The randomization process was performed using computer-generated random tables in a 1:1 ratio. Patients were randomly assigned to the study groups on the day of the surgery, once the patient signs the informed consent for participation in the study. We randomly assigned patients to one of our treatment groups by means of stratified-blocked randomization across two strata derived from predetermined size grouping (30-55ml and 55-80ml) and two strata derived from preoperative medication (alpha blockers vs. non alpha blockers user).