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Myocardial β1‐adrenergic receptor (AR) expression at 4 hours after return of spontaneous circulation in 4 groups (note: except the normothermic control group containing 7 rats, the other groups have 8 rats each). *P<0.05 vs the normothermic epinephrine group. # P<0.05 vs the normothermic control group. ^ P<0.05 vs the sham group.
