Sounds like a Left Ventricular Assist Device (LVAD). Interestingly enough, with the older implants there is no detectable heartbeat under a stethoscope due to the way the pump functions. Pretty surprising when you’re expecting to find one, and has led to it being unoficially dubbed VLAD in reference to the creatures of the night.

I think wl-screenrec can do that, it has a “shadowcopy” like function with the ‘–history’ flag. Wayland only and not sure if it works on GNOME or KDE though as I was using it with hyprland.