Rate: 100/minute
Rhythm: Sinus rhythm
Axis: Right axis deviation
Intervals: PR, QRS, QTc are all normal
Chamber enlargement: none
Ischemia and infarction: none

The most striking thing about this EKG is the right axis deviation (large Q wave in I) and the generally positive deflection of all complexes in lead aVR (usually P, QRS and T waves are negative in lead aVR). These are clues to switched limb leads.

When the leads were carefully replaced, the resulting EKG is a good example of a normal tracing!