J-point depression on Holter

  I am a 27 yr old female who had a holter done recently.  The Cardiologist says I have
  SVT.  I have a question regarding one of the comments on the Holter
  report though:
    - What does "borderline J-Point Depression" mean?
  I often have times when my heart beats so fast that I nearly black out.
  I've never completely gone unconscious and I do notice that if I sit down
  right away or hang onto something, it will go away.
  Thanks for your help on this question.
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Dear  Ange,
Thank you for your question.  As you can see by scrolling through this site we get many questions regarding tachycardia and palpitations.  J-point depression describes the position of the terminal portion of the QRS complex and is not a significant finding.
In regard to your tachycardia there are many causes of tachycardia and they can be divided roughly into sinus (originating from the sinus node or heart