ECG Findings in Massive Pericardial Effusion
Oct 8, 2024 · Electrical alternans. Consecutive, normally-conducted QRS complexes that alternate in height. Occurs when the heart swings backwards and forwards within a large fluid-filled pericardium. Electrical alternans: Alternating QRS complex height best seen in lateral precordial leads. Management.
Electrical Alternans - StatPearls - NCBI Bookshelf
Apr 7, 2023 · Electrical alternans is defined as alternating QRS amplitudes in any or all leads on an electrocardiogram (ECG) with no additional evident changes in conduction pathways of the heart. This rhythm is typically associated with pericardial effusion from fluid surrounding the heart.
Eletrical alternans: the ECG in pericardial effusion & cardiac ...
Electrical alternans in patient with cardiac tamponade. The ECG shows varying QRS and T-wave amplitudes. Learn about pericardial effusion, cardiac tamponade and electrical alternans, with emphasis on ECG, clinical features and causes.
Cardiac Alternans: Mechanisms and Clinical Utility in Arrhythmia ...
Oct 16, 2019 · In 1908, Heinrich Hering first described ECG alternans, a pattern of beat‐to‐beat oscillation in the ECG waveform. 3 Subsequently, repolarization alternans (RA), or alternans that manifests during ventricular repolarization, has been associated with an increased risk for ventricular tachyarrhythmic events (VTEs) and SCD under a wide range ...
Electrical alternans - Wikipedia
Electrical alternans is an electrocardiographic phenomenon of alternation of QRS complex amplitude or axis between beats and a possible wandering base-line. It is seen in cardiac tamponade and severe pericardial effusion and is thought to be related to changes in the ventricular electrical axis due to fluid in the pericardium , as the heart ...
Electrical Alternans: Background, Pathophysiology, Etiology - Medscape
Electrical alternans is a broad term that describes alternate-beat variation in the direction, amplitude, and duration of any component of the ECG waveform (ie, P, PR, QRS, R-R, ST, T, U). It...
Understanding Cardiac Alternans | Circulation Research
Mar 19, 2004 · Electrical alternans can be observed at the ECG level as alternation of the ST-segment and T-wave amplitude and form; T-wave alternans is commonly referred to as TWA. Clinical Relevance of T-Wave Alternans and Link to Cellular Studies
Cardiac alternans: Diverse mechanisms and clinical manifestations ...
Cardiac alternans has been subdivided info the following four categories: 1) mechanical, 2) electrical, 3) in association with myocardial ischemia, and 4) in association with cardiac motion. Mechanical alternans can be explained by hemodynamic or inotropic alterations, or both.
Cardiac Alternans: From Bedside to Bench and Back
Jan 5, 2023 · Cardiac alternans arises from dynamical instabilities in the electrical and calcium cycling systems of the heart, and often precedes ventricular arrhythmias and sudden cardiac death. In this review...
Electrophysiological Mechanisms Underlying T-Wave Alternans …
Mar 4, 2021 · Cardiac electrical alternans, first described by Lewis in 1910 (Cherry and Fenton, 2004), is manifested as every-other-beat alternations in the morphology of the electrocardiogram (ECG) observed in data from the same underlying pacing site. Clinically, T-wave alternans (TWA) is the most common form of cardiac electrical alternans.
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