Fig. 4.

A: ΔT vs. ΔST in a human preconditioning study with two subsequent occlusions. In line with observations from porcine simulation and canine experiments, a significant increase in ΔT vs. ΔST is observed in occlusion 2 compared with occlusion 1 during human preconditioning (P = 0.02). B: example ECGs of two subsequent occlusions are presented below. There is a more rapid increase in ΔT/ΔST during the second occlusion compared with the first occlusion. Although the R wave increases in occlusion 1 in this particular example, which was not the case during occlusion 2, this pattern of R wave change was not uniform throughout all patients.