I had passed out a couple times and they ran me through quite a few tests without finding the reason. I wore a holter monitor for awhile, first, then they decided implanting the loop recorder would be better for longer term monitoring. It is did its job as the next time I passed out, it showed the 15 seconds of “pause” dx 3rd degree heart block and the need for a PM! The loop recorder and PM both Medtronic and I use the app on my phone for monitoring.
The loop recorder is implanted under the chest skin, is about 1.5 inch, and is a continuous heart recorder. (It does not pace or shock.)