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 normal ST-T isointegral map from a patient with LBBB is typically a mirror image of the QRS map—that is, maximum potential on the upper or midanterior chest and minimum potential located over the left anterior chest, left axilla, or left posterior chest.

The atlas contains 18 and 22 different paced QRS integral map patterns obtained in patients with previous anterior or inferior myocardial infarction, respectively. Each specific QRS pattern in the atlas provides a unique infarct-specific spatial electrocardiographic representation of the onset of ectopic ventricular activation in a ...

2010年12月1日 · Catheter mapping and ablation are increasingly performed for complex arrhythmias that require a complete understanding of mapping techniques to identify the arrhythmia substrate. In this session of Teaching Rounds, we begin a 3-part series that focuses on key issues related to 3-dimensional electroanatomic mapping.

1994年1月1日 · During RF catheter ablation of postinfarction VT, body surface QRS integral mapping offers an efficient clinical tool that can be used as a first-step localization procedure that may guide subsequent catheter pace mapping or activation mapping quickly to the arrhythmogenic target area.

1998年1月1日 · We investigated the spatial resolution of QRS isointegral maps by means of an anatomically accurate computer model of the human ventricular myocardium that incorporates a bidomain model for simulating the realistic activation sequences and the oblique dipole model in combination with the boundary element method for calculating extracardiac ...

2024年3月24日 · 目前QRS波检测方法主要有:差分法 (Derivative)、带通滤波法 (Bandpass filter) 、小波变换 (Wavelet Transfom)、形态学运算 (Mathematical Morphology、长度和能量变换 (Length and Energy Transtfoms) 等;另外还有一些新兴的研究方法，如人工神经网络 (Arificial Neural Networks,ANN)、遗传算法 ( Genetic Algorithm，GA)、句式分析 ( Syntactic Methods)、隐Markov 模型 ( Hidden Markov Models, HMM)、 匹配滤波 (Matched Filter) 、Hilbert变换 …

2020年10月20日 · qrs 波群是心电图最主要最突出的波段，是检测其他波形的前提，p 波和 t波在诊断中也有重要意义。通过对临床 qrs 复合波的形态研究，根据小波多分辨率分析的特点和模极大值检测原理，提出一种 marr 小波链检测 qrs 波群的新算法。

1、正常的 QRS波群：QRS波群代表左右心室除极而产生的电位变化情况。 ——我们首先应当掌握QRS波群的“向量环”：它是指每一个瞬间，心室除极的瞬间综合向量的尖端所组成的环线。 这个环线其实是一个三维曲线，并且是一个环线，在额面上，其呈现逆时针变动。 （如下右图）。 ——上述“向量环”中的每一个向量在额面六轴系统的某一个导联轴上的投影，就是该瞬间下该导联下的波形位置。 如果投影方向与导联轴方向相反，则位置为负；反之，则位置为正。 ——一 …

We investigated the spatial resolution of QRS isointegral maps by means of an anatomically accurate computer model of the human ventricular myocardium that incorporates a bidomain model for simulating the realistic activation sequences and the oblique dipole model in combination with the boundary element method for calculating extracardiac ...