Protective effect of PEMF on I/R rats in vivo. Plasma myocardial enzymes (LDH, CK, HBDH and CKMB) content was quantified by automatic biochemical analyzer (A) (n=18 in each group). Changes on cardiac cell morphology via TEM (B) (n=6 in each group). TTC-Evans Blue staining for MI area (C). Statistical analysis of the effect of PEMF in reducing infarct size in a rat model of I/R (D). Data were represented as the mean ± S.E.M.