For a comprehensive discussion of hyperkalemia on the ECG with many examples of the different phases, go to Life In The Fast Lane. Ed Burns has compiled a very instructive collection of ECGs that illustrate the progression of this deadly condition.
Dr. Steve Smith's blog has several very good discussions on the subject. For a comparison of tall T waves caused by several factors, including hyperkalemia, go to Dr. Smith's Blog.
- See more at: http://ecgguru.com/ecg/hyperkalemia#sthash.tW2jfw7v.dpuf
You could find and ask directly dr Adrian Baranchuk in the researchgate.net. He just recently published an article interatrial block related with AF or Atrial flutter in Heart Rhythm journal. May be he has an article related with your question.