Preconditioning Against Renal Damage Under Contrast Examination (Re-DUCE-F)

This study aims to assess if applying an ischaemic insult to an arm before giving intravenous contrast will help decrease the incidence of developing contrast induced acute renal injury in patients undergoing contrast-enhanced CT Scans. The main research question is 'In adult in-patients undergoing contrast-enhanced CT scans, does remote ischaemic pre-conditioning (RIPC) induced by brief arm ischaemia and reperfusion, when compared to control, reduce the proportion of patients developing contrast-induced acute kidney injury in the first 3 post-scan days? '