The T-wave of an electrocardiogram (ECG) represents the ventricular\nrepolarization that is critical in restoration of the heart muscle to a\npre-contractile state prior to the next beat. Alterations in the T-wave reflect\nvarious cardiac conditions; and links between abnormal (prolonged) ...
These action potentials spread from cell to cell producing a wave of depolarization and a subsequent wave of repolarization with each impulse produced. The electrocardiogram (ECG) displays the electrical activity of the heart. Each ECG wave r...
Fill in the blank: Normally, the T wave on an ECG has a positive deflection of about ___ mV. T Wave: In an electrocardiogram, the T wave represents ventricular repolarization. Ventricular polarization refers to when the muscle cells of the ventricles contract to pump ...
Assessment of the T-wave represents a difficult but fundamental part of ECG interpretation. The normal T-wave in adults is positive in most precordial and limb leads. The T-wave amplitude is highest in V2–V3. The amplitude diminishes with increasing age. As noted above, the transition from...
Two preliminary studies showed that T-wave flattening and masseter muscle tension reliably indexed the cardiac sympathetic and skeletal muscle components of a conditioned emotional response. These indices were then used to investigate cardiac sympathetic and skeletal muscle correlates of conditioned suppression...
We investigated ECG T-wave patterns (phenotypes) in members of families linked to three genetically distinct forms of the long QT syndrome. Methods and Results Five quantitative ECG repolarization parameters, ie, four Bazett-corrected time intervals (QT 展开 ...
The heartbeat is recorded on an electro- cardiogram (ECG) as a characteristic trace determined by changes in the electrical activity of the heart muscle. The T wave is a component of this waveform that is associated with the repolarization phase of the action potentials. It is asymmetrical in...
You may be wondering why none of the listed waves or complexes represents the return of the stimulated (depolarized) atria to their resting state. The answer is that the atrial ST segment (STa) and atrial T wave (Ta) are generally not observed on the routine ECG because of their low ampl...
二.心脏记忆性T波(cardiac memory T—wave) 又称为电张力调整性T波。1982年由 Rosenbaum等最早提出,是指在一段时间的异常心室 激动终止后能引起随后的窦性心律出现时间依赖性 T波改变,即T波向量方向与异常心室激动时的 QRS主波同向。 心电图上表现为...
For this aim, the ECG amplitude modulation and the baseline wander in the ST-T segment are approximated by a scaling factor applied to the T wave added to a constant. Thanks to this simplification, the proposed global model of each ST-T segment is constituted by the scaled T wave, an ...