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  2. Left axis deviation - Wikipedia

    en.wikipedia.org/wiki/Left_axis_deviation

    The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane.. In electrocardiography, left axis deviation (LAD) is a condition wherein the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between −30° and −90°.

  3. Right axis deviation - Wikipedia

    en.wikipedia.org/wiki/Right_axis_deviation

    The pathophysiology depends on the specific cause of right axis deviation. Most causes can be attributed to one of four main mechanisms. [14] [15] These include right ventricular hypertrophy, reduced muscle mass of left ventricle, altered conduction pathways and change in the position of the heart in the chest. [citation needed]

  4. T wave - Wikipedia

    en.wikipedia.org/wiki/T_wave

    ECG would be abnormal in 75 to 95% of the patients. Characteristic ECG changes would be large QRS complex associated with giant T wave inversion [4] in lateral leads I, aVL, V5, and V6, together with ST segment depression in left ventricular thickening. For right ventricular thickening, T waves are inverted from V2 to V3 leads.

  5. Left anterior fascicular block - Wikipedia

    en.wikipedia.org/wiki/Left_anterior_fascicular_block

    Left anterior fascicular block (LAFB) is an abnormal condition of the left ventricle of the heart, [1] [2] related to, but distinguished from, left bundle branch block (LBBB). It is caused by only the left anterior fascicle – one half of the left bundle branch being defective. It is manifested on the ECG by left axis deviation.

  6. 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.

  7. Long QT syndrome - Wikipedia

    en.wikipedia.org/wiki/Long_QT_syndrome

    Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. [7] It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. [1]

  8. Brugada syndrome - Wikipedia

    en.wikipedia.org/wiki/Brugada_syndrome

    Brugada syndrome (BrS) is a genetic disorder in which the electrical activity of the heart is abnormal due to channelopathy. [2] It increases the risk of abnormal heart rhythms and sudden cardiac death. [2] Those affected may have episodes of syncope. [2] The abnormal heart rhythms seen in those with Brugada syndrome often occur at rest.

  9. Left bundle branch block - Wikipedia

    en.wikipedia.org/wiki/Left_bundle_branch_block

    Left bundle branch block (LBBB) is a conduction abnormality in the heart that can be seen on an electrocardiogram (ECG). [1] In this condition, activation of the left ventricle of the heart is delayed, which causes the left ventricle to contract later than the right ventricle.

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