Peter Gamma from www.petergamma.org is very interested in ECG devices. He has written 525 pages about it on his site:

https://petergamma.org/category/ecg-devices

The best paper he could find about this topic in the web is from Canadian scientists published in Helyon:

https://www.cell.com/heliyon/pdf/S2405-8440(21)01251-2.pdf

Helyon is not „the Journal of Physiology“, but it is at least, www.cell.com. And it is not just WordPress or YouTube. Aren t many of the projects we find there just a waist of time, since most of them are buggy? So if you are a really serious developer at the Swiss quality level, find your information at university libraries like this one:

https://infozentrum.ethz.ch/en

And nowhere else. It seems that Peter Gamma from www.petergamma.org

has to start from scratch. And he will only study instructions in papers at the highest level in the future:

as he did earlier in his scientific career.