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|nextname=Step 7: ST morphology
|mainauthor= [[user:Drj|J.S.S.G. de Jong, MD]]
[[Image:Nsr.jpg|thumb| Normal sinus rhythm with normal QRS morphology.]]
The basic questions in judging QRS morphology are:
*Are there any [[Q waves|pathological Q waves]] as a sign of previous myocardial infarction?
If all these items are normal you can go on to the next step: [[ST morphology]].