In lab last week, I calculated the mean electrical axis of my heart lying down, lying on my left side and standing (above). It's a bit of a rough calculation as the grid is very small so it is hard to denote small differences in numbers.According to my notes, "If an ECG is read from all three leads, the MEA with respect to the plane of the chest can be defined by calculating a vector based on the directional component from each lead, as determined by the 'net amplitude' of the QRS in each lead."
Also according to my notes, the normal mean electrical axis for a human is +59 but anywhere from 45-90 is OK.
As I understand it, it is basically telling me the direction in which depolarization is occurring in relation to the rest of my chest.
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