Ebook Graphics-sequenced interpretation of ECG: Part 2
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Ebook Graphics-sequenced interpretation of ECG: Part 2
Chapter 4QRS ComplexRui Zeng, Xiaohan Zhang, Tianyuan Xiong, Guojun Zhou, and Rongzheng Yue4.1Normal QRS Complex4.1.1Features of Normal ORS ComplexỌRS Ebook Graphics-sequenced interpretation of ECG: Part 2S complex is a group of waves of comparatively deep amplitude and shows the electrical changes during left and right ventricular depolarization.The morphological features of normal ỌRS complex can be summarized into the main wave's direction and the morphology of Q (q) wave.1The main wave is positiv Ebook Graphics-sequenced interpretation of ECG: Part 2e, in leads I. II. and V4 to V6. while the main wave is negative in leads aVR and VI.2From lead VI to V6. R wave grows taller, s wave grows lower, andEbook Graphics-sequenced interpretation of ECG: Part 2
R/S ratio becomes larger.3In leads VI and V2. there should be no Ọ (q) wave (ỌS pattern can be present). In leads aVR. aVL. and III. there can be Q oChapter 4QRS ComplexRui Zeng, Xiaohan Zhang, Tianyuan Xiong, Guojun Zhou, and Rongzheng Yue4.1Normal QRS Complex4.1.1Features of Normal ORS ComplexỌRS Ebook Graphics-sequenced interpretation of ECG: Part 2ast one limb lead, the sum of Q. R. and s voltages (sum of the absolute values) is greater than or equal to 0.5 mV.R. Zeng (E3)Department of Cardiology, West China Hospital. West China School of Medicine.Sichuan University. Chengdu. Sichuan Province. P.R.Chinae-mail: zengrui_0524@ I26.comX. Zhang • Ebook Graphics-sequenced interpretation of ECG: Part 2T. Xiong • G. ZhouWest China School of Medicine. Sichuan University. Chengdu. Sichuan Province. P.R.ChinaR. YueDepartment of Nephrology. West China HoEbook Graphics-sequenced interpretation of ECG: Part 2
spital, West China School of Medicine.Sichuan University. Chengdu. Sichuan Province. P.R.China© Springer Science+Business Media Singapore Pte Ltd.69anChapter 4QRS ComplexRui Zeng, Xiaohan Zhang, Tianyuan Xiong, Guojun Zhou, and Rongzheng Yue4.1Normal QRS Complex4.1.1Features of Normal ORS ComplexỌRS Ebook Graphics-sequenced interpretation of ECG: Part 2oltages is greater than or equal to 0.8 mV.3RV5<2.5 mV, RaVL<1.2 mV, RaVF<2.0 mV. RI<1.5 mV, and RV5+SV 1 <3.5-4 0 mV.4RV1 < 1.0 mV. RV1 +SV5< 1.2 mV. and RaVR<0.5 mV.If you think what is mentioned above is lengthy or hard to memorize, don't worry and just keep reading, and you will find some simple Ebook Graphics-sequenced interpretation of ECG: Part 2 drawing that can help you understand and memorize these details with ease.4.1.2QRS Vector LoopSince the myocardial cells participating in depolarizatEbook Graphics-sequenced interpretation of ECG: Part 2
ion are located in different parts of the heart, the vectors that represent their depolarization can point to different directions, when the ventricleChapter 4QRS ComplexRui Zeng, Xiaohan Zhang, Tianyuan Xiong, Guojun Zhou, and Rongzheng Yue4.1Normal QRS Complex4.1.1Features of Normal ORS ComplexỌRS Ebook Graphics-sequenced interpretation of ECG: Part 2: if they form angle between 0° and 180°. the diagonal of the parallelogram is defined as their resultant vector, or mean vector (Fig. 4.1). Therefore, the interaction all the vectors have with each other al any moment can be summed into an instant resultant vector.Since the number and the position Ebook Graphics-sequenced interpretation of ECG: Part 2of the myocardial cells involved in the depolarization are constantly changing, the length and direction of the instant resultant vector vary al diffeEbook Graphics-sequenced interpretation of ECG: Part 2
rent moment of the ventricular depolarization. If we draw a line to connect the termination of the vectors together in an order, or record the processChapter 4QRS ComplexRui Zeng, Xiaohan Zhang, Tianyuan Xiong, Guojun Zhou, and Rongzheng Yue4.1Normal QRS Complex4.1.1Features of Normal ORS ComplexỌRS Ebook Graphics-sequenced interpretation of ECG: Part 2vide the ventricular depolarization into nine parts, record the amplitude and direction of the instantaneous complex vector: (b) Draw a line IO connect the termination of the vectors together in proper order and you get a ỌRS vector loop4 QRS Complex714.1.3Formation of Normal QRS Complex in Limb Lea Ebook Graphics-sequenced interpretation of ECG: Part 2dsIf we placed the QRS vector loop into hexaxial reference system that we've learnt before, we could easily understand the morphology of ỌRS complex iEbook Graphics-sequenced interpretation of ECG: Part 2
n limb leads (Figs. 4.2, 4.3,4.4. and 4.5).Fig. 4.2 Projection of QRS vector loop on axes in hexaxial reference systemChapter 4QRS ComplexRui Zeng, Xiaohan Zhang, Tianyuan Xiong, Guojun Zhou, and Rongzheng Yue4.1Normal QRS Complex4.1.1Features of Normal ORS ComplexỌRSChapter 4QRS ComplexRui Zeng, Xiaohan Zhang, Tianyuan Xiong, Guojun Zhou, and Rongzheng Yue4.1Normal QRS Complex4.1.1Features of Normal ORS ComplexỌRSGọi ngay
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