Randomization and blinding
STERILE, SEPARATION
Patients were randomly assigned to receive AR or BR solution at a 1:1 ratio. The patients, anaesthetists and outcome adjudicators were blinded to the intervention assignment. Patients were assessed by a single investigator, and eligible patients were enrolled. When the patients entered the operating room, the second researcher opened a sealed envelope and carried out infusion and lavage according to the grouping. The anaesthesiologists were blinded to the allocated intervention by sterile curtain separation. Two other researchers collected the experimental data.