…contraindications, and subject preparations. We will also discuss the relevance of withholding specific cardioactive medications during exercise testing (exercise ECG). Indications for exercise stress test…

ECG Introduction to ECG interpretation QT duration and corrected QT (QTc) duration ECG interpretation always includes an assessment of the QT interval (QT duration). The…

Cardiology Introduction Ventricular tachycardia (VT) represents a complex and potentially lethal spectrum of cardiac arrhythmias that remains a formidable challenge in contemporary cardiovascular medicine. As…

…into primary and secondary. Primary and secondary ST T changes Primary ST T changes are caused by abnormal repolarization . This is seen in ischemia, electrolyte…

…segment starts. The T wave The T wave reflects the rapid repolarization (recovery) of the myocardium and T wave changes occur in numerous conditions. T…

…foramen ovale – between the right and left atrium. Most of the blood in the right atrium flows through the foramen ovale into the left atrium…

…foramen ovale – between the right and left atrium. Most of the blood in the right atrium flows through the foramen ovale into the left atrium…

…Figure 1. The electrical axis of the heart (heart axis). As evident from the figure, the normal heart axis is between –30° and 90°. If…

…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…

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

ECG Introduction to ECG interpretation ECG Interpretation: definitions, criteria, and characteristics of the normal ECG waves, intervals, durations and rhythm This is arguably one of…

…which then spreads through the myocardium like a wave front in water. Figure 2 shows the appearance of the action potential in contractile myocardial cells…

ECG Introduction to ECG interpretation Standard display of ECG leads in the 12 lead ECG Numerous conditions that can be diagnosed using the 12 lead…

…requires comprehensive efforts and resources, ranging from continuously training laymen in the community to establishing advanced post resuscitation care. Since the majority of all sudden…

…the incidence of heart failure among young adults has increased in recent years ( Nabel et al, Savarese et al ). This is a paradoxical and worrisome…

…it bulges into the artery lumen and causes stenosis (reduction of the artery lumen). The reduction of the artery lumen causes limitations to the blood…

…stress testing also provides information on electrocardiographic (ECG) reaction, the occurrence of arrhythmias, symptoms, physiological reactions (blood pressure, heart rate) during and after exercise, etc…

ECG Introduction The traditional classification of acute coronary syndromes (ACS) into ST segment elevation myocardial infarction (STEMI), non STEMI (NSTEMI), and unstable angina (UA) has…

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…

…to distinguish between two main types of cardiac cells: Conduction cells form the fiber networks that sprout into the myocardium and disseminate the action potential…

…to pump blood into the right ventricle. Right atrial enlargement (hypertrophy) leads to stronger electrical currents and thus enhancement of the contribution of the right…

…must be differentiated from hyperacute T waves seen in the very early phase of myocardial ischemia. Hyperacute T waves are broad based, high and symmetric…

…elevation, and sudden cardiac death (SCD), Brugada syndrome (BrS) has evolved from an obscure electrocardiographic curiosity into a major focus of contemporary cardiac electrophysiology [1] …

…ischemia and infarction Introduction Clinical assessment of coronary artery disease (CAD) requires integration of symptoms, cardiovascular risk, coronary anatomy, myocardial ischaemia, ventricular function and the…

Introduction to Coronary Atherosclerosis, Plaques, Atherothrombosis Coronary atherosclerosis is a chronic, progressive, and highly dynamic inflammatory disease of the arterial wall. It is characterized by…

ECG Introduction to ECG interpretation Lathundar The Cardiac Electrical Axis: Definition, Clinical Implications, and Deviations Definition and Mechanism of the Electrical Axis The heart's…

…retrograde (inverted) P waves, which can be located anywhere between the J point and the terminal part of the T wave. PR interval 0,22…

ECG Introduction to ECG interpretation The ECG leads Before discussing the ECG leads and various lead systems, we need to clarify the difference between ECG…

…balance between treatment benefit and harm. Prevention in the very elderly therefore extends beyond reducing myocardial infarction, stroke, heart failure, or cardiovascular death. Preservation of…

…The depolarization spreads from the sinoatrial node to the atrial and ventricular myocardium. Propagation of the action potential is possible because all cardiac cells are…

…ischemia and infarction Introduction Drug eluting stents (DES) are the predominant device used during percutaneous coronary intervention (PCI). They evolved from balloon angioplasty and bare…

…bundle branches. This type of first degree AV block often progresses to third degree (complete) AV block, and therefore necessitates an artificial pacemaker. Blocks located…

…on AV blocks (refer to Introduction to AV Blocks). Second degree AV block is defined by the intermittent failure of atrial impulses to conduct to…

ECG Video lecture: Introduction to Electrocardiology and ECG Interpretation