Electrocardiographic amplitudes: a new risk factor for sudden death in hypertrophic cardiomyopathy.

Gender differences in normal individuals Figure 1 A shows that there are no significant differences in QRS-amplitude sum in the six limb-leads between males and females ( P = 0.78), but there are highly significant differences in QRS-amplitude sum from the six chest-leads, with values in females being lower ( P = 0.00001).

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