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Left axis deviation: Wikis

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The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane.

Left axis deviation is a condition where the QRS complex is positive in lead I, but negative in lead II. Left axis deviation is also described as an ECG with the mean electrical axis from -30° to -90°. Common causes include left ventricular hypertrophy, Left anterior fascicular block, inferior myocardial infarction, hypertension and emphysema. [1]

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