- published: 05 Feb 2014
- views: 335857
Electrocardiography (ECG or EKG*) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on a patient's body. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle depolarizing during each heartbeat.
In a conventional 12 lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles ("leads") and is recorded over a period of time (usually 10 seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle. The graph of voltage versus time produced by this noninvasive medical procedure is referred to as an electrocardiogram (abbreviated ECG or EKG).
During each heartbeat, a healthy heart will have an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node down into the bundle of His and into the Purkinje fibers spreading down and to the left throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of cardiac drugs, and the function of implanted pacemakers.
The QRS complex is a name for the combination of three of the graphical deflections seen on a typical electrocardiogram (EKG or ECG). It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization of the right and left ventricles of the human heart. In adults, it normally lasts 0.06–0.10 s; in children and during physical activity, it may be shoaves. The Q, R, and S waves occur in rapid succession, do not all appear in all leads, and reflect a single event, and thus are usually considered together. A Q wave is any downward deflection after the P wave. An R wave follows as an upward deflection, and the S wave is any downward deflection after the R wave. The T wave follows the S wave, and in some cases an additional U wave follows the T wave.
Depolarization of the heart ventricles occurs almost simultaneously, via the Bundle of His and Purkinje fibers. If they are working efficiently, the QRS complex is 80 to 120 ms in duration. This is represented by three small squares or less at the standard paper speed of 25 mm/s.
http://www.handwrittentutorials.com - This is the first video in a series on reading and interpreting ECGs. This tutorial covers ECG lead placement and the first principles of reading an ECG. For more entirely FREE medical tutorials and their accompanying PDFs, visit http://www.handwrittentutorials.com
Watch 700+ videos at https://www.DrNajeebLectures.com In this video about ECG - EKG Interpretation, you will learn in detail about: Read our article on Ascending tracts at: https://www.drnajeeblectures.com/ecg-interpretation/ ECG - EKG Interpretation Fundamentals of ECG What is Electrocardiography Function of Electrical activity in ventricular myocardium Resting membrane potential - definition and function Threshold Potential - Definition and How to Determine THP Gap Junction (electrical windows) between adjacent myocardial cells How ECG Interpretation Machine (galvanometer) Records Electrical Activity of the Heart? galvanometer - introduction and Functions How Cardiac Vectors Represents the Electrical Activity of the Myocardium Electrical Activity of the Heart (fast conduction VS Slow...
This video gives a quick and general review on reading an ECG. It gives almost all the essential things to check for on an ECG from the first look. To get into more details for the separate ECG findings; please check out my future videos to come! Thanks and Good luck! N.B.: This video is for educational purposes only. Please consult your specialist physician before managing your patients. Done by Dr. Wayel Zanjir
شرح الـECG بطريقة مبسطة وسهلة للدكتور محمود سويلم ------------------------ طب المنصورة طب 6 اكتوبر جامعة بغداد كلية الطب محاظرات كلية طب بغداد كلية طب الموصل طب الكوفة طب الموصل طب الانبار طب البصرة طب ديالى شرح الاشعة شرح ecg x-rays chest xray bone xray anatomy physical examination pathology clinical pharmacology clinical medicine طب باطني طب جراحة بولية جلدية عيون طالب كلية الطب محاظرات طبية للمرحلة الاولى الثانية الثالثة الرابعة الخامسة السادسة مدينة الطب blood tests محمود سويلم نزار باهبري فارماكولوجي طبيب الطوارئ ct scan طب الاسكندرية فحص المريض محاظرات جراحة نسائية وتوليد كسور جلدية بولية صيدلة طب الاسنان شرح الادوية دكتور نجيب فيزيلوجي بايوكمستري تشريح جسم الانسان امراض الكلى امراض القلب
http://www.interactive-biology.com - Making Biology Fun. In this video, I go through the P wave, QRS complex, T and U waves of the Electrocardiagram and go into the details of what each of them represents. Enjoy! http://www.interactive-biology.com
Learn how to perform an ECG by learning our guide to the best ECG lead placement positions. This is both useful for your OSCE exams or on the wards when you need an accurate ECG reading. For full written guides and OSCE tips go to: http://www.oscepass.com Anything we missed? Let us know how you would do things differently? Also write down your tips and questions below! :) Why not join our communities for regular help and fun! Like us on facebook https://www.facebook.com/oscepass Follow us on twitter https://twitter.com/oscepass Happy New Year all! Hope you have a brilliant one!
This video and other related images/videos (in HD) are available for instant download licensing here: http://www.alilamedicalmedia.com/-/galleries/images-videos-by-medical-specialties/cardiology-and-vascular-diseases Voice by Khoi Dao http://www.khoidaovoice.com/ ©Alila Medical Media. All rights reserved. The cardiac conduction system consists of the following components: - The sinoatrial node, or SA node, located in the right atrium near the entrance of the superior vena cava. This is the natural pacemaker of the heart. It initiates all heartbeat and determines heart rate. Electrical impulses from the SA node spread throughout both atria and stimulate them to contract. - The atrioventricular node, or AV node, located on the other side of the right atrium, near the AV valve. The AV nod...
Understanding the standard 12-lead EKG - Basics of electrocardiography explained. This video and other related images/videos (in HD) are available for instant download licensing here: http://www.alilamedicalmedia.com/-/galleries/images-videos-by-medical-specialties/cardiology-and-vascular-diseases ©Alila Medical Media. All rights reserved. Voice by: Sue Stern. All images/videos by Alila Medical Media are for information purposes ONLY and are NOT intended to replace professional medical advice, diagnosis or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition. Electrical activities of the heart can be picked up on the skin via electrodes. An ECG machine records these activities and displays them graphically. The...
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