PPT-Tachycardias

or slow down you move too fast Susan P Torrey MD FACEP FAAEM Associate Professor of Emergency Medicine Tufts University School of Medicine Baystate Medical Center Springfield Mass. . M.V.Jorat. MD. 1389. Definition. Narrow QRS complex supraventricular tachycardia (SVT) is a tachyarrhythmia with a rate more than 100 beats/min and a QRS duration of less than 120 milliseconds.. A narrow QRS complex (<120 msec) reflects rapid activation of the ventricles via the normal His-Purkinje system, which in turn suggests that the arrhythmia originates above or within the atrioventricular (AV) node (ie, a supraventricular tachycardia). . . .. Four structures. are key to the conduction of electrical impulses through the heart muscle. :. The . sinoatrial (SA) node. located in the right atrium . . •. The atrioventricular (AV) node. Of these, reentry is responsible for the majority of clinical arrhythmias. It should be recognized that the mechanism responsible for initiation of an arrhythmia might be different than the mechanis Podrid\'s Real-World ECGs combines traditional case-based workbooks with a versatile Web-based program to offer students, health care professionals, and physicians an indispensable resource for developing and honing the technical skills and systematic approach needed to interpret ECGs with confidence. ECGs from real patient cases offer a complete and in-depth learning experience by focusing on fundamental electrophysiologic properties and clinical concepts as well as detailed discussion of important diagnostic findings and relevant management decisions. Six comprehensive volumes encompass more than 600 individual case studies-plus an online repository of hundreds more interactive case studies (www.realworldECGs.com)-that include feedback and discussion about the important waveforms and clinical decision-making involved. From an introductory volume that outlines the approaches and tools utilized in the analysis of all ECGs to subsequent volumes covering particular disease entities for which the ECG is useful, readers will take away the in-depth knowledge needed to successfully interpret the spectrum of routine to challenging ECGs they will encounter in their own clinical practice.