When a clinician looks at an EKG, they can depict a STEMI, arrhythmias, and so much more. However, as a non-clinician, when I look at an EKG, I see an electrical circuit built up of many components where the heart is central power unit.
For many years, I helped develop and build data acquisition systems for a neuro-focused company. I've found that this experience has given me a slightly different perspective of what is going on under the hood of an EKG than your average layperson or even clinician.