Experimental setting and serum cardiac troponin T (cTnT) concentrations in control and RIPC patients. RIPC was performed by 4 cycles of 5 minutes of upper arm ischemia induced with a blood pressure cuff. Each cycle of ischemia was followed by 5 minutes of reperfusion. Cardiac biopsies were obtained before and after CPB (A). cTnT levels were evaluated at ICU admission in the control and RIPC group (B). Bars denote SEM; ***, P < 0.001. cTnT, cardiac troponin T; CPB, cardiopulmonary bypass; ICU, intensive care unit; RIPC, remote ischemic preconditioning.