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  2. T wave - Wikipedia

    en.wikipedia.org/wiki/T_wave

    The last half of the T wave is referred to as the relative refractory period or vulnerable period. The T wave contains more information than the QT interval. The T wave can be described by its symmetry, skewness, slope of ascending and descending limbs, amplitude and subintervals like the T peak –T end interval. [1] In most leads, the T wave ...

  3. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    Electrocardiography is the process of producing an electrocardiogram (ECG or EKG [a]), a recording of the heart's electrical activity through repeated cardiac cycles. [4] It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart [ 5 ] using electrodes placed on the skin.

  4. T wave alternans - Wikipedia

    en.wikipedia.org/wiki/T_wave_alternans

    The TWA test uses an ECG measurement of the heart's electrical conduction using electrodes attached to one's torso. It takes approximately a half-hour to perform on an outpatient basis. The test looks for the presence of repolarization alternans (T-wave alternans), which is variation in the vector and amplitude of the T wave component of the ...

  5. Wiggers diagram - Wikipedia

    en.wikipedia.org/wiki/Wiggers_diagram

    P=P wave, PR=PR interval, QRS=QRS complex, QT=QT interval, ST=ST segment, T=T wave Wiggers with jugular venous waveform Wiggers diagram with mechanical (echo), electrical (ECG), and aortic pressure (catheter) waveforms, together with an in-ear dynamic pressure waveform measured using a novel infrasonic hemodynography technology, for a patient ...

  6. De Winter syndrome - Wikipedia

    en.wikipedia.org/wiki/De_Winter_syndrome

    Risk factors are similar to other types of ischemic heart disease. [1] The underlying mechanism is unclear; though may involve subendocardial ischemia or collateral circulation. [1] Diagnosis is based on an ECG showing ST-segment depression at the J-point of 1 to 3 mm in leads V1 to V6, with tall and symmetrical T waves. [1]

  7. Rhythm interpretation - Wikipedia

    en.wikipedia.org/wiki/Rhythm_interpretation

    A premature atrial pacemaker has a regular underlying rhythm however there is a premature beat which can be identified by an irregular p wave with a different size, shape, and direction often found within a T wave, the PR interval is generally normal however can be hard to measure, the QRS complex is premature for the PAC, but is generally normal.

  8. Electrical alternans - Wikipedia

    en.wikipedia.org/wiki/Electrical_alternans

    Electrical alternans is an electrocardiographic phenomenon of alternation of QRS complex amplitude or axis between beats and a possible wandering base-line. It can be 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 essentially wobbles in the fluid filled ...

  9. Wellens' syndrome - Wikipedia

    en.wikipedia.org/wiki/Wellens'_syndrome

    Wellens' syndrome is an electrocardiographic manifestation of critical proximal left anterior descending (LAD) coronary artery stenosis in people with unstable angina. ...

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