How do you know if ECG is normal?

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  1. #there
  2. #paper
  3. #intervals
  4. #range
  5. #beginning
  6. #measured
  7. #squares
  8. #normal
  9. #first
  10. #isoelectric
  11. #complex
  12. #small
  13. #interval
  14. #deflection
  15. #recognised