Requests for additional analgesia (Optalgin, etc) will be assessed. During the 30 minutes following the entry to recovery room the patients will be asked if they are experiencing any of a number of the symptoms used by the list of adverse events and their responses will noted in their records. All the patients will be warned of potentially serious complications requiring immediate evaluation (e.g. progressive weakness). To examine delayed adverse events the patients will be asked to select any of a number of the symptoms used by the list of adverse events for up to 72 hours after the procedure (the patients will be asked to bring the completed lists of the symptoms to their follow up visit in 1 month after a procedure). All patients will be seen at a follow-up appointment with their pain treating physician in the Pain Department of Tel HaShomer in 1, 2 and 3 months following the procedure.