electrical alternans ecg
1997;1(3):390-4. doi: 10.1023/a:1009902030340. Fuchs T, Torjman A. Zareba W, Moss AJ, le Cessie S, Hall WJ.
Hazim A, Belhamadia Y, Dubljevic S. Effects of mechano-electrical feedback on the onset of alternans: A computational study.
It was first recognized over a century ago by Theodor Herring in 1909,Electrical alternans is not a distinct entity in itself, but rather an ECG sign of an underlying cardiac pathology. All complications are related to the underlying disease process.Hering HE. Microvolt t-wave alternans with exercise in pediatrics and congenital heart disease: limitations and predictive value.
Morady F, DiCarlo LA Jr, Baerman JM, de Buitleir M, Kou WH. Electrical alternans is an electrocardiographic phenomenon of alternation of QRS complex amplitude or axis between beats and a possible wandering base-line.
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Cardiac electrical dynamics: maximizing dynamical heterogeneity. This is most classically seen in Conditions such as cardiomyopathies or heart failure are associated with structural alterations of the cardiac tissue as well as generation of pathways with altered conduction characteristics.A number of cardiac conditions (eg, ischemia, heart failure) can exaggerate the inherent heterogeneity of the myocardial repolarization characteristics,Alterations in calcium-handling dynamics in certain regions of the myocardium lead to changes in the repolarization characteristics of these areas, manifesting as electrical alternans.
Overall, QRS alternans is the most commonly reported, although it is only seen in 5%-10% of patients with tamponade. Note the phasic nature to the QRS morphology, particularly in the rhythm strip in V1.Electrical alternans. Hellerstein HK, Liebow IM. Electrical alternation in experimental coronary artery occlusion. The ABCD (Alternans Before Cardioverter Defibrillator) Trial: strategies using T-wave alternans to improve efficiency of sudden cardiac death prevention. Modified moving average analysis of T-wave alternans to predict ventricular fibrillation with high accuracy.
Mechanism linking T-wave alternans to the genesis of cardiac fibrillation. Goyal M, Woods KM, Atwood JE. 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).
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This electrocardiogram reveals macro-T wave alternans with switched polarity seen in all leads.
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Electrical alternans occurs when.
The classical Beck triad of jugular venous distention, hypotension, and muffled heart sounds, or any of its individual features could arise from cardiac tamponade.
Murda'h MA, McKenna WJ, Camm AJ. This electrocardiogram shows ventricular tachycardia from the right ventricular outflow tract (RVOT) region. Costantini O, Hohnloser SH, Kirk MM, et al, for the ABCD Trial Investigators.
Subtle electrical alternans in a large pericardial effusion with tamponade. Electrical alternans is a broad term that describes alternate-beat variation in the direction, amplitude, and duration of any component of the electrocardiograph (ECG) waveform (ie, P, PR, QRS, R-R, ST, T, U). In the setting of long QT syndrome (LQTS), remove the offending drugs and correct concomitant dyselectrolytemias.
T-wave alternans. From pulsus to pulseless: the saga of cardiac alternans. the heart swings backwards and forwards within a large fluid-filled pericardium.
Gilmour RF Jr, Gelzer AR, Otani NF. T-wave alternans is observed in about 45% of patients with congenital long QT syndrome during Holter monitoring.The finding of electrical alternans during supraventricular tachycardia does not in itself change the prognosis; however, some forms of electrical alternans have prognostic value.
consecutive, normally-conducted QRS complexes alternate in height. T wave alternans in idiopathic long QT syndrome. NCBI Bookshelf Buxton AE, Lee KL, Fisher JD, Josephson ME, Prystowsky EN, Hafley G. A randomized study of the prevention of sudden death in patients with coronary artery disease. Saito S, Watanabe I, Hibiya K, et al.
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