What does an upside down P wave mean?

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  1. #usually
  2. #upside
  3. #travel
  4. #comes
  5. #image
  6. #right
  7. #patient
  8. #inverted
  9. #atrium
  10. #always
  11. #below
  12. #upward
  13. #often
  14. #waves
  15. #called
  16. #create