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cTnI expression levels preoperatively (T1), and at 6 h (T2), 12 h (T3) and 24 h (T4) after surgery. **P<0.01 vs. the preoperative level in the sevoflurane group; ##P<0.01 vs. the preoperative level in the propofol group. No significant difference was observed between the two groups at T3 and T4. Data are presented as the mean ± standard deviation. cTnI, cardiac troponin I; NS, not significant.
