Initially, the blood flows passively into the ventricles, but near the end when there's just a bit left, there's an atrial contraction that gives the blood an extra hard push to help get it out.

起初，些血被动流入心室；但当快结束，心房还剩一点血时，心房收缩一下，把血液再用力推出心房。

Apple Watch can now screen your heart rhythm in the background, and it sends you a notification if it detects an irregular rhythm that appears to be atrial fibrillation.

果手表现在能在后台监测你的心律，当它监测到你的心律不规则或有心房纤颤时，它会向你发出提醒。

Ibuprofen should also be avoided in patients who have a heart condition such as atrial fibrillation who are on blood-thinning agents such as warfarin, rivaroxaban, or apixaban, as ibuprofen or NSAIDs in general increase the risk of bleeding.

布洛芬也应避免用于患有心脏疾病（如房颤）并正在服用血液稀释剂（如华法林、利伐沙班或阿哌沙班）的患者，因为布洛芬或非甾体抗炎药通会增加出血的风险。

Also, though, blood thinners can be prescribed instead if someone has an abnormal heart rhythm like atrial fibrillation, since clots are more likely to occur in the heart and travel to the brain.

如果患者有房颤等心律失时，也可以用抗凝剂代替，因为在些患者中，血栓容易在心脏形成并播散至脑部。

She had a restricted atrial septum and virtually no aorta. As soon as Dr. Burke opened up her chest, we knew she didn't have a chance.

她室间隔缺损几乎没有主动脉。Burke 医生一打开她的胸腔，我们就知道没有机会了。

C is for cardiac silhouette and size, this is the cardiac silhouette and there's an atrial appendage, the right atrium and the left ventricle.

C指" Cardiac" 心脏轮廓和大，心脏的轮廓，里心耳、右心房和左心室。

It's also important to obtain an electrocardiogram, which typically shows a prolonged QT interval, appearance of a U wave, and atrial or ventricular tachyarrhythmias.

心电图也很重要，典型表现出长QT间期，出现U波，以及房速或室速性心律失。

It found that women with Atrial fibrillation, or AF, were almost twice as likely to have fatal heart disease and strokes.

次审查发现，有心房颤动病症的妇女发展成致命心脏病和中风的几率男人的两倍。

This system transmits electricity along a precisely-timed pathway that ends with atrial and ventricular contractions — also known as heart beats.

个系统通过精确定时的途径传输电流，以心房和心室收缩结束——也称为心跳。

They were measuring two things: the number of what are called premature atrial contractions and premature ventricular contractions.

房性早搏和室性早搏的数量。

Wait a minute, why would a clot go from the left atrial appendage to give them a stroke?

等一下，为什么血块会从左心房附件出来导致中风？

An atrial fibrillation notification popped up.

房颤提示立马弹了出来。

I now get that a clot in the left atrial appendage is gonna cause a stroke by embolizing over to the brain or to the lungs or whatever.

我现在知道左心房附件的血块会通过使到大脑或肺部或其他地方栓塞引起中风。

But research has shown that having too many of these beats puts you at risk of atrial fibrillation, which is a dangerously irregular, rapid heart beat.

但研究表明，类心跳过多会造成房颤的风险，而房颤一种危险的不规则快速心跳。

Alright, as a quick recap - A premature atrial contraction is when the atria contract too early because of a depolarization from an ectopic focus.

好，快速总结一下：房性期前收缩指心房因为来自异位起搏点的除极化而过早地收缩。

Also an electrocardiogram might have changes such as a prolonged QT, prolonged ST segment, and arrhythmias, like torsade de pointes and atrial fibrillation.

心电图也可能会发生变化，例如QT延长、ST段延长，还有心律失，比如尖端扭转和房颤。

Typically treatment for premature atrial contractions isn't required.

通房性期前收缩并不需要治疗。

It's very common for everyone to have an early beat arising from the upper chambers of the heart called premature atrial contractions, or PACs, once in a while.

每个人的上心室偶尔都会出现早搏即房性早搏（PACs），非见的。

Okay, so that's because atrial fibrillation means a quivering of your atrium and that predisposes you to clot formation.

那因为心房颤动意味着心房颤抖使你容易形成血块。

They found that drinking coffee did not result in more premature atrial contractions — the early heart beats associated with atrial fibrillation.

他们发现，喝咖啡并没有导致更多的房性早搏——与房颤相关的心脏过早搏动。