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Augmented Limb Leads Provide Three More Limb Leads

FIGURE 5 The upper panel illustrates how the mean electrical axis can be determined by plotting the deflection of any two leads vectorially. Only leads I, II, and III are shown for simplicity. Note that lead III shows a QRS complex that is of net-zero voltage and thus has a vector of zero magnitude. A resultant mean electrical axis of +30° was calculated. The lower panel shows the orientation and polarities of all six limb leads. Note that a lead is oriented every 30°.

FIGURE 5 The upper panel illustrates how the mean electrical axis can be determined by plotting the deflection of any two leads vectorially. Only leads I, II, and III are shown for simplicity. Note that lead III shows a QRS complex that is of net-zero voltage and thus has a vector of zero magnitude. A resultant mean electrical axis of +30° was calculated. The lower panel shows the orientation and polarities of all six limb leads. Note that a lead is oriented every 30°.

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