3. Need for another anaesthetic technique during the course of surgery.

study	spinal	operating time	epidural	operating time	reason for change
Lertakyamanee	9 patients to general anaesthesia	63.1 + 19.3 minutes	6 patients to general anaesthesia	69.1 + 19.3 minutes	The randomised technique could be changed at the anaesthetist's consideration but the reasons why were specified.