I had a very scary day. My heart rate went to 180ish with jaw pain and it was at 130-150 for hours. Went to hospital and they did a cardiac enzymes test 6 hours after I'd had the 180 episode. My troponin level was 7 (normal was listed as 3-14; pretty sure this was troponin I). But I thought it was really supposed to be undetectable; pretty sure it has been every time before. So now I'm very scared, especially when they didn't do a repeat later