ICD/CRT-D: Inappropriate shocks

Does anyone know the real statistics on how many people get inappropriate shocks from their ICD/CRT-D?   I’ve been reading a LOT of stories on here where people are getting multiple inappropriate shocks and the idea of that is just terrifying to me.  Is there anything I can do or should ask about in order to minimize this risk?  I’ve read something about SmartShock Technology – does anyone have any experience with this? Do all CRT-D devices have this technology or do you have to ask for it?

I have been getting short runs of VTach as well as frequent PVCs.   Does the CRT-D just send out little pulses to stop the VT and PVCs?   I assume I would not feel those?   Or by pacing the 2 ventricles does the CRT-D eliminate the possibility of getting runs of VT and PVCs?   How do they program it to deliver an actual shock – when your heartrate gets above a certain number?