Check the heart rate
Check the heart rhythm
Check the P wave
Check the PR interval
Check the QRS duration
Check the QT and QTc intervals
Check the electrical axis
Check for ST segment changes
Check for T wave abnormalities
Check for signs of chamber enlargement
Check for conduction blocks
Check for evidence of ischemia or infarction
Compare with previous ECGs
Review the machine interpretation
Correlate with symptoms and clinical findings