CONCLUSIONS	These results suggest that the use of a low dose of bupivacaine ( 5 mg ) added to fentanyl ( 25 microg ) for endoscopic urological surgery , resulted in short-acting sensory block , without motor block and a lower incidence of cardiovascular side effects , as compared to either of 7.5 or 10 mg bupivacaine with 25 microg fentanyl .\