Blinding
In this study, participants, the assessor of the study variables, and the analyst were blinded.Patients were selected according to the inclusion and exclusion criteria and randomly allocated to two groups of p and v using the randomly permuted blocks method. For this method, a table of 50 sequences of groups A and B was presented by consulting with a statistical consultant and using software (block number 13 and block size of 4). To ensure the concealment, each letter was placed in a sealed envelope. After closing each envelope, they were numbered based on the initial table. After selecting the eligible patient for the study, the envelope corresponding to the patient was opened, and based on the letters inside, the patient was assigned to one of two groups. The statistical consultant determined random sequence allocation. The first researcher enrolled the participants. According to the letters in each envelope written based on the specified sequence, participants were assigned to the intervention by an anesthesiologist. Data were collected and recorded by a trained individual blinded to the type of intervention performed during anesthesia (Fig. 
CONSORT flow diagram