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【科普动画】心脏传导系统和理解心电图(ECG)(中文字幕)

时间:2020-03-06 访问量:

视频介绍

心脏传导系统由以下部分组成-
The cardiac conduction system consists ofthe following components:
窦房结或SA节点
– The sinoatrial node, or SA node,
位于靠近上腔静脉入口
located in the right atrium near the entrance of the
与右心房的交界处
superior vena cava.
这是心脏的自然起搏点
This is the natural pacemaker of the heart.
它引导心脏搏动 并确定心率
It initiates all heartbeat and determinesheart rate.
电冲动从窦房结传遍了
Electrical impulses from the SA node spread
整个心房
throughout both atria and stimulate them to
并刺激它们收缩
contract.
房室结或称AV结
– The atrioventricular node, or AV node,
位于右心房的另一侧
located on the other side of the right atrium, near
在三尖瓣的附近
the AV valve.
房室结承担电冲动的作用 从心房传到心室的唯一通道
The AV node serves as electrical gateway tothe ventricles.
它能延迟电脉冲传导到心室
It delays the passage of electrical impulsesto the ventricles.
这种延迟是为了确保
This delay is to ensure
心房已经泵出所有的血液进入收缩前的心室
that the atria have ejected all the blood into the ventricles
房室结从窦房结
before the ventricles contract.
接收信号
– The AV node receives signals
并将它们传递到房室束
from the SA node and passes them onto the atrioventricular
也就是希氏束
bundle – AV bundle or bundle of His.
希氏束被分成左
– This bundle is then divided
右束支朝心尖传递冲动
into right and left bundle branches which conduct the impulses
然后这些冲动被传递到浦肯野
toward the apex of the heart.
(PUR-KIN-JEE)纤维
The signals are then passed onto Purkinje fibers,
再向上传动
turning upward and spreading throughout
并使全部心室肌几乎同时被激动
the ventricular myocardium.
心脏的电活动可以记录成心电图
Electrical activities of the heart can be recorded
简称EKG或ECG
in the form of electrocardiogram,
心电图(ECG或EKG)复合
ECG or EKG.
了节点和心肌的细胞产生
An ECG is a composite recording
的所有动作电位
of all the action potentials produced by the nodes and
心电图的各
the cells of the myocardium.
波形或段
Each wave or segment
对应于心脏电周期的
of the ECG corresponds to a certain event of the cardiac electrical
一个特定的事件
cycle.
当心房充盈
When the atria are full of blood,
窦房结发出冲动 电信号传遍了整个心房
the SA node fires, electrical signals spread throughout
并促使他们去极化
the atria and cause them to depolarize.
这在心电图上的用P波表示
This is represented by the P wave on the ECG.
P波开始后约100毫秒
Atrial contraction, or atrial systole starts about 100 ms
心房收缩
after the P wave begins.
PQ段表示信号从窦房结传到
The P-Q segment represents the time the signals travel
房室结的时间
from the SA node to the AV node.
QRS波群标志房室结
The QRS complex marks the firing
发出冲动 代表心室去极化的全过程
of the AV node and represents ventricular depolarization:
Q波对应于室间隔的去极化
– Q wave corresponds to depolarization ofthe interventricular septum.
R波对应于心室肌的去极化
– R wave is produced by depolarization of the main mass of the ventricles.
S波对应于心室除极的最后一个阶段
– S wave represents the last phase of ventricular depolarization
心室基底部
at the base of the heart.
心房复极也在此期间发生
– Atrial repolarization also occurs
但信号被QRS波群遮蔽
during this time but the signal is obscured by the
ST段反映了心肌动作电位
large QRS complex.
的平台期 表示心室收缩
The S-T segment reflects the plateau in themyocardial action potential.
和泵血
This is when the ventricles contract and pumpblood.
T波表示心室舒张 或者心室复极前的心肌舒张
The T wave represents ventricular repolarizationimmediately before ventricular relaxation,
每一次心跳进行
or ventricular diastole.
一个循环
The cycle repeats itself with every heartbeat.

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