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  2. Third-degree atrioventricular block - Wikipedia

    en.wikipedia.org/wiki/Third-degree_atrio...

    Since pacemaker correction of the third-degree block requires full-time pacing of the ventricles, a potential side effect is pacemaker syndrome, and may necessitate the use of a biventricular pacemaker, which has an additional 3rd lead placed in a vein in the left ventricle, providing more coordinated pacing of both ventricles.

  3. Supraventricular tachycardia - Wikipedia

    en.wikipedia.org/wiki/Supraventricular_tachycardia

    A 12-lead ECG showing paroxysmal supraventricular tachycardia at about 180 beats per minute. Subtypes of SVT can often be distinguished by their electrocardiogram (ECG) characteristics. Most have a narrow QRS complex , although, occasionally, electrical conduction abnormalities may produce a wide QRS complex that may mimic ventricular ...

  4. Torsades de pointes - Wikipedia

    en.wikipedia.org/wiki/Torsades_de_pointes

    Torsades de pointes, torsade de pointes or torsades des pointes (TdP; also called torsades) (/ t ɔːr ˌ s ɑː d d ə ˈ p w æ̃ t /, [2] French: [tɔʁsad də pwɛ̃t̪], translated as "twisting of peaks") is a specific type of abnormal heart rhythm that can lead to sudden cardiac death.

  5. The resting 12-lead ECG is a useful test to differentiate CPVT from other electrical diseases of the heart that can cause similar abnormal heart rhythms. Unlike conditions such as long QT syndrome and Brugada syndrome , the resting 12-lead ECG in those with CPVT is generally normal. [ 8 ]

  6. Vectorcardiography - Wikipedia

    en.wikipedia.org/wiki/Vectorcardiography

    The mean, normal SA in healthy young adult females and males is 66° and 80°, respectively, [9] and very similar magnitudes are found in the elderly population (65 years and older). [10] In ECG analysis, the SA is categorized into normal (below 105°), borderline abnormal (105–135°) and abnormal (greater than 135°). [11]

  7. QT interval - Wikipedia

    en.wikipedia.org/wiki/QT_interval

    In the superimposed median beat method, a median ECG complex is constructed for each of the 12 leads. The 12 median beats are superimposed on each other and the QT interval is measured either from the earliest onset of the Q wave to the latest offset of the T wave or from the point of maximum convergence for the Q wave onset to the T wave ...

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