There was an old pulpy SF novel named Killobyte(sic) with the premis being a VR that gave increasingly (with each death) intense electric shocks as for death to

There was an old pulpy SF novel named Killobyte(sic) with the premis being a VR that gave increasingly (with each death) intense electric shocks as for death to increase the realism. MC was someone who didn't read the warning labels and has a pacemaker. If they die the third time it will potentially damage their pacemaker and kill them.