Krebs-Henseleit buffer solution (pH 7.4): NaCl 118 mmol/L, KCl 4.8 mmol/L, MgSO_4 1.2 mmol/L, KH2P04 1.2 mmol/L, NaHCO_3 25 mmol/L, glucose 11 mmol/L. METHODS: Open chest operation was performed on the anesthetized rats to take out their hearts.

• Krebs-Henseleit缓冲液(pH7.；4)：NaCl 118mmol，L，KCl4