Thanks for writing in.
I am a qualified and certified cardiologist. I read your mail with diligence. New ST changes with T inversion your doctor is quite justified in suspected ischemia
. A nuclear scan is good test however it has specificity is in the range of 80%. If insurance company is refusing pre-authorisation, the decision is questionable. Only test with higher specificity then is coronary angiography
which will tell with 100 certainty the cause of ischemia. It is different matter in some cases we have to do a Treadmill Test or Radionuclide
scintography before taking final decision of restoring the blood supply should your arteries show disease. Good luck.
With Best Wishes
Dr Anil Grover,
Medical Specialist & Cardiologist
M.B.;B.S, M.D. (Internal Medicine) D.M.(Cardiology)