SDN Members don't see this ad. (About Ads) I'm hoping to get some input on what others are doing with regard to short acting spinals (1 - 2 hours) for knee scopes, GU, etc... I'm getting pressure from my partners to stop using lidocaine for fear of TNS. I have limited experience with chlorprocaine and mepivicaine. I've found cutting back on the bupivicaine dose still gives a pretty lasting block. Any advice? Thanks.