Statistical analysis
SD
The sample size was calculated by PASS (V.11) software. This study is a parallel randomized controlled study, and the primary outcome is the level of cTnT on POD2. Previous measurements in patients after cardiac surgery in our institution had an average cTnT level of 0.5 ± 0.25 μg/L on POD2. With 60 patients in each group undergoing randomization after screening, we estimated that the trial would have a 30% reduction in the cTnT with 90% power (type II error probability 0.1), and at a two-sided The IBM SPSS statistical software (Statistics for Windows, version 25, IBM Corporation, Armonk, NY, USA) and R software (Version: 4.2.2) were used for analysis. Continuous variables were presented as the mean ± SD or, if appropriate, as the median with interquartile ranges (IQR). Discrete variables are depicted as frequencies (