Combining information from ECG tracing, 2D and tissue Doppler assessment of contractility, and spectral tracing across the LVOT can provide evaluation of the electrical activation of the heart, mechanical activation of the heart, and the ultimate “success” of these activation efforts in producing ...
Alternans is an electrophysiological phenomenon consisting in a beat-to-beat variation of the morphology of an electrocardiographic (ECG) waveform. Literature has particularly studied T-wave alternans (TWA) because it has been widely recognized as a noninvasive and clinically useful index to predict ...
Electrical alternans is a pattern of variation in the shape of ECG waveform that appears on an every-other-beat basis (10–21). Electrocardiographic alternans was first described in 1908 by Hering (10). Shortly thereafter, Thomas Lewis (11)recognized that cardiac alternans could occur in normal...
ECG signal processingThe possible dependence of T-wave alternans (TWA) on T-wave amplitude was investigated in 3 orthogonal leads (X, Y, Z) 20-min resting ECG recordings and in the derived vector magnitude (VM) from 176 healthy (H) subjects and 200 coronary-artery-disease (CAD) patients....
Ambulatory ECG-based T-wave alternans and heart rate turbulence can predict cardiac mortality in patients with myocardial infarction with or without diabetes mellitus. COMPARISON OF T WAVE ALTERNANS IN PATIENTS WITH CARDIOMYOPATHY AND HEALTHY CONTROLS Predictive value of T-wave alternans for arrhythmic ...
(ECG)-based test that can be performed in a physician's office with modifications to currently available exercise testing equipment. The test measures beat-to-beat microvolt variations in the shape, amplitude, or timing of theECGT-wave that have been linked with the development of clinical ...
She was admitted and underwent telemetry monitoring. Several hours after admission, she developed recurrent chest discomfort associated with clinically significant acute ECG changes (Figure, A) that preceded manifestation of torsades de pointes (TdP) (Figure, B). Full Text Comment...
(ECG), moderate hypokalemia that was corrected after intravenous potassium administration, and detectable cocaine on urine drug screen results. She was admitted and underwent telemetry monitoring. Several hours after admission, she developed recurrent chest discomfort associated with cli...
We recorded the surface ECG, monopha... M Kameyama,Y Hirayama,H Saitoh,... - 《Journal of Electrocardiology》 被引量: 77发表: 2003年 Ca(2+) Overload and Sarcoplasmic Reticulum Instability in tric-a Null Skeletal Muscle CARDIACALTERNANSCALCIUMCHANNELSRELEASEMECHANISMSRESPONSESPROTEINSThe sarcoplasmic...
The surface ECG deflections that arise from propagation through slowly conducting myocardium (late potentials) are assumed to maintain a constant relation to the QRS complex with respect to morphology, timing, and duration. Therefore any beat-to-beat variability that occurs about the 'constant' low-...