Question
for chronic upper back pain, what would be the "standard" settings on tens unit for the following:
pulse width (40-260)
pulse rate (2-120)
thanks.

Answer
Dear Petrina Rodriguez,

Thank you for your question.

My expertise is in a modern form of chiropractic, termed straight chiropractic or, more accurately, non-therapeutic straight chiropractic, which does not rely on TENS units or other related modalities.  Such things simply have no place in my professional work.  

I would be glad to offer my comments on your situation from a non-therapeutic straight chiropractic viewpoint but I will suggest you ask others who choose to use the TENS modality about its use.  

Sincerely,
James W. Healey, DC