You know how sometimes you learn about something and suddenly you can't stop seeing every instance of it being done completely wrong? Yeah, that's me and ECGs right now. I've learned the structure of a normal ECG output, and so now I can't see (incorrect) fictional ECG output without going "Wait a second, that's not how those work!"
Now, that said, it does seem similar to the ECG output corresponding to 3rd degree heart block (shown below). Something tells me, though, that the game devs didn't do that on purpose and kinda just drew what they thought a heartbeat looks like.