Myocardial infarction is caused by an abrupt occlusion of coronary artery that shuts down the blood supply to the heart. decreased arterial oxygen supply ➡️ ATP depletion & decreased Na/K ATPase activity ➡️ partial depolarization ➡️ increased excitability & reentry (adjacent normal ca...
Loss of precordial T-wave balance occurs when the upright T wave is larger than that in V6. This is a type ofhyperacute T wave. The normal T wave in V1 is inverted. An upright T wave in V1 is considered abnormal — especially if it is tall (TTV1), and especially if it is n...
T wave amplitudeventricular action potentialThe T wave seen on the surface ECG represents the repolarization of the ventricular action potential. The amplitude of the T wave is usually most positive in the anterior leads, specifically V2 or V3. The upper limits of normal for positive T wave ...
Atrial escape beat 35 35 n Supraventricular escape beat 36 36 @ Link to external data (aux_note contains URL) 37 37 x Non-conducted P-wave (blocked APB) 38 38 f Fusion of paced and normal beat 39 39 ( Waveform onset 40 40 ) Waveform end 41 41 r R-on-T premature ventricular ...
Figure 38. The electrical axis of the heart (heart axis). As evident from the figure, the normal heart axis is between –30° and 90°. If the axis is more positive than 90° it is referred to as right axis deviation. If the axis is more negative than –30° it is referred to ...
正常ECG(戚恒)心电图的基础知识 心电图的概念：心脏每次机械性收缩之前先产生电激动，心房和心室电激动可经人体组织传到体表，因电流的强弱与方向不断的变动，各体表的电位也不断的变动，用心电图机从体表连续记录每个心动周期所产生电位曲线叫心电图。心电图是临床诊断疾病的方法之一，是临床医师必须掌握的诊断...
Tall secondary R wave in lead V1 Wide, slurred S wave in leads I, V5, V6 Associated feature: ST segment depression and T-wave inversion in leads V1, V2, and sometimes V3 Usually a normal axis Normal variant in ∼ 5% of individuals [10] Cardiac Coronary artery disease Myocardial...
Tall secondary R wave in lead V1 Wide, slurred S wave in leads I, V5, V6 Associated feature: ST segment depression and T-wave inversion in leads V1, V2, and sometimes V3 Usually a normal axis Normal variant in ∼ 5% of individuals [10] Cardiac Coronary artery disease Myocardial...
QT interval is usually 0.32s to 0.44s in normal heart rate. QT间期 QRS波群起点至T波终点时间,代表心室除极和复极的总共时间。其随心率变化而变化,正常心率范围内QT间期在0.32～0.44s。 U wave It is the low and flat wave at 0.02-0.04s after T wave, which direction is consistent with T wave....
非Q波性心梗 non-Q wave MI 非持续性室速 nonsustained ventricular tachycardia 非透壁性心梗 nontransmural MI 正常窦性心律 normal sinus rhythm 二尖瓣型P波 P mitrale 肺型P波 P pulmonale 房性早搏 PAC / Premature atrial contractions 起搏心律 pacemak...