Echocardiography Myocardial ischemia and infarction Definition and pathophysiology Left ventricular (LV) thrombus is an intracavitary clot attached to the LV endocardium, typically overlying an akinetic…

…notched R waves in leads I, aVL, and the left precordial leads, and narrow r waves followed by broad, deep S waves in the right…

…no elevation). Figure 1. Coronary artery anatomy in angiographic and computed tomography (CT) views. (A) Angiographic schematic showing the right coronary artery (RCA), left main…

…changes : Left sided leads (V5, V6, I and aVL) show T wave inversions and ST segment depressions. V1–V3 shows ST segment elevation and positive…

…leads apply in the absence of left ventricular hypertrophy or left bundle branch block [8, 10]. Characteristics of ST Elevation in Acute Transmural Ischemia When…

…dysfunction and death. In the setting of ST elevation myocardial infarction (STEMI), cardiogenic shock most commonly reflects severe left ventricular (LV) dysfunction, accounting for approximately…

…left bundle branch block, Wolff–Parkinson–White patterns or ventricular pacing STEMI and non ST segment elevation myocardial infarction (NSTEMI) are contemporary clinical and electrocardiographic…

…in patients with STEMI, those with NSTEMI and unstable angina are at considerable risk of developing life threatening ventricular arrhythmias (ventricular tachycardia, ventricular fibrillation) and…

…ST segment elevations on the conventional 12 lead ECG. These situations are as follows: Transmural ischemia located in the posterolateral portion of the left ventricle…

…ECG examples of ST Elevation Myocardial Infarction (STEMI) STEMI Example 1 STEMI Example 2 STEMI Example 3 STEMI Example 4 STEMI Example 5 STEMI Example…

…therapy Management Recommendation Level of evidence Reperfusion is indicated in all patients with symptoms of ischaemia of <12 h duration and persistent ST segment elevations…

…2) in these leads. These ECG changes were previously referred to as strain pattern because it was believed that they indicated left ventricular exhaustion. However…

…Atherothrombosis represents the acute, life threatening complication of coronary atherosclerosis. The transition from a quiescent plaque to a highly thrombogenic surface occurs via three primary…

…fundamental pathophysiological substrate for acute coronary syndromes (ACS), including ST Elevation Myocardial Infarction (STEMI) [1] . Historically viewed as a simple plumbing problem characterized by the…

…Life threatening arrhythmias or cardiac arrest after presentation Mechanical complications of myocardial infarction Recurrent dynamic ECG changes suggestive of ischaemia, especially intermittent ST segment elevation…

DICTrank: The Largest Reference List of 1318 Human Drugs Ranked by Risk of Drug Induced Cardiotoxicity Using FDA Labeling . Drug Discovery Today. 2023. DICT =…

…fibrinogen depletion. Successful fibrinolysis is generally accompanied by relief of ischaemic symptoms, at least 50% resolution of ST segment elevation, and haemodynamic stability. Selection of…

…primary PCI remains indicated when there are ongoing ischaemic symptoms, haemodynamic instability or life threatening arrhythmias. Twelve to 48 hours after onset: routine primary PCI…

…in left ventricular stroke volume produces an exaggerated inspiratory fall in systemic systolic blood pressure, termed pulsus paradoxus. Tamponade is therefore characterized haemodynamically by elevation…

…PH) is a heterogeneous pathophysiological disorder characterized primarily by elevation of pulmonary arterial pressure. It may arise from pulmonary vascular disease, left sided cardiac disease…

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…

…during the first days after ST elevation myocardial infarction (STEMI). The principal lesions are: Ventricular septal rupture (VSR), producing an acute left to right shunt…

ECG Myocardial ischemia and infarction Definition and Pathophysiology Posterior myocardial infarction is myocardial necrosis involving the posterior region of the left ventricle, usually as part…

…distinct electrocardiographic (ECG) signature—coved ST segment elevation in the right precordial leads—and a propensity for life threatening polymorphic ventricular tachycardia (VT) and ventricular…

Arrhythmias and arrhythmology ECG Genetic and miscellaneous conditions Brugada syndrome: A life threatening arrhythmia with unknown prevalence Pedro Brugada and his two brothers, Josep and…

…NSTEMI (Non ST Elevation Myocardial Infarction). Orientation of myocardial fibers The orientation of myocardial fibers varies, and this allows the left ventricle to contract in…

…medical discussion: the ECG blog Genetic and miscellaneous conditions A novel potentially life threatening cardiac arrhythmia syndrome identified with ECG The ECG may be used…

…These depressions are reciprocal ST segment depressions, meaning that they mirror the ST segment elevations. If the terminal portion of the T wave in V1…

…spasm produces a reversible functional occlusion and usually causes transmural ischaemia. The resulting abnormalities in left ventricular function may lead to myocardial infarction, ventricular tachycardia…

…electrolyte imbalances are clinically negligible (from an electrophysiological standpoint), whereas others may be life threatening. The most common and clinically most relevant electrolyte imbalances concern…

…P wave in V1 Terminal negative component 1 mm × 40 ms Left atrial enlargement Low voltage QRS < 5 mm in the limb leads or…

…ACS. It is to determine whether the patient is clinically unstable, identify life threatening diagnoses rapidly, and select a safe disposition and diagnostic strategy. Only…

…characterized by persistently elevated plasma low density lipoprotein cholesterol (LDL C) from early life and a consequent excess risk of premature atherosclerotic cardiovascular disease (ASCVD)…

…effects on alpha receptors. Stimulation of beta receptors increases inotropy and chronotropy by elevating intracellular cyclic adenosine monophosphate (cAMP) and calcium, as well as through…

…hypotension, or evidence of low output despite relatively limited elevation of left sided filling pressure. Evaluation and physical examination Initial assessment should establish whether the…

…coronary artery disease (CAD). It combines echocardiographic assessment of left ventricular (LV) structure and function with exercise or pharmacological stress. The physiological basis is an…

…performed. Note that troponins may be elevated but the elevation is typically discrete and not on a par with the degree of left ventricular impairment…

…the chest leads (V1 through V6) are displayed on the ECG paper in their anatomically contiguous order from right anterior (V1) to left lateral (V6)…

…from it. AF has important consequences beyond the arrhythmia itself. It may cause symptoms and impaired quality of life, contribute to heart failure, and increase…

…adverse cardiovascular events. Complete revascularization is therefore considered an important therapeutic objective, particularly in patients with left ventricular dysfunction and/or MVD. Nevertheless, the optimal…

…Initial hs cTn measurement Continuous cardiac monitoring The source material does not provide a detailed list of physical examination findings or a specific examination sequence…

…solely as an isolated coronary event. SCAD predominantly affects the left sided coronary circulation and may involve multiple vessels. Pregnancy associated SCAD can occur at…

…sustained bradyarrhythmia, tachyarrhythmia, or severe hypertension with or without left ventricular hypertrophy. Among patients with NSTE ACS undergoing angiography, approximately 10% have no critical epicardial…

…with chest pain the primary task is to exclude or verify the following potentially life threatening causes of chest pain: Ischemic heart disease : stable angina…

…little calculation. Sensitivity and specificity vary markedly, as discussed in detail in the articles on left ventricular enlargement, right ventricular enlargement and atrial enlargement. Below…

…particularly before laboratory results are available. Notably: Both hyperkalemia and hypokalemia can induce life threatening arrhythmias and cardiac arrest, with hyperkalemia being the most prevalent…

…rhythm, rapid progression of R waves in precordial leads. Slight ST segment elevation in leads V2 V3, which is normal in men and women. ECG…

…of the PR segment. ST segment elevation implies that the ST segment is elevated above the level of the PR segment. The magnitude of any…

…sinus bradycardia (<30 beats/min or sinus pauses ≥3s) C: Increased QRS voltage (isolated QRS voltage criteria for left ventricular hypertrophy or right ventricular hypert

…that increase myocardial oxygen demand include sustained tachyarrhythmia and severe hypertension, with or without left ventricular hypertrophy. In patients with stable known or presumed CAD…

…available. Recall that ST segment elevations also become normalized as a part of the natural course of myocardial infarction (refer to Figure 2 below). However…

…symptoms of ischemia follows: Left bundle branch block (LBBB) can mimic acute STEMI , as it often presents with similar ECG changes, including ST segment elevations…

…result in hemorrhage within the pericardium. Ventricular rupture : A transmural infarction can cause a rupture in the left ventricular free wall. Mediastinal trauma : Penetrating injuries…

…may be caused by myocardial ischemia. Other symptoms include dyspnea, pain radiating to the left arm/shoulder/throat, palpitations, back pain and selected cases of…

…majority of cases, it is only possible to determine the ischemic/infarct area (and thus the culprit) if the ECG displays ST segment elevations. However…

…entry circuits , causing rapid and chaotic ventricular depolarizations, rendering the left ventricle incapable of generating effective contractions. This results in circulatory collapse, loss of consciousness…

…segment depressions with prominent T waves in the majority of the chest leads may indicate an acute occlusion in the LAD (left anterior descending artery)…

…patients with total and proximal occlusions may present without ST segment elevations (which they should exhibit) due to rich collateral circulation in the ischemic area…

…a bloodless field one works by feel, and by feel nail spicules are left behind — which is the commonest cause of recurrence. Indications Condition Procedure : …

…Bronchospasm. Caution • Avoided in hypertensive emergencies with left ventricular failure (due to negative inotropic effect). • Used cautiously in patients with asthma (due to risk of…