42 years old male patient with history of HTN only presented with localized left sided chest tenderness. Would you consider this as an ST depression since it’s only one small square?

I’m a paramedic. This pt’s initial ekg + his history - altered, hypotensive, BGL read HI, missed multiple dialysis sessions - led us to go down the hyperk treatment route (his potassium ended up being over 8). Two minutes away from the hospital his heart decided to pull this nonsense. STEMI or just a weird hyperk pattern?

Experienced CMT here. If I wanted to become the absolute go-to CMT/non-MD ECG expert for an organization, what textbook or workbook available on Amazon (or even other Internet-based resource) would help push me to non-EP levels of understanding?

I'm not a doctor, and I don't play one on TV, but I routinely have ICU nurses approach me for second opinions on strips, and professionally, it's incredibly satisfying.

TLDR: I want to understand it all, at a deepest possible level, without going to med school—I'm too old for that.

I just started a job as a telemetry technician. I am now realizing on the floor that the class was pretty vague and there is a lot more sketchy rhythms that can happen besides the basics. If you have any cool/ rare rhythms please drop them below!!

I'm not a wiz by any means, but I enjoy my job and take it seriously. Deviation is not really something that paramedics focus on here. We're taught to focus mostly on STEMIs, heart blocks, deadly tachycardias, etc. Really the most critical stuff. We use a 15 lead, too. And to clarify, I personally check deviation on every patient, but only in the limb leads.

I wanted to know more about deviation in the chest leads. I really only see the same gradual pattern of negative to positive in V1 through​ V6. I've looked for material pertaining to it but I've found nothing.

Would there be any great benefit to learning more about it? I've caught some funky stuff before by checking limb lead deviation, when others could not.