Myocardial injury in rats subjected to cardiopulmonary bypass (CPB) with different treatments (n = 8/group).

Values presented are mean±SEM. A: serum cardiac troponin I (cTnI) level. B: serum lactate dehydrogenase (LDH) level. G, ghrelin; GI, [D-Lys3]-GHRP-6, ghrelin inhibitor; W, wortmannin, a PI3K inhibitor. **P<0.01 vs. Sham, ##P<0.01 vs. CPB, δδP<0.01 vs. CPB+G.