Tiêu cực hay "đảo ngược" U sóng bệnh tim thiếu máu cục bộ (thường chỉ còn lại chính hoặc bệnh LAD) Nhồi máu cơ tim (dẫn đầu với sóng Q bệnh lý) Trong tập phim của thiếu máu cục bộ cấp tính (đau thắt ngực hoặc thiếu máu cục bộ do tập luyện) Post extrasystolic ở những bệnh nhân bị bệnh tim mạch vành | Lesson XII - Nice Seeing U Again waves and prominent II waves Quinidine and other type 1A antiarrhythmics CNS disease with long QT intervals often the T and II fuse to form a giant T-II fusion wave click here to view . lead II III V4-6 LVH right precordial leads with deep s waves Mitral valve prolapse some cases Hyperthyroidism Negative or inverted II waves Ischemic heart disease often indicating left main or LAD disease L Myocardial infarction in leads with pathologic Q waves L During episode of acute ischemia angina or exercise-induced ischemia L Post extrasystolic in patients with coronary heart disease L During coronary artery spasm Prinzmetal s angina Nonischemic causes L Some cases of LVH or RVH usually in leads with prominent R waves L Some patients with LQTS see below Lead V6 shows giant negative TU fusion wave in patient with LQTS a prominent upright u wave is seen in Lead V1 http kw ecg ecg_outline Lesson12 2 of 3 5 11 2006 9 39 44 AM Lesson XII - Nice Seeing U Again click here to view Test your knowledge on lessons X-XII by clicking here Requires Internet http kw ecg ecg_outline Lesson12 3 of 3 5 11 2006 9 39 44 AM Lesson V cont - ECG Rhythm Abnormalities The Alan E. Lindsay ECG Learning Center In Cyberspace o Home o Intro o Outline Images a Tests o ACCiAHA o o Search Lesson V cont Introduction to ECG Rhythm Analysis Frank G. Yanowitz MD Associate Professor of Medicine University of Utah School of Medicine I II III IV V VI VII IX X XI XII Return to the beginning of Uesson V Things to Consider When Analyzing Arrhythmias Arrhythmias may be seen on 12-lead ECGs or on strips of one or more leads. Some arrhythmias are obvious at first glance and don t require intense analysis. Others however are more fun They require detective work . logical thinking based on a knowledge of cardiac electrophysiology. The analysis should begin with identifying characteristics of impulse formation if known as