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Cardiac troponin enzyme, creatine kinase-myocardial bound, fentanyl requirements, extubation time and length of intensive care unit stay of the studied groups. Data are presented as mean ± standard deviation. Group P: Propofol group; Group PD: Propofol dexmedetomidine group. (T1): basally; (T2): 15 min after unclamping of the aorta; (T3): Immediate postoperative; (T4): 24 h' postoperative
