@rice Okay, that all sounds reasonable. Yes, I would get a second opinion AND assessment if possible (different machines, different techs/operators, different interpreters of the data, etc).

What the cardiologists first think of is ischemia...low blood supply with oxygen which makes some organs suffer....chiefly the heart. The ischemia might be from blockages or it could be from low BP due to cardiac insufficiency, or even from a prolapsed or stenosed mitral, tricuspid, or aortal valve. These can all happen, and they all affect the heart's needed output. So, the treadmill stress test can show if there is ischemia, but not pinpoint its cause or location. For that you need the contrast with dye or you need an angiogram. BTW, I had to endure two MIBI stress tests, both with dye and CT scans, plus my EP ordered an MRI and an angiogram. With no indications from either test that I have ischemia, the EP felt better about me as a candidate for cathter ablation.