Thanks for the mention @amandajro.
Hi @iowafemale, I have one of the older Series 2 Apple iWatch's and I bought one of the Kardia ECG pads when they first came out. After I had it a few months and had been taking an ECG along with my blood pressure every morning. I have hypertension and do take blood pressure medication but had really never been concerned with Afib or arrhythmias until one morning on a weekend the app popped up with an possible Afib reading. I had some anxiety and called my healthcare insurer who have a nurse hotline for questions. She told me to have someone take me to the emergency room. Being a guy and feeling OK, I decided to wait and took the ECG a couple of more times. The Afib reading went away but it showed "unclassified" reading so I didn't go in and decided to mention it to my Mayo doctor at my next appointment a few weeks away. I gave him my phone and he talked with a cardiologist and mentioned it looks more like PVCs and thought it wasn't something to worry about. They both agreed it wasn't Afib so that made me feel a lot better but a little questioning about my Apple watch and the Kardia device.
Then I started thinking about my different health conditions and one being peripheral neuropathy. I use my fingers on the pads for the ECG and the thumb on the Kardia watch band I also have and both rely on the nerves (I think) in my fingers which are probably not that great. I think your Samsung watch with the ECG may have cleaner readings than my older iWatch but I still think they both will only be a possible indicator and the doctor/cardiologist is the one that can do the interpretation if a regular ECG is needed. Possibly it all boils down to one lead into the electronics for recording?…but that's just an uneducated guess 🙂 My Apple watch has been showing me Afib readings for a couple of years now but they are interspersed with normal and unclassified readings. I've been thinking of getting a new Series 4 Apple watch which probably is similar to the Samsung in how they work, not needing the small pad for the fingers.