…Figure 1. Components of the ventricular conduction system and the temporal association between the ECG and impulse transmission through the heart. An intraventricular conduction delay…

…Disease Study,1 which enrolled 10,899 participants with baseline ECG examinations. Individuals with nonspecific intraventricular conduction delays were at particularly high risk of death…

…blood supply of the conduction system Figure 1 presents the components of the conduction system and the arterial blood supply. The first third of the…

…of acute coronary syndromes, particularly ST elevation myocardial infarction (STEMI), ischemic injury can disrupt the conduction system at any level, producing atrioventricular (AV) or intraventricular…

…Figure 1 ). The interval from the premature beat to the next sinus beat will be longer than one normal sinus interval. The P wave of…

…provided that intraventricular conduction is normal). If the P wave is visible, it is retrograde in lead II (because of the reversed direction of atrial…

…atrial fibrillation) if the block in the AV node is high grade. Causes of tachyarrhythmia with narrow QRS complexes (QRS duration < 0.12 s…

…high suspicion of intermittent infrahisian block should be maintained, particularly in older patients and those exhibiting a bundle branch block (BBB) or an intraventricular conduction…

ECG Hypertrophy and dilatation Principles of atrial and ventricular enlargement (hypertrophy and dilatation) Cardiac chamber enlargement refers to abnormally large atria or abnormally large ventricles…

…one being refractory and the other capable of conducting the impulse, re entry may arise. This is illustrated in Figure 1 (study this figure carefully)…

…visible P wave. The QRS complex is generally normal, unless there is concomitant intraventricular conduction disturbance. Figure 1 (below) displays two ECGs with a junc

…reduced intraventricular pressure and thereby reduced myoardial load. Pulmonary embolism causes increased right ventricular load, which results in increased oxygen demand and dilatation of the…

…across the valve (ΔP) from right intraventricular pressure. The systolic PA pressure is an indicator of cardiac hemodynamic status and may be estimated with…

ECG Introduction to ECG interpretation 1. Which of the following ECG findings is typically considered a normal variant in asymptomatic athletes with no significant family…

…life threatening clinical syndrome in which increased intrapericardial pressure compresses the heart and impairs ventricular filling. It generally results from accumulation of pericardial fluid, blood…

…is subdivided into the following two fascicles: (1) the anterior (anterosuperior) fascicle , which delivers the electrical impulse to the anterior wall of the left ventricle…

…thickness of the interventricular septum (B) and the inferolateral wall (A) have also been measured. The image sector is created using sequential activation of the…

…congestion may be important mechanisms. Diuretics relieve the hemodynamic consequences of congestion by producing a negative sodium and water balance. They can reduce jugular venous…

…interventricular septum, or mitral valve apparatus. These lesions can cause acute severe regurgitation, a left to right shunt, tamponade, or sudden loss of effective cardiac…

ECG Introduction to ECG interpretation The QRS complex (ventricular complex): normal and abnormal configurations and intervals A complete QRS complex consists of a Q , R…

…Left anterior descending coronary artery (LAD) The LAD supplies the anterior two thirds of the interventricular septum (this area is referred to as anteroseptal area )…