The QRS complex (ventricular complex): normal and abnormal configurations and intervals. A complete QRS complex consists of a Q-, R- and S-wave. However, all three waves may not be visible and there is always variation between the leads. Some leads may display all waves, whereas others might only display one of the waves.

1) s1. 出现在 心室等容收缩期 ，在心电图qrs波群后0.02~0.04s,标志心室收缩期的开始。s1产生的机制主要是“ 瓣膜起源学说 ”：由心室收缩开始时二尖瓣、三尖瓣骤然关闭的振动所致。s1在心前区各部都可以听到，但以心尖部最强且清晰。

QRS综合波大体上是由三个阶段的心室除极向量形成的。 ①起始向量；起始0.01s，反映室间隔的除极向量。 由于左束支的分支较早，在室间隔中部左室面分为室间隔支，心房下传的激动沿着此支首先抵达该处并使之除极，然后电激动向室间隔的右室面推进，故初始向量的除极方向自左向右，投影在V1导联的正侧端产生初始的r波（面对电源）：投影在V5导联的负侧端产生q波（面对电穴）又称q向量。 ②最大向量（亦称R向量）；反映0.02～0.04s左右心室本部的除极。 由于左 …

Diagram showing how the polarity of the QRS complex in leads I, II, and III can be used to estimate the heart's electrical axis in the frontal plane. The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram (ECG or EKG). It is usually the central and most visually obvious part of the tracing.

The QRS duration is generally <0,10 seconds but must be <0,12 seconds. If the QRS duration is ≥ 0,12 seconds (120 milliseconds) then the QRS complex is abnormally wide (broad). This is a very common and significant finding. The reason for wide QRS complexes must always be …

Causes of tachycardia (tachyarrhythmia) with wide QRS complexes (QRS duration ≥0,12 s): ventricular tachycardia is the most common cause and it is potentially life-threatening. Note that 10% of wide complex tachycardias actually originate from the atria but the QRS complexes become wide due to abnormal ventricular depolarization (e.g. sinus ...

2012年6月8日 · 其中 q 波为 qrs 波群中的第一个负向波, r 波为一个正向 ( 直立) 波, r 波之后的负向波称为 s 波。 QRS 波最前部分可以有 Q 波, 也可以无 Q 波。 S 波和 T 波之间的部分称为 ST 段。

二尖瓣和三尖瓣关闭时的振动产生第一心音，即S1（声音2）。 通常，只能听到第一心音的两个成分，第一个成分——M1代表二尖瓣关闭，第二个成分——T1代表三尖瓣关闭。 心室收缩早期两个瓣膜关闭，只是二尖瓣关闭较三尖瓣关闭稍早些。 （1）听诊区和心电图对应. M1和T1通常认为是一个声音，称为S1，用膜型听诊器在二尖瓣表面的心尖部听诊最佳，因为左心的心音在这个位置更强些，因此听起来是一个音，S1发生在心电图的QRS之后。 把听诊器从二尖瓣区寸移到三尖 …

心电图特征：心电图中qrs波终末向量在－90～－150度之间，心电图Ⅰ、ii、iii导联均出现明显的s波，称为s1s2s3综合症。 由于终末QRS向量位于右上象限，故在avR导联出现迟晚的R波，易被误诊为右束支传导阻滞。

At normal and slow heart rates, S 1 is the first of the paired heart sounds, following the longer diastolic period and preceding the shorter systolic period. These sounds can be separated by simultaneously feeling or looking at the apex impulse while listening; the first heart sound is synchronous with the outward thrust of the apex impulse.