When I had my cardioversion yesterday, the first cannula was put in incorrectly (gosh did it hurt). Instead of the general anaesthetic going into my vein it gushed down my hand. Someone quickly inserted another and that was fine. However the back of my hand is really swollen, red and painful now. There's obviously some sort of infection there and it's too painful to use. Has anyone else experienced this? At what stage should I contact my GP as it appears to be getting worse, or do I just put up with it?