Randomization
BLIND
To conduct the randomization, we firstly selected eight CCU wards as eight separate strata. Then, using a statistical software and eight separate strata, we prepared a list of random allocation for 80 subjects. A statistician who was not a member of the research team generated the list and made sequentially numbered containers. Then, based on the random sequence that was prepared, the researcher assistant opened the containers sequentially, and the eighty patients under PCI were randomly divided into the intervention and control groups. Allocation concealment that prevents selection bias was implemented through a randomization for allocation to the two groups; we kept the random allocation sequence in a locked numbered containers, so the statistician and outcomes assessors were blind.