尖瓣和二尖瓣关闭时发出的声音。

Examples of conditions associated with common systolic murmurs include: mitral valve regurgitation, when the mitral valve does not close properly and blood surges back to the left atrium during systole.

二尖瓣反流，当二尖瓣关闭不全时，血液在收缩期反流至左心房。

Oxygenated blood returns to the heart by way of pulmonary veins, which empty into the left atrium. Atrial contractions force blood from the left atrium through the mitral valve, also called bicuspid valve, into the left ventricle.

当心室收缩时，左室内血液经主动脉瓣流入主动脉¬----人体最大的动脉，为全身组织供血。