No doubt he had something to do with Grievous still being alive after his ship was blown up. Granted he's mostly machine, but he's still alive. Same with Vadar. When Anakin was burned and lying by the lava pit, Sideous did the 6 Million Dollar Sith operation on him and he was able to live. Even though Anakin's pure hate at that point kept him alive for so long, ultimately he would have died had Sideous not shown up to save him.
That being said, when Anakin choked Padme (and that's still the excuse I'm going with for why she died, not the broken heart story), she died on the delivery table as a result. Once he came to in full Vadar gear, and the Emperor informed him that he killed her, the Emperor had not broken his promise. I think the whole time he was being truthful in a sense. Saving her life would have meant making her into a machine, but it was truthful nonetheless. But then again, had he not been brought over to the dark side, Padme wouldn't have died in the first place.
I could be way off, but that's how I took it.