library contents | ECG axis | ECG history | ECGs by Example

The electrical axis at a glance ... 2 glances actually.

Figure showing 4 quadrants Using leads I and aVF the axis can be calculated to within one of the four quadrants at a glance.

Figure showing quadrant 0 to minus 90 degrees. If the axis is in the "left" quadrant take your second glance at lead II.

causes of a Northwest axis (no man's land)

causes of right axis deviation

causes of left axis deviation

note: left ventricular hypertrophy is not a cause left axis deviation

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©1996 Dean Jenkins.