 All patients will receive the same amount of spinal solution, containing chloroprocaine 1 4 ml with dexmedetomidine 0.5 ml, 1 mcgml or NaCl sodiumchloride 0,9 0.5 ml and 50 ml intravenous Nacl 0.9, containing dexmedetomidine 0.5 mcgkg or not depending on the study group. All solutions are prepared by an independent anesthesiologist and labelled as Intravenous study medication and spinal study medication. Spinal anesthesia and data registration will be done by a blinded anesthesist andor study nurse on a data sheet designed for the study. 