Note that the first three account for almost 90% of ECG tracings with LAD. If the QRS is predominantly negative in lead I and positive in lead aVF, then the axis is rightward (right axis deviation).
See the ECG basics section on determining axis for details. If the QRS is upright in lead I and downward (negative) in lead aVF, then the axis is between 0 and -90 degrees, likely left axis deviation.
A 76-year-old woman presents with a persistently rapid heart rate that she attributes to her pacemaker. What does the ECG show?
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback