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  2. T wave - Wikipedia

    en.wikipedia.org/wiki/T_wave

    Inverted T wave is considered abnormal if inversion is deeper than 1.0 mm. Inverted T waves found in leads other than the V1 to V4 leads is associated with increased cardiac deaths. Inverted T waves associated with cardiac signs and symptoms ( chest pain and cardiac murmur ) are highly suggestive of myocardial ischaemia . [ 4 ]

  3. 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°.

  4. Left bundle branch block - Wikipedia

    en.wikipedia.org/wiki/Left_bundle_branch_block

    T-waves usually point in the opposite direction to the terminal portion of the preceding QRS - positive QRS complexes have negative T-waves while negative QRS complexes have positive T-waves. The ST segments typically slur into the T-wave and often appear elevated in leads with negative QRS complexes. [3]

  5. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    T wave: The T wave represents the repolarization of the ventricles. It is generally upright in all leads except aVR and lead V1. Inverted T waves can be a sign of myocardial ischemia, left ventricular hypertrophy, high intracranial pressure, or metabolic abnormalities. Peaked T waves can be a sign of hyperkalemia or very early myocardial ...

  6. Left ventricular hypertrophy - Wikipedia

    en.wikipedia.org/wiki/Left_ventricular_hypertrophy

    The Cornell voltage criteria [13] for the ECG diagnosis of LVH involve measurement of the sum of the R wave in lead aVL and the S wave in lead V 3. The Cornell criteria for LVH are: S in V 3 + R in aVL > 28 mm (men) S in V 3 + R in aVL > 20 mm (women) The Romhilt-Estes point score system ("diagnostic" >5 points; "probable" 4 points):

  7. Wellens' syndrome - Wikipedia

    en.wikipedia.org/wiki/Wellens'_syndrome

    Originally thought of as two separate types, A and B, it is now considered an evolving wave form, initially of biphasic T wave inversions and later becoming symmetrical, often deep (>2 mm), T wave inversions in the anterior precordial leads.

  8. 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.

  9. T wave alternans - Wikipedia

    en.wikipedia.org/wiki/T_wave_alternans

    T-wave alternans and prolonged QT interval in a male patient found to be in a narrow-complex tachycardia and ruled in for an acute myocardial infarction.Administered Ibutilide and converted to sinus rhythm but subsequently had an episode of Torsades de Pointes which required DC cardioversion back into sinus rhythm.