What you mean EKG revealed LBBB. Going through your drug list it seems that you have Hypertension
and increased cholesterol
(both are risk factors for coronary artery
disease). If the previous EKG (I assume it was done before) had not shown LBBB then this becomes recent onset LBBB with positive stress thallium. That is an indication to exclude underlying coronary artery disease. The test which can confirm or exclude it with 100% certainty and without exposing you to unnecessary radiation
is coronary arteriography. Personally, I believe CT angiography
does not have any superiority over conventional coronary angiography. I will therefore, recommend the conventional procedure.
With Best Wishes
Dr Anil Grover