At the surgeon's discretion, the cuff pressure may be increased or decreased at any time during the procedure, with SBP, time, and the reason for change recorded. Immediately following the end of the procedure, the surgeon (principal investigator) will rate the overall quality of the surgical field using a visual analogue scale. He will also be provided with an area to comment on visualization capabilities during specific aspects of the procedure or any difficulties that may have occurred. Tourniquet inflation time and variation in SBP taken from the anaesthetists chart will be recorded. Incidence of post operative neurapraxias will also be determined.