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Objective:To observe the cardioprotective effect of hyperkalemic cardioplegic solution enriched with either mitochondrial permeability transition pore inhibitor or potassium channel openers on rabbit immature heart subjected ischemia.Methods:Forty-five immature rabbit hearts were randomly divided into 5 groups.After control perfusion in modified Langendorff mode with Krebs-Henseleit bicarbonate buffer for 20 minutes,the isolated immature rabbit hearts were infused with 20ml different cardioplegia.