A tall QRS complex is hard to define. By the Sokolov-Lyon criteria, the QRS is large if the S wave in V1 + R in V5 or V6 is more than 35 mm. A tall QRS complex is most often associated with left ventricular hypertrophy, but additional criteria must be met to make this diagnosis. The QRS voltage may also be high in lean, athletic patients without evidence of hypertrophy.See also: QRS complex
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